{"id":375,"date":"2023-07-09T20:01:07","date_gmt":"2023-07-09T12:01:07","guid":{"rendered":"https:\/\/www.escook.cn\/?p=375"},"modified":"2023-09-26T21:03:59","modified_gmt":"2023-09-26T13:03:59","slug":"vue3-%e5%9f%ba%e7%a1%80-%e8%ae%a1%e7%ae%97%e5%b1%9e%e6%80%a7-%e4%be%a6%e5%90%ac%e5%99%a8-%e6%a0%b7%e5%bc%8f%e7%bb%91%e5%ae%9a-%e6%a8%a1%e6%9d%bf%e5%bc%95%e7%94%a8","status":"publish","type":"post","link":"https:\/\/www.escook.cn\/index.php\/2023\/07\/09\/vue3-%e5%9f%ba%e7%a1%80-%e8%ae%a1%e7%ae%97%e5%b1%9e%e6%80%a7-%e4%be%a6%e5%90%ac%e5%99%a8-%e6%a0%b7%e5%bc%8f%e7%bb%91%e5%ae%9a-%e6%a8%a1%e6%9d%bf%e5%bc%95%e7%94%a8\/","title":{"rendered":"Vue3 \u57fa\u7840 \u2013 \u8ba1\u7b97\u5c5e\u6027 & \u4fa6\u542c\u5668 & \u6837\u5f0f\u7ed1\u5b9a & \u6a21\u677f\u5f15\u7528"},"content":{"rendered":"
\n

\u7248\u6743\u5f52\u4f5c\u8005 \u00a9\u5218\u9f99\u5bbe<\/strong> \u6240\u6709\uff0c\u672c\u6587\u7ae0\u672a\u7ecf\u4f5c\u8005\u5141\u8bb8\uff0c\u7981\u6b62\u79c1\u81ea\u8f6c\u8f7d\uff01<\/p>\n<\/blockquote>\n

1. setup \u51fd\u6570 & \u7ec4\u5408\u5f0f API<\/h1>\n

\u5728\u524d\u9762\u7684\u8bfe\u7a0b\u4e2d\uff0c\u6211\u4eec\u66fe\u5f3a\u8c03\u8fc7\uff1a\u4f7f\u7528 data()<\/code> \u51fd\u6570\u58f0\u660e\u54cd\u5e94\u5f0f\u7684\u6570\u636e\u3001\u5728 methods<\/code> \u8282\u70b9\u4e0b\u58f0\u660e\u4e8b\u4ef6\u5904\u7406\u5668\uff0c\u90fd\u662f Vue2 \u4e2d\u7684\u65e7\u8bed\u6cd5\uff08\u9009\u9879\u5f0fAPI<\/strong>\uff09\u3002\u8fd9\u79cd\u65e7\u8bed\u6cd5\u7684\u5b58\u5728\uff0c\u4e3b\u8981\u662f\u4e3a\u4e86\u9632\u6b62\u65ad\u5d16\u5f0f\u5347\u7ea7<\/strong>\u9020\u6210\u7684\u8001\u7528\u6237\u6d41\u5931\u3002<\/p>\n

\u5728 Vue3 \u4e2d\uff0c\u63a8\u51fa\u4e86\u7ec4\u5408\u5f0f API<\/strong> \u7684\u65b0\u6982\u5ff5\uff0c\u5b83\u53ef\u4ee5\u6781\u5927\u63d0\u9ad8\u529f\u80fd\u6a21\u5757\u7684\u5c01\u88c5\u6027<\/strong>\u548c\u590d\u7528\u6027<\/strong>\u3002\u56e0\u6b64\uff0c\u5b98\u65b9\u63a8\u8350\u6240\u6709\u7528\u6237\u4f18\u5148\u4f7f\u7528\u7ec4\u5408\u5f0f API\u3002<\/p>\n

\u5728\u4eca\u540e\u7684\u5f00\u53d1\u4e2d\uff0c\u4e3a\u4e86\u7ef4\u62a4\u8001\u9879\u76ee\uff0c\u6211\u4eec\u53ef\u80fd\u4f1a\u4e0d\u5f97\u4e0d\u7528\u5230\u9009\u9879\u5f0f API\u3002\u9664\u6b64\u4e4b\u5916\uff0c\u5728\u5f00\u53d1\u65b0\u9879\u76ee\u65f6\uff0c\u63a8\u8350\u5927\u5bb6\u4f18\u5148\u4f7f\u7528\u7ec4\u5408\u5f0f API\u3002<\/p>\n

1.1 setup \u51fd\u6570<\/h2>\n

setup()<\/code> \u51fd\u6570\u662f Vue3 \u4e2d\u7ec4\u5408\u5f0f API \u7684\u5165\u53e3\uff0c\u5b83\u7684\u8bed\u6cd5\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n

const { createApp } = Vue\n\nconst app = createApp({\n  setup() {\n    \/\/ \u7ed9\u6a21\u677f\u4f7f\u7528\u7684\u6570\u636e\u3001\u4e8b\u4ef6\u5904\u7406\u5668\u7b49\uff0c\u90fd\u8981\u901a\u8fc7\u8fd9\u4e2a return \u7684\u5bf9\u8c61\u66b4\u9732\u7ed9\u6a21\u677f\n    return {}\n  }\n})\n\napp.mount('#app')<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u5728 setup<\/code> return \u7684\u5bf9\u8c61\u4e2d\uff0c\u58f0\u660e\u4e00\u4e2a\u6570\u636e name<\/code>\uff1a<\/p>\n
const { createApp } = Vue\n\nconst app = createApp({\n  setup() {\n    \/\/ \u7ed9\u6a21\u677f\u4f7f\u7528\u7684\u6570\u636e\u3001\u4e8b\u4ef6\u5904\u7406\u5668\u7b49\uff0c\u90fd\u8981\u901a\u8fc7\u8fd9\u4e2a return \u7684\u5bf9\u8c61\u66b4\u9732\u7ed9\u6a21\u677f\n    return {\n      name: 'liulongbin'\n    }\n  }\n})\n\napp.mount('#app')<\/code><\/pre>\n
\u7d27\u63a5\u7740\uff0c\u5728\u6a21\u677f\u4e2d\u5373\u53ef\u4f7f\u7528\u540d\u4e3a name \u7684\u6570\u636e\u4e86\uff1a<\/p>\n
<!-- \u6a21\u677f -->\n<div id="app">\n  <h1>{{ name }}<\/h1>\n<\/div><\/code><\/pre>\n
\n
\u6ce8\u610f\uff1a\u521a\u624d\u5b9a\u4e49\u7684 name\uff0c\u5e76\u975e\u662f\u54cd\u5e94\u5f0f\u7684\u6570\u636e\uff0c\u6240\u4ee5\u57fa\u4e8e app._instance.proxy.name \u4fee\u6539\u5b83\u7684\u503c\u540e\uff0c\u4e0d\u4f1a\u89e6\u53d1\u89c6\u56fe\u7684\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<\/blockquote>\n
1.2 \u7ec4\u5408\u5f0f API<\/h2>\n
\u7ec4\u5408\u5f0f API \u662f Vue3 \u63d0\u4f9b\u7684\u4e00\u7cfb\u5217\u51fd\u6570\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528 reactive()<\/code> \u548c ref()<\/code> \u8fd9\u4e24\u4e2a\u51fd\u6570\uff0c\u6765\u58f0\u660e\u54cd\u5e94\u5f0f\u7684\u6570\u636e\u3002<\/p>\n
1. reactive \u51fd\u6570<\/h3>\n
reactive \u51fd\u6570\u7528\u6765\u5b9a\u4e49\u54cd\u5e94\u5f0f\u7684\u6570\u636e\u5bf9\u8c61\uff0c\u5b83\u7684\u4f7f\u7528\u6b65\u9aa4\u5982\u4e0b\uff1a<\/p>\n
\/\/ 1. \u4ece Vue \u4e0a\u89e3\u6784\u51fa reactive \u51fd\u6570\nconst { createApp, reactive } = Vue\n\nconst app = createApp({\n  setup() {\n    \/\/ 2. \u8c03\u7528 reactive \u51fd\u6570\uff0c\u5b9a\u4e49\u54cd\u5e94\u5f0f\u7684\u6570\u636e\n    const user = reactive({ name: 'zs' })\n\n    \/\/ 3. \u628a\u54cd\u5e94\u5f0f\u7684\u6570\u636e\uff0c\u6302\u8f7d\u5230 return \u7684\u5bf9\u8c61\u4e0a\uff0c\u4f9b\u6a21\u677f\u4f7f\u7528\n    return {\n      user\n    }\n  }\n})\n\napp.mount('#app')<\/code><\/pre>\n
\u63a5\u4e0b\u6765\uff0c\u5c31\u53ef\u4ee5\u5728\u6a21\u677f\u4e2d\u4f7f\u7528\u54cd\u5e94\u5f0f\u7684\u6570\u636e user<\/code> \u5566\uff1a<\/p>\n
<!-- \u6a21\u677f -->\n<div id="app">\n  <h1>{{ user.name }}<\/h1>\n<\/div><\/code><\/pre>\n
2. \u4fee\u6539 reactive \u6570\u636e<\/h3>\n
\u5982\u679c\u60f3\u8981\u70b9\u51fb\u6309\u94ae\uff0c\u4fee\u6539 user.name<\/code> \u7684\u503c\uff0c\u6211\u4eec\u53ef\u4ee5\u5728 setup<\/code> \u4e2d\u5b9a\u4e49\u4e8b\u4ef6\u7684\u5904\u7406\u51fd\u6570\uff0c\u5e76\u6302\u8f7d\u5230 return \u7684\u5bf9\u8c61\u4e0a\uff0c\u4f9b\u6a21\u677f\u4f7f\u7528\uff1a<\/p>\n
setup() {\n  const user = reactive({ name: 'liulongbin' })\n\n  \/\/ 1. \u5b9a\u4e49\u5904\u7406\u51fd\u6570\n  const changeUserName = () => {\n    user.name = 'escook'\n  }\n\n  return {\n    user,\n    \/\/ 2. \u628a\u5904\u7406\u51fd\u6570\uff0c\u66b4\u9732\u7ed9\u6a21\u677f\u4f7f\u7528\n    changeUserName\n  }\n}<\/code><\/pre>\n
\u6700\u540e\uff0c\u5728\u6a21\u677f\u4e2d\uff0c\u4e3a <button><\/code> \u6309\u94ae\u7ed1\u5b9a\u70b9\u51fb\u4e8b\u4ef6\uff1a<\/p>\n
<!-- \u6a21\u677f -->\n<div id="app">\n  <h1>{{ user.name }}<\/h1>\n  <!-- 3. \u7ed1\u5b9a\u4e8b\u4ef6\u5904\u7406\u5668 -->\n  <button @click="changeUserName">\u6309\u94ae<\/button>\n<\/div><\/code><\/pre>\n
\n
reactive \u51fd\u6570\u7684\u7f3a\u70b9\uff1a\u53ea\u80fd\u4e3a\u5f15\u7528\u7c7b\u578b\u7684\u6570\u636e\u521b\u5efa\u54cd\u5e94\u5f0f\u6570\u636e\u5bf9\u8c61\uff0c\u65e0\u6cd5\u5c06\u503c\u7c7b\u578b\u7684\u6570\u636e\u8f6c\u5316\u4e3a\u54cd\u5e94\u5f0f\u6570\u636e\u3002<\/p>\n<\/blockquote>\n
3. ref \u51fd\u6570<\/h3>\n
ref \u51fd\u6570\u7528\u6765\u5c06\u503c\u7c7b\u578b\u7684\u6570\u636e\u8f6c\u5316\u4e3a\u54cd\u5e94\u5f0f\u6570\u636e\uff0c\u5b83\u7684\u57fa\u672c\u7528\u6cd5\u5982\u4e0b\uff1a<\/p>\n
\/\/ 1. \u4ece Vue \u4e2d\u7ed3\u6784\u51fa ref \u51fd\u6570\nconst { createApp, ref } = Vue\n\nconst app = createApp({\n  setup() {\n    \/\/ 2. \u8c03\u7528 ref \u51fd\u6570\uff0c\u521b\u5efa\u54cd\u5e94\u5f0f\u6570\u636e count\uff0c\u5176\u521d\u59cb\u503c\u4e3a 0\n    const count = ref(0)\n\n    return {\n      \/\/ 3. \u628a\u54cd\u5e94\u5f0f\u6570\u636e count\uff0c\u66b4\u9732\u7ed9\u6a21\u677f\u4f7f\u7528\n      count\n    }\n  }\n})\n\napp.mount('#app')<\/code><\/pre>\n
\u7d27\u63a5\u7740\uff0c\u5c31\u53ef\u4ee5\u5728\u6a21\u677f\u4e2d\u4f7f\u7528 count \u4e86\uff1a<\/p>\n
<!-- \u6a21\u677f -->\n<div id="app">\n  <h1>{{ count }}<\/h1>\n<\/div><\/code><\/pre>\n
4. \u4fee\u6539 ref \u6570\u636e<\/h3>\n
\u5982\u679c\u60f3\u8981\u70b9\u51fb\u6309\u94ae\uff0c\u4fee\u6539 count<\/code> \u7684\u503c\uff0c\u5219\u9700\u8981\u5728 setup<\/code> \u51fd\u6570\u4e2d\u5b9a\u4e49\u4e8b\u4ef6\u7684\u5904\u7406\u51fd\u6570\uff0c\u5e76\u6302\u8f7d\u5230 return \u7684\u5bf9\u8c61\u4e0a\uff0c\u4f9b\u6a21\u677f\u4f7f\u7528\uff1a<\/p>\n
setup() {\n  const count = ref(0)\n\n  \/\/ 1. \u5b9a\u4e49\u5904\u7406\u51fd\u6570\uff08\u6ce8\u610f\uff1a\u5728 js \u4e2d\u5fc5\u987b\u4f7f\u7528 .value \u6765\u8bbf\u95ee ref \u58f0\u660e\u7684\u54cd\u5e94\u5f0f\u6570\u636e\uff09\n  const increase = () => {\n    count.value++\n  }\n\n  return {\n    count,\n    \/\/ 2. \u628a\u5904\u7406\u51fd\u6570\uff0c\u66b4\u9732\u7ed9\u6a21\u677f\u4f7f\u7528\n    increase\n  }\n}<\/code><\/pre>\n
\u6700\u540e\uff0c\u5728\u6a21\u677f\u4e2d\uff0c\u4e3a <button><\/code> \u6309\u94ae\u7ed1\u5b9a\u70b9\u51fb\u4e8b\u4ef6\uff1a<\/p>\n
<!-- \u6a21\u677f -->\n<div id="app">\n  <h1>{{ count }}<\/h1>\n  <!-- 3. \u7ed1\u5b9a\u4e8b\u4ef6\u5904\u7406\u5668 -->\n  <button @click="increase">+1<\/button>\n<\/div><\/code><\/pre>\n
\n
\u6ce8\u610f\uff1a\u4f7f\u7528 ref \u58f0\u660e\u7684\u54cd\u5e94\u5f0f\u6570\u636e\uff0c\u5728 js \u4e2d\u5fc5\u987b\u4f7f\u7528 .value \u8fdb\u884c\u8bbf\u95ee\u3002\u5728\u6a21\u677f\u4e2d\u4e0d\u5fc5\u4f7f\u7528 .value \u8fdb\u884c\u8bbf\u95ee\uff0c\u56e0\u4e3a\u5728\u6a21\u677f\u4e2d\u4f7f\u7528\u65f6\u4f1a\u81ea\u52a8\u5bf9 ref \u6570\u636e\u8fdb\u884c\u89e3\u5305\u3002<\/p>\n<\/blockquote>\n
5. \u5c06\u5bf9\u8c61\u8d4b\u503c\u7ed9 ref<\/h3>\n
ref \u51fd\u6570\u9664\u4e86\u63a5\u6536\u503c\u7c7b\u578b<\/strong>\u7684\u6570\u636e\u4e4b\u5916\uff0c\u8fd8\u53ef\u4ee5\u5c06\u5bf9\u8c61\u7c7b\u578b\u7684\u6570\u636e<\/strong>\u8f6c\u5316\u4e3a\u54cd\u5e94\u5f0f<\/strong>\u6570\u636e\u3002\u4f8b\u5982\uff1a<\/p>\n
setup() {\n  \/\/ 1. \u628a\u5bf9\u8c61\u8d4b\u503c\u7ed9 ref \u4f5c\u4e3a\u521d\u59cb\u503c\n  const info = ref({ name: 'liulongbin', age: 18 })\n\n  \/\/ 2. \u5b9a\u4e49\u5904\u7406\u51fd\u6570\n  const changeInfo = () => {\n    \/\/ \u901a\u8fc7 info.value \u5206\u522b\u4e3a\u6bcf\u4e2a\u5c5e\u6027\u8d4b\u503c\n    info.value.name = 'escook'\n    info.value.age = 22\n\n    \/\/ \u76f4\u63a5\u7ed9 info.value \u8d4b\u65b0\u503c\n    \/\/ info.value = { name: 'escook', age: 22 }\n  }\n\n  \/\/ 3. \u5411\u6a21\u677f\u66b4\u9732\u6570\u636e\n  return {\n    info,\n    changeInfo\n  }\n}<\/code><\/pre>\n
\u5728\u6a21\u677f\u4e2d\uff0c\u76f4\u63a5\u4f7f\u7528 info<\/code> \u5373\u53ef\uff0c\u56e0\u4e3a\u6a21\u677f\u4e2d\u4f1a\u5bf9 ref \u6570\u636e\u81ea\u52a8\u89e3\u5305\uff1a<\/p>\n
<!-- \u6a21\u677f -->\n<div id="app">\n  <h1>{{ info.name }}\u4eca\u5e74{{info.age}}\u5c81\u4e86\u3002<\/h1>\n  <button @click="changeInfo">\u4fee\u6539<\/button>\n<\/div><\/code><\/pre>\n
\u6ce8\u610f\uff1a\u5982\u679c ref()<\/code> \u5904\u7406\u7684\u662f\u5bf9\u8c61\u7c7b\u578b\u7684\u6570\u636e\uff0c\u5219\u5185\u90e8\u4f1a\u8c03\u7528 reactive()<\/code> \u51fd\u6570\u5c06\u5bf9\u8c61\u6570\u636e\u8f6c\u4e3a\u54cd\u5e94\u5f0f\u6570\u636e\uff0c\u7136\u540e\u6302\u8f7d\u4e3a .value<\/code> \u5c5e\u6027\u3002<\/p>\n
\n
\u6700\u4f73\u5b9e\u8df5\uff1a\u5c3d\u91cf\u4f7f\u7528 ref() \u6765\u5b9a\u4e49\u54cd\u5e94\u5f0f\u6570\u636e\uff0c\u56e0\u4e3a\u5b83\u65e2\u53ef\u4ee5\u5904\u7406\u503c\u7c7b\u578b\u6570\u636e\uff0c\u53c8\u53ef\u4ee5\u5904\u7406\u5bf9\u8c61\u7c7b\u578b\u7684\u6570\u636e\u3002<\/p>\n<\/blockquote>\n
2. \u8ba1\u7b97\u5c5e\u6027<\/h1>\n
\u8ba1\u7b97\u5c5e\u6027\u53ef\u4ee5\u907f\u514d\u7a0b\u5e8f\u5458\u5728\u6a21\u677f\u4e2d\u7f16\u5199\u5927\u6bb5\u7684 JavaScript \u8868\u8fbe\u5f0f\uff0c\u4ece\u800c\u63d0\u9ad8\u4ee3\u7801\u7684\u6574\u6d01\u5ea6\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n
2.1 \u57fa\u4e8e\u6a21\u677f\u4e2d\u7684\u8868\u8fbe\u5f0f\u7edf\u8ba1\u5546\u54c1\u4fe1\u606f<\/h2>\n
    \n
  1. \n
    \u5b9a\u4e49\u8d2d\u7269\u8f66\u4e2d\u7684\u5546\u54c1\u6570\u636e\u5982\u4e0b\uff1a<\/p>\n
    const { createApp, ref } = Vue\n\nconst app = createApp({\n setup() {\n   \/\/ \u8d2d\u7269\u8f66\u4e2d\u7684\u5546\u54c1\u6570\u636e\n   const goods = ref([\n     { id: 1, name: '\u7ea2\u70e7\u8089\u76d6\u996d', price: 26, count: 1 },\n     { id: 2, name: '\u5c0f\u9165\u8089', price: 12, count: 1 },\n     { id: 3, name: '\u51b0\u9547\u53ef\u4e50', price: 6, count: 1 }\n   ])\n\n   return {\n     goods\n   }\n }\n})\n\napp.mount('#app')<\/code><\/pre>\n<\/li>\n
  2. \n
    \u5728\u6a21\u677f\u4e2d\u6e32\u67d3\u8d2d\u7269\u8f66\u4e2d\u7684\u5546\u54c1\u6570\u636e\uff0c\u5e76\u57fa\u4e8e\u6a21\u677f\u4e2d\u7684\u8868\u8fbe\u5f0f\u8ba1\u7b97\u5546\u54c1\u7684\u6570\u91cf\u3001\u603b\u4ef7\u3001\u8fd0\u8d39\uff1a<\/p>\n
    <div id="app">\n <ul>\n   <li v-for="item in goods" :key="item.id">\n     <p>\u5546\u54c1\u540d\u79f0\uff1a{{item.name}}<\/p>\n     <p>\u5355\u4ef7\uff1a{{ item.price }}<\/p>\n     <p>\u8d2d\u4e70\u6570\u91cf\uff1a{{ item.count }}<\/p>\n   <\/li>\n <\/ul>\n\n <hr>\n <div>\n   <p>\u603b\u8ba1\uff1a<\/p>\n   <p>\u5546\u54c1\u6570\u91cf\uff1a{{ goods.reduce((total, item) => total += item.count, 0) }}<\/p>\n   <p>\u5546\u54c1\u603b\u4ef7\uff1a{{ goods.reduce((total, item) => total += item.price * item.count, 0) }}\u5143<\/p>\n   <p>\u914d\u9001\u8d39\uff1a{{ goods.reduce((total, item) => total += item.price * item.count, 0) >= 50 ? '\u514d\u914d\u9001\u8d39' : '5\u5143' }}<\/p>\n <\/div>\n<\/div><\/code><\/pre>\n<\/li>\n
  3. \n
    \u7f16\u5199\u6837\u5f0f\uff0c\u4e3a\u5546\u54c1\u6dfb\u52a0\u5206\u5272\u7ebf\uff1a<\/p>\n
    li+li {\n border-top: 1px solid #efefef;\n}<\/code><\/pre>\n<\/li>\n
  4. \n
    \u5728\u6b65\u9aa42\u4e2d\uff0c\u6211\u4eec\u53d1\u73b0\u6a21\u677f\u4e2d\u63ba\u6742\u4e86\u8f83\u4e3a\u590d\u6742\u7684\u8868\u8fbe\u5f0f\uff1b\u800c\u4e14\u5728\u5546\u54c1\u603b\u4ef7<\/strong>\u548c\u914d\u9001\u8d39<\/strong>\u4e2d\uff0c\u4e24\u6b21\u7528\u5230\u4e86\u5546\u54c1\u7684\u603b\u4ef7\uff0c\u4f46\u6bcf\u6b21\u90fd\u9700\u8981\u91cd\u65b0\u8ba1\u7b97\u603b\u4ef7\uff0c\u65e0\u6cd5\u5b9e\u73b0\u6570\u636e\u7684\u590d\u7528\u3002<\/p>\n
    \n
    \u57fa\u4e8e\u8fd9\u6837\u7684\u539f\u56e0\uff0c\u6211\u4eec\u53ef\u4ee5\u5229\u7528 computed \u8ba1\u7b97\u5c5e\u6027<\/strong>\uff0c\u628a\u6a21\u677f\u4e2d\u7684\u8868\u8fbe\u5f0f\u8fd0\u7b97\uff0c\u5c01\u88c5\u5230 JS \u4e2d\uff0c\u4ece\u800c\u8fbe\u5230\u7b80\u5316\u6a21\u677f<\/strong>\u548c\u5b9e\u73b0\u6570\u636e\u590d\u7528<\/strong>\u7684\u76ee\u7684\u3002<\/p>\n<\/blockquote>\n<\/li>\n<\/ol>\n
    2.2 \u8ba1\u7b97\u5c5e\u6027\u7684\u57fa\u672c\u8bed\u6cd5<\/h2>\n
      \n
    1. \n
      \u4ece Vue<\/code> \u5bf9\u8c61\u4e0a\u89e3\u6784\u51fa computed<\/code> \u51fd\u6570\uff0c\u5b83\u7528\u6765\u5b9a\u4e49\u8ba1\u7b97\u5c5e\u6027\uff1a<\/p>\n
      const { computed } = Vue<\/code><\/pre>\n<\/li>\n
    2. \n
      \u8c03\u7528 computed<\/code> \u51fd\u6570\uff0c\u540c\u65f6\u5411 computed<\/code> \u4e2d\u4f20\u9012\u4e00\u4e2a\u7bad\u5934\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\uff1a<\/p>\n
      const res = computed(() => {\n return \u8ba1\u7b97\u7684\u7ed3\u679c\n})<\/code><\/pre>\n
      \u800c\u4e14\uff0c\u5728\u7bad\u5934\u51fd\u6570\u4e2d\uff0c\u5fc5\u987b return \u4e00\u4e2a\u8ba1\u7b97\u7684\u7ed3\u679c<\/strong>\u3002\u5982\u679c\u5fd8\u8bb0\u4e86 return\uff0c\u5219\u662f\u4e00\u4e2a\u65e0\u6548\u7684\u8ba1\u7b97\u5c5e\u6027\u3002<\/p>\n<\/li>\n
    3. \n
      computed<\/code> \u51fd\u6570\u7684\u8fd4\u56de\u503c\uff0c\u662f\u4e00\u4e2a ref \u7684\u54cd\u5e94\u5f0f\u5bf9\u8c61\uff0c\u53ef\u901a\u8fc7 .value<\/code> \u8bbf\u95ee\u5176\u503c\u3002\u5982\u679c\u5728\u6a21\u677f\u4e2d\u8bbf\u95ee\uff0c\u4f1a\u81ea\u52a8\u8fdb\u884c\u89e3\u5305\uff1a<\/p>\n
      <div>{{ res }}<\/div><\/code><\/pre>\n<\/li>\n<\/ol>\n
      2.3 \u57fa\u4e8e\u8ba1\u7b97\u5c5e\u6027\u5b9e\u73b0\u52a0\u6cd5\u8fd0\u7b97<\/h2>\n
        \n
      1. \n
        \u901a\u8fc7 ref<\/code> \u5b9a\u4e49\u54cd\u5e94\u5f0f\u6570\u636e n1<\/code> \u548c n2<\/code>\uff0c\u901a\u8fc7 computed \u5b9a\u4e49\u8ba1\u7b97\u5c5e\u6027 result<\/code>\uff1a<\/p>\n
        const { createApp, ref, computed } = Vue\nconst app = createApp({\n setup() {\n   \/\/ \u54cd\u5e94\u5f0f ref \u6570\u636e\n   const n1 = ref(0)\n   const n2 = ref(0)\n\n   \/\/ \u8ba1\u7b97\u5c5e\u6027\uff0c\u4f9d\u8d56\u4e8e n1 \u548c n2 \u7684\u53d8\u5316\uff0c\u4f1a\u81ea\u52a8\u8fd0\u7b97\u5e76\u8fd4\u56de\u6700\u65b0\u7684\u7ed3\u679c\n   const result = computed(() => n1.value + n2.value)\n\n   return {\n     n1,\n     n2,\n     result\n   }\n }\n})\n\napp.mount('#app')<\/code><\/pre>\n<\/li>\n
      2. \n
        \u5728\u6a21\u677f\u4e2d\u4f7f\u7528\u8ba1\u7b97\u5c5e\u6027\uff1a<\/p>\n
        <div id="app">\n <input type="number" v-model="n1">\n <span>+<\/span>\n <input type="number" v-model="n2">\n <span>=<\/span>\n <span>{{ result }}<\/span>\n<\/div><\/code><\/pre>\n
        \n
        \u6ce8\u610f\uff1a\u5f53\u8ba1\u7b97\u5c5e\u6027\u4f9d\u8d56\u7684\u54cd\u5e94\u5f0f\u6570\u636e\u53d1\u751f\u53d8\u5316\u65f6\uff0c\u4f1a\u81ea\u52a8\u5bf9\u8ba1\u7b97\u5c5e\u6027\u91cd\u65b0\u6c42\u503c\u3002<\/p>\n<\/blockquote>\n<\/li>\n<\/ol>\n
        2.4 \u57fa\u4e8e\u8ba1\u7b97\u5c5e\u6027\u6539\u9020\u8d2d\u7269\u8f66\u6848\u4f8b<\/h2>\n
          \n
        1. \n
          \u5b9a\u4e49\u8d2d\u7269\u8f66\u4e2d\u7684\u5546\u54c1\u6570\u636e\u5982\u4e0b\uff1a<\/p>\n
          const { createApp, ref } = Vue\n\nconst app = createApp({\n setup() {\n   \/\/ \u8d2d\u7269\u8f66\u4e2d\u7684\u5546\u54c1\u6570\u636e\n   const goods = ref([\n     { id: 1, name: '\u7ea2\u70e7\u8089\u76d6\u996d', price: 26, count: 1 },\n     { id: 2, name: '\u5c0f\u9165\u8089', price: 12, count: 1 },\n     { id: 3, name: '\u51b0\u9547\u53ef\u4e50', price: 6, count: 1 }\n   ])\n\n   return {\n     goods\n   }\n }\n})\n\napp.mount('#app')<\/code><\/pre>\n<\/li>\n
        2. \n
          \u5206\u6790\u6a21\u677f\u7684\u7ed3\u6784\uff0c\u6211\u4eec\u53ef\u4ee5\u5f97\u5230\u5982\u4e0b\u7684\u7ed3\u8bba\uff1a<\/p>\n
            \n
          • \u5546\u54c1\u7684\u6570\u91cf<\/strong>\uff0c\u662f\u8d2d\u7269\u8f66\u4e2d\u6240\u6709\u5546\u54c1\u7684\u6570\u91cf\u603b\u548c\uff0c\u4f9d\u8d56\u4e8e\u6bcf\u4e2a\u5546\u54c1\u6570\u91cf\u7684\u53d8\u5316\uff0c\u662f\u4e00\u4e2a\u6d3e\u751f\u5c5e\u6027<\/li>\n
          • \u5546\u54c1\u7684\u603b\u4ef7<\/strong>\uff0c\u662f\u8d2d\u7269\u8f66\u4e2d\u6240\u6709\u5546\u54c1\u7684\u5355\u4ef7\u00d7\u6570\u91cf\u7684\u603b\u548c\uff0c\u4f9d\u8d56\u4e8e\u6bcf\u4e2a\u5546\u54c1\u7684\u6570\u91cf\u548c\u5355\u4ef7\u7684\u53d8\u5316\uff0c\u662f\u4e00\u4e2a\u6d3e\u751f\u5c5e\u6027<\/li>\n
          • \u5546\u54c1\u7684\u8fd0\u8d39<\/strong>\uff0c\u4f9d\u8d56\u4e8e\u5546\u54c1\u603b\u4ef7\u7684\u53d8\u5316\u800c\u53d8\u5316\uff0c\u4e5f\u662f\u4e00\u4e2a\u6d3e\u751f\u5c5e\u6027<\/li>\n<\/ul>\n
            \u6240\u4ee5\uff0c\u6211\u4eec\u53ef\u4ee5\u57fa\u4e8e\u8ba1\u7b97\u5c5e\u6027\uff0c\u5206\u522b\u8ba1\u7b97\u51fa\u4ee5\u4e0a3\u4e2a\u6570\u636e\u7684\u503c\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
            \/\/ 1. \u5bfc\u5165 computed \u51fd\u6570\nconst { createApp, ref, computed } = Vue\n\nconst app = createApp({\n setup() {\n   \/\/ \u8d2d\u7269\u8f66\u4e2d\u7684\u5546\u54c1\u6570\u636e\n   const goods = ref([\n     { id: 1, name: '\u7ea2\u70e7\u8089\u76d6\u996d', price: 26, count: 1 },\n     { id: 2, name: '\u5c0f\u9165\u8089', price: 12, count: 1 },\n     { id: 3, name: '\u51b0\u9547\u53ef\u4e50', price: 6, count: 1 }\n   ])\n\n   \/\/ 2.1 \u8ba1\u7b97\u5c5e\u6027\uff1a\u5546\u54c1\u603b\u6570\u91cf\n   const total = computed(() => goods.value.reduce((t, item) => t += item.count, 0))\n   \/\/ 2.2 \u8ba1\u7b97\u5c5e\u6027\uff1a\u5546\u54c1\u7684\u603b\u4ef7\u683c\n   const amount = computed(() => goods.value.reduce((t, item) => t += item.price * item.count, 0))\n   \/\/ 2.3 \u8ba1\u7b97\u5c5e\u6027\uff1a\u8fd0\u8d39\n   const freight = computed(() => amount.value >= 50 ? '\u514d\u914d\u9001\u8d39' : '5\u5143')\n\n   return {\n     goods,\n     \/\/ 3. \u628a\u8ba1\u7b97\u5c5e\u6027\u66b4\u9732\u7ed9\u6a21\u677f\u4f7f\u7528\n     total,\n     amount,\n     freight\n   }\n }\n})\n\napp.mount('#app')<\/code><\/pre>\n<\/li>\n
          • \n
            \u5728\u6a21\u677f\u4e2d\uff0c\u4f7f\u7528\u4f7f\u7528\u8fd9\u4e09\u4e2a\u8ba1\u7b97\u5c5e\u6027\u7684\u503c\u5373\u53ef\uff1a<\/p>\n
            <div>\n <p>\u603b\u8ba1\uff1a<\/p>\n <p>\u5546\u54c1\u6570\u91cf\uff1a{{ total }}<\/p>\n <p>\u5546\u54c1\u603b\u4ef7\uff1a{{ amount }}\u5143<\/p>\n <p>\u914d\u9001\u8d39\uff1a{{ freight }}<\/p>\n<\/div><\/code><\/pre>\n
            \n
            \u601d\u8003\uff1a\u5982\u679c\u5728\u6a21\u677f\u4e2d\uff0c\u60f3\u8981\u628a\u5b9e\u9645\u7684\u652f\u4ed8\u91d1\u989d<\/strong>\uff08\u5546\u54c1\u603b\u4ef7 + \u8fd0\u8d39\uff09\u663e\u793a\u51fa\u6765\uff0c\u7528\u8ba1\u7b97\u5c5e\u6027\u8be5\u5982\u4f55\u5b9e\u73b0\uff1f<\/p>\n<\/blockquote>\n<\/li>\n<\/ol>\n
            2.5 \u8ba1\u7b97\u5c5e\u6027\u7684\u7f13\u5b58 vs \u65b9\u6cd5<\/h2>\n
            \u6211\u4eec\u53d1\u73b0\uff0c\u5982\u679c\u628a\u8ba1\u7b97\u5c5e\u6027\u7684\u4e1a\u52a1\u903b\u8f91\u5c01\u88c5\u5230 function \u4e2d\uff0c\u4e5f\u80fd\u5b9e\u73b0\u76f8\u540c\u7684\u7ed3\u679c\uff0c\u4f8b\u5982\u8ba1\u7b97\u4e24\u4e2a\u6570\u4e4b\u548c\u7684\u6848\u4f8b\uff1a<\/p>\n
            const { createApp, ref } = Vue\nconst app = createApp({\n  setup() {\n    const n1 = ref(0)\n    const n2 = ref(0)\n\n    \/\/ 1. \u5b9a\u4e49\u4e00\u4e2a\u7528\u4e8e\u8ba1\u7b97\u7684\u65b9\u6cd5\n    const getResult = () => {\n      console.log('\u89e6\u53d1\u4e86 function \u7684\u6267\u884c')\n      return n1.value + n2.value\n    }\n\n    return {\n      n1,\n      n2,\n      \/\/ 2. \u5411\u6a21\u677f\u66b4\u9732\u8fd9\u4e2a\u65b9\u6cd5\n      getResult\n    }\n  }\n})\n\napp.mount('#app')<\/code><\/pre>\n
            \u63a5\u4e0b\u6765\uff0c\u5728\u6a21\u677f\u4e2d\u8c03\u7528\u8fd9\u4e2a\u65b9\u6cd5\uff0c\u663e\u793a\u8ba1\u7b97\u7684\u7ed3\u679c\uff1a<\/p>\n
            <div id="app">\n  <input type="number" v-model="n1">\n  <span>+<\/span>\n  <input type="number" v-model="n2">\n  <span>=<\/span>\n  <span>{{ getResult() }}<\/span>\n<\/div><\/code><\/pre>\n
            \u6ce8\u610f\uff1a\u4f7f\u7528 function \u5e76\u4e0d\u4f1a\u7f13\u5b58\u8ba1\u7b97\u7684\u7ed3\u679c\u3002\u5f53\u6211\u4eec\u5728\u6a21\u677f\u4e2d\u591a\u6b21\u8c03\u7528\u8fd9\u4e2a function \u65f6\uff0c\u6bcf\u6b21\u4f7f\u7528\u90fd\u4f1a\u89e6\u53d1\u7684\u7684\u6267\u884c\uff0c\u54ea\u6015\u6bcf\u6b21\u8ba1\u7b97\u7684\u7ed3\u679c\u90fd\u662f\u4e00\u6a21\u4e00\u6837\u7684\uff1a<\/p>\n
            <div id="app">\n  <input type="number" v-model="n1">\n  <span>+<\/span>\n  <input type="number" v-model="n2">\n  <span>=<\/span>\n  <!-- \u7b2c1\u6b21\u8c03\u7528\u65b9\u6cd5 -->\n  <span>{{ getResult() }}<\/span>\n\n  <hr>\n  <!-- \u7b2c2\u6b21\u8c03\u7528\u65b9\u6cd5 -->\n  <div>{{ getResult() }}<\/div>\n  <!-- \u7b2c3\u6b21\u8c03\u7528\u65b9\u6cd5 -->\n  <div>{{ getResult() }}<\/div>\n<\/div><\/code><\/pre>\n
            \u6240\u4ee5 function \u603b\u662f\u4f1a\u5728\u6bcf\u6b21\u8c03\u7528\u65f6\u91cd\u65b0\u6267\u884c\u8ba1\u7b97\u7684\u8fc7\u7a0b\uff0c\u4e0d\u4f1a\u5bf9\u8ba1\u7b97\u7684\u7ed3\u679c\u8fdb\u884c\u7f13\u5b58\u3002<\/p>\n
            \u800c computed \u8ba1\u7b97\u5c5e\u6027\u5c31\u5f88\u597d\u7684\u5b9e\u73b0\u4e86\u7f13\u5b58\u7684\u529f\u80fd\uff1a\u5f53\u8ba1\u7b97\u5c5e\u6027\u4e2d\u6240\u4f9d\u8d56\u7684\u54cd\u5e94\u5f0f\u6570\u636e<\/strong>\u6ca1\u6709\u53d1\u751f\u53d8\u5316\u65f6\uff0c\u591a\u6b21<\/strong>\u4f7f\u7528\u8ba1\u7b97\u5c5e\u6027\uff0c\u4f1a\u7acb\u5373\u8fd4\u56de\u4e4b\u524d\u8ba1\u7b97\u7684\u7ed3\u679c<\/strong>\uff0c\u8fd9\u6781\u5927\u7684\u63d0\u9ad8\u4e86\u8ba1\u7b97\u7684\u6027\u80fd\u3002<\/p>\n
            \n
            \u8ba1\u7b97\u5c5e\u6027\u7684\u4f18\u70b9\uff1a1. \u80fd\u7f13\u5b58\u8ba1\u7b97\u7684\u7ed3\u679c 2. \u80fd\u7b80\u5316\u6a21\u677f\u7684\u4ee3\u7801<\/p>\n<\/blockquote>\n
            3. \u4fa6\u542c\u5668<\/h1>\n
            \u4fa6\u542c\u5668\u5141\u8bb8\u6211\u4eec\u76d1\u89c6\u54cd\u5e94\u5f0f\u6570\u636e\u7684\u53d8\u5316\uff0c\u5e76\u89e6\u53d1\u56de\u8c03\u51fd\u6570\u7684\u6267\u884c\uff0c\u5728\u56de\u8c03\u51fd\u6570\u7684\u5f62\u53c2\u4e2d\uff0c\u53ef\u4ee5\u63a5\u6536 newValue<\/code> \u548c oldValue<\/code> \u4e24\u4e2a\u5f62\u53c2\uff0c\u5206\u522b\u4ee3\u8868\u53d8\u5316\u540e\u7684\u65b0\u503c<\/strong>\u548c\u53d8\u5316\u524d\u7684\u65e7\u503c<\/strong>\u3002<\/p>\n
            3.1 \u4fa6\u542c\u5668\u7684\u57fa\u672c\u8bed\u6cd5<\/h2>\n
              \n
            1. \n
              \u4ece Vue<\/code> \u5bf9\u8c61\u4e0a\u89e3\u6784\u51fa watch<\/code> \u51fd\u6570\uff1a<\/p>\n
              const { watch } = Vue<\/code><\/pre>\n<\/li>\n
            2. \n
              \u5728 setup<\/code> \u51fd\u6570\u4e2d\uff0c\u8c03\u7528 watch<\/code> \u51fd\u6570\uff0c\u58f0\u660e\u4fa6\u542c\u5668\uff1a<\/p>\n
              watch(\u8981\u76d1\u89c6\u7684\u54cd\u5e94\u5f0f\u6570\u636e, (\u65b0\u503c, \u65e7\u503c) => { \/* \u56de\u8c03\u51fd\u6570\u7684\u64cd\u4f5c *\/ })<\/code><\/pre>\n<\/li>\n
            3. \n
              \u4f8b\u5982\uff1a<\/p>\n
              const { createApp, ref, watch } = Vue\n\nconst app = createApp({\n setup() {\n   \/\/ 1. \u4ece\u672c\u5730\u5b58\u50a8\u4e2d\u8bfb\u53d6\u521d\u59cb\u503c\n   const initValue = localStorage.getItem('count') || 0\n   \/\/ 2. \u5c06\u521d\u59cb\u503c\u8f6c\u4e3a\u6574\u6570\u540e\uff0c\u8d4b\u503c\u7ed9 count\n   const count = ref(parseInt(initValue))\n\n   const add = (step) => {\n     count.value += step\n   }\n\n   \/\/ 3. \u76d1\u542c count \u7684\u53d8\u5316\uff0c\u5e76\u628a\u65b0\u503c\u5b58\u50a8\u5230\u672c\u5730\n   watch(count, (newValue) => {\n     \/\/ BOM \u7684 API\n     localStorage.setItem('count', newValue)\n   })\n\n   return {\n     count,\n     add\n   }\n }\n})\n\napp.mount('#app')<\/code><\/pre>\n
              \u5bf9\u5e94\u7684\u6a21\u677f\u4e3a\uff1a<\/p>\n
              <div id="app">\n <h1>{{ count }}<\/h1>\n <button @click="add(1)">+1<\/button>\n <button @click="add(2)">+2<\/button>\n <button @click="add(3)">+3<\/button>\n<\/div><\/code><\/pre>\n<\/li>\n<\/ol>\n
              3.2 \u505c\u6b62\u4fa6\u542c\u5668<\/h2>\n
              \u8c03\u7528 watch<\/code> \u51fd\u6570\u4f1a\u521b\u5efa\u4e00\u4e2a\u4fa6\u542c\u5668\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u7ec8\u6b62\u4fa6\u542c\u5668\u7684\u51fd\u6570\uff0c\u8bed\u6cd5\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n
              const unwatch = watch()\n\n\/\/ \u5f53\u4fa6\u542c\u5668\u4e0d\u518d\u9700\u8981\u65f6\uff0c\u53ef\u8c03\u7528 unwatch \u505c\u6b62\u5b83\nunwatch()<\/code><\/pre>\n
              \u6211\u4eec\u53ef\u4ee5\u6539\u9020\u4e00\u4e0b\u524d\u9762\u7684\u4f8b\u5b50\uff0c\u5f53 count >= 20<\/code> \u65f6\uff0c\u6211\u4eec\u5e0c\u671b\u505c\u6b62\u4fa6\u542c\u5668\u7684\u6267\u884c\uff0c\u5e76\u4e14\u79fb\u9664\u672c\u5730\u5b58\u50a8\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
              \/\/ \u76d1\u542c count \u7684\u53d8\u5316\uff0c\u5e76\u628a\u65b0\u503c\u5b58\u50a8\u5230\u672c\u5730\nconst unwatch = watch(count, (newValue) => {\n  if (newValue >= 20) {\n    console.log('\u6570\u503c>=20\u4e86')\n    unwatch() \/\/ \u505c\u6b62\u4fa6\u542c\u5668\n    localStorage.removeItem('count') \/\/ \u79fb\u9664\u672c\u5730\u5b58\u50a8\u7684\u6570\u636e\n    return\n  }\n  localStorage.setItem('count', newValue)\n})<\/code><\/pre>\n
              3.3 \u4fa6\u542c\u7684\u6570\u636e\u6e90\u7c7b\u578b<\/h2>\n
              watch<\/code> \u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u53ef\u4ee5\u662f\u4e0d\u540c\u5f62\u5f0f\u7684\u201c\u6570\u636e\u6e90\u201d\uff1a\u5b83\u53ef\u4ee5\u662f\u4e00\u4e2a ref (\u5305\u62ec\u8ba1\u7b97\u5c5e\u6027)\u3001\u4e00\u4e2a\u54cd\u5e94\u5f0f\u5bf9\u8c61\u3001\u4e00\u4e2a getter \u51fd\u6570\u3001\u6216\u591a\u4e2a\u6570\u636e\u6e90\u7ec4\u6210\u7684\u6570\u7ec4\u3002<\/p>\n
              1. \u4fa6\u542c ref \u6570\u636e\u6e90<\/h3>\n
              setup() {\n  \/\/ 1. \u5b9a\u4e49 ref \u7c7b\u578b\u7684\u54cd\u5e94\u5f0f\u6570\u636e\n  const x = ref(0)\n\n  \/\/ \u76d1\u542c ref \u6570\u636e\u7684\u53d8\u5316\n  watch(x, (newValue, oldValue) => {\n    console.log(newValue, oldValue)\n  })\n\n  return {\n    x\n  }\n}<\/code><\/pre>\n
              2. \u4fa6\u542c reactive \u6570\u636e\u6e90<\/h3>\n
              setup() {\n  \/\/ 1. \u5b9a\u4e49 reactive \u7c7b\u578b\u7684\u54cd\u5e94\u5f0f\u6570\u636e\n  const obj = reactive({ count: 0 })\n\n  \/\/ 2. \u76d1\u542c reactive \u6570\u636e\u7684\u53d8\u5316\n  watch(obj, (newValue, oldValue) => {\n    \/\/ \u6ce8\u610f\uff1a\u8fd9\u91cc\u7684 newValue \u548c oldValue \u662f\u53d8\u5316\u524d\u540e\u7684\u540c\u4e00\u4e2a\u5bf9\u8c61\n    \/\/ \u6240\u4ee5\uff0c\u5b83\u4eec\u91cc\u9762\u7684\u6570\u636e\u5b8c\u5168\u4e00\u6837\n    console.log(newValue.count, oldValue.count)\n    console.log(newValue, oldValue)\n  })\n\n  return {\n    obj\n  }\n}<\/code><\/pre>\n
              3. \u4fa6\u542c reactive \u4e2d\u67d0\u4e2a\u5c5e\u6027\u7684\u53d8\u5316\uff08\u5c5e\u6027\u503c\u4e3a\u5bf9\u8c61\uff09<\/h3>\n
                \n
              1. \n
                \u5b9a\u4e49 reactive<\/code> \u7c7b\u578b\u7684\u54cd\u5e94\u5f0f\u6570\u636e obj<\/code>\uff0c\u5176\u4e2d obj.info<\/code> \u662f\u4e00\u4e2a\u5bf9\u8c61\uff1a<\/p>\n
                const obj = reactive({ count: 0, info: { name: 'zs', age: 18 } })<\/code><\/pre>\n<\/li>\n
              2. \n
                \u5982\u679c\u60f3\u4fa6\u542c obj.info<\/code> \u4e0b\u6bcf\u4e2a\u5c5e\u6027\u7684\u53d8\u5316\uff0c\u5e76\u5f97\u5230\u53d8\u5316\u540e\u7684\u65b0 obj.info<\/code> \u5bf9\u8c61\uff0c\u5219\u53ef\u4ee5\u4f7f\u7528 watch<\/code> \u8fdb\u884c\u5982\u4e0b\u7684\u4fa6\u542c\uff1a<\/p>\n
                watch(obj.info, (newValue, oldValue) => {\n \/\/ \u6ce8\u610f\uff1a\u8fd9\u91cc\u7684 newValue \u548c oldValue \u662f\u53d8\u5316\u524d\u540e\u7684\u540c\u4e00\u4e2a\u5bf9\u8c61\n \/\/ \u6240\u4ee5\uff0c\u5b83\u4eec\u91cc\u9762\u7684\u6570\u636e\u5b8c\u5168\u4e00\u6837\n console.log(newValue, oldValue)\n})<\/code><\/pre>\n<\/li>\n
              3. \n
                \u5f53\u6211\u4eec\u4fee\u6539 obj.info.name<\/code> \u7684\u503c\uff0c\u6216\u4fee\u6539 obj.info.age<\/code> \u7684\u503c\uff0c\u90fd\u4f1a\u89e6\u53d1\u6b64\u4fa6\u542c\u5668\u3002\u5f97\u5230\u7684 newValue<\/code> \u662f\u53d8\u5316\u540e\u65b0\u7684 obj.info<\/code> \u5bf9\u8c61\u3002<\/p>\n<\/li>\n<\/ol>\n
                4. \u57fa\u4e8e getter \u4fa6\u542c reactive \u4e2d\u67d0\u4e2a\u5c5e\u6027\u7684\u66ff\u6362\u64cd\u4f5c\uff08\u5c5e\u6027\u503c\u4e3a\u5bf9\u8c61\uff09<\/h3>\n
                  \n
                1. \n
                  \u5b9a\u4e49 reactive<\/code> \u7c7b\u578b\u7684\u54cd\u5e94\u5f0f\u6570\u636e obj<\/code>\uff0c\u5176\u4e2d obj.info<\/code> \u662f\u4e00\u4e2a\u5bf9\u8c61\uff1a<\/p>\n
                  const obj = reactive({ count: 0, info: { name: 'zs', age: 18 } })<\/code><\/pre>\n<\/li>\n
                2. \n
                  \u5982\u679c\u60f3\u4fa6\u542c obj.info<\/code> \u5bf9\u8c61\u7684\u66ff\u6362\u64cd\u4f5c\uff0c\u4f8b\u5982\uff0c\u5728\u5b9a\u65f6\u5668\u4e2d\u628a obj.info<\/code> \u66ff\u6362\u4e3a\u4e00\u4e2a\u65b0\u5bf9\u8c61\uff1a<\/p>\n
                  setTimeout(() => {\n obj.info = { username: 'ls', gender: '\u7537' }\n}, 1000)<\/code><\/pre>\n<\/li>\n
                3. \n
                  \u6b64\u65f6\uff0c\u4f7f\u7528 watch(obj.info, \u56de\u8c03\u51fd\u6570)<\/code> \u65e0\u6cd5\u4fa6\u542c\u5230\u5bf9\u8c61\u7684\u66ff\u6362\u64cd\u4f5c\u3002\u5fc5\u987b\u4f7f\u7528 getter<\/strong> \u624d\u80fd\u4fa6\u542c\u5230\u5bf9\u8c61\u7684\u66ff\u6362\u64cd\u4f5c<\/strong>\uff1a<\/p>\n
                  watch(() => obj.info, (newValue, oldValue) => {\n \/\/ \u6ce8\u610f\uff1a\u8fd9\u91cc\u7684 newValue \u548c oldValue \u662f\u53d8\u5316\u524d\u540e\u7684\u4e0d\u540c\u7684\u5bf9\u8c61\n \/\/ \u6240\u4ee5\uff0c\u5b83\u4eec\u91cc\u9762\u7684\u6570\u636e\u662f\u4e0d\u540c\u7684\n console.log(newValue, oldValue)\n})<\/code><\/pre>\n
                  \n
                  \u6ce8\u610f\uff1a\u6240\u8c13\u7684 getter\uff0c\u6307\u7684\u5c31\u662f\u901a\u8fc7\u7bad\u5934\u51fd\u6570<\/strong>\u6765\u8bbf\u95ee\u54cd\u5e94\u5f0f\u5bf9\u8c61\u4e2d\u7684\u67d0\u4e2a\u5177\u4f53\u5c5e\u6027<\/strong>\u7684\u53d6\u503c\u64cd\u4f5c\u3002<\/p>\n<\/blockquote>\n<\/li>\n<\/ol>\n
                  5. \u57fa\u4e8e getter \u4fa6\u542c reactive \u4e2d\u67d0\u4e2a\u503c\u7c7b\u578b\u6570\u636e\u7684\u53d8\u5316<\/h3>\n
                    \n
                  1. \n
                    \u5b9a\u4e49 reactive<\/code> \u7c7b\u578b\u7684\u54cd\u5e94\u5f0f\u6570\u636e obj<\/code>\uff0c\u5176\u4e2d obj.info<\/code> \u662f\u4e00\u4e2a\u5bf9\u8c61\uff1a<\/p>\n
                    const obj = reactive({ count: 0, info: { name: 'zs', age: 18 } })<\/code><\/pre>\n<\/li>\n
                  2. \n
                    \u5982\u679c\u60f3\u4fa6\u542c obj.count<\/code> \u7684\u53d8\u5316\uff0c\u5219\u4e0d\u80fd\u4f7f\u7528 watch(obj.count, \u56de\u8c03\u51fd\u6570)<\/code> \u7684\u65b9\u5f0f\u8fdb\u884c\u4fa6\u542c\u3002\u56e0\u4e3a obj.count<\/code> \u8fd4\u56de\u7684\u662f\u5177\u4f53\u7684\u503c\uff0c\u4e0d\u662f\u54cd\u5e94\u5f0f\u7684\u6570\u636e\u3002\u56e0\u6b64\uff0c\u5fc5\u987b\u4f7f\u7528 getter \u624d\u80fd\u4fa6\u542c\u5230\u5bf9\u8c61\u4e2d\u503c\u7c7b\u578b\u6570\u636e\u7684\u53d8\u5316\uff1a<\/p>\n
                    \/\/ \u6ce8\u610f\uff1areactive \u4e2d\u503c\u7c7b\u578b\u7684\u6570\u636e\uff0c\u53ea\u80fd\u901a\u8fc7 getter \u8fdb\u884c\u4fa6\u542c\nwatch(() => obj.count, (newValue, oldValue) => {\n \/\/ \u5176\u4e2d\uff0cnewValue \u503c\u53d8\u5316\u540e\u7684\u65b0\u503c\uff1boldValue \u662f\u53d8\u5316\u524d\u7684\u65e7\u503c\n console.log(newValue, oldValue)\n})<\/code><\/pre>\n<\/li>\n<\/ol>\n
                    6. \u4fa6\u542c\u591a\u4e2a\u6570\u636e\u6e90\u7ec4\u6210\u7684\u6570\u7ec4<\/h3>\n
                      \n
                    1. \n
                      \u5b9a\u4e49 ref<\/code> \u548c reactive<\/code> \u7c7b\u578b\u7684\u54cd\u5e94\u5f0f\u6570\u636e\u5982\u4e0b\uff1a<\/p>\n
                      \/\/ ref \u7c7b\u578b\u7684\u54cd\u5e94\u5f0f\u6570\u636e\nconst x = ref(0)\n\/\/ reactive \u7c7b\u578b\u7684\u54cd\u5e94\u5f0f\u6570\u636e\nconst obj = reactive({ count: 0, info: { name: 'zs', age: 18 } })<\/code><\/pre>\n<\/li>\n
                    2. \n
                      \u8c03\u7528 watch<\/code> \u58f0\u660e\u4fa6\u542c\u5668\u65f6\uff0c\u63d0\u4f9b\u4e00\u4e2a\u8981\u4fa6\u542c\u7684\u6570\u636e\u6e90\u7684\u6570\u7ec4<\/strong>\uff0c\u5f53\u5176\u4e2d\u4efb\u4f55\u4e00\u4e2a\u6570\u636e\u53d1\u751f\u53d8\u5316\u65f6\uff0c\u90fd\u4f1a\u89e6\u53d1\u56de\u8c03\u51fd\u6570\u7684\u6267\u884c\uff1a<\/p>\n
                      watch([x, () => obj.count], ([newX, newCount], [oldX, oldCount]) => {\n console.log(newX, newCount)\n console.log(oldX, oldCount)\n})<\/code><\/pre>\n<\/li>\n<\/ol>\n
                      3.4 \u6df1\u5c42\u4fa6\u542c\u5668<\/h2>\n
                        \n
                      1. \n
                        \u5047\u8bbe\u6709\u5982\u4e0b\u7684\u54cd\u5e94\u5f0f\u6570\u636e\uff1a<\/p>\n
                        const obj = reactive({ count: 0, info: { name: 'zs', age: 18 } })<\/code><\/pre>\n<\/li>\n
                      2. \n
                        \u5982\u679c\u5b9a\u4e49\u4e86 watch(obj.info, \u56de\u8c03\u51fd\u6570)<\/code> \u4fa6\u542c\u5668\uff0c\u5219\u53ea\u80fd\u4fa6\u542c\u5230 obj.info.name<\/code>  \u6216 obj.info.age<\/code> \u7684\u4fee\u6539\u64cd\u4f5c\uff0c\u65e0\u6cd5\u4fa6\u542c\u5230 obj.info<\/code> \u5bf9\u8c61\u7684\u66ff\u6362\u64cd\u4f5c\u3002<\/p>\n<\/li>\n
                      3. \n
                        \u5982\u679c\u5b9a\u4e49\u4e86 watch(() => obj.info, \u56de\u8c03\u51fd\u6570)<\/code> \u4fa6\u542c\u5668\uff0c\u5219\u53ea\u80fd\u4fa6\u542c\u5230 obj.info<\/code> \u5bf9\u8c61\u7684\u66ff\u6362\u64cd\u4f5c\uff0c\u65e0\u6cd5\u4fa6\u542c\u5230\u67d0\u4e2a\u5177\u4f53\u5c5e\u6027\u7684\u4fee\u6539\u64cd\u4f5c\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u76ee\u524d\u7684\u60c5\u51b5\u4e0b\u9c7c\u548c\u718a\u638c\u4e0d\u53ef\u517c\u5f97\u3002<\/p>\n<\/li>\n
                      4. \n
                        \u5982\u679c\u65e2\u60f3\u4fa6\u542c\u5230\u5bf9\u8c61\u7684\u66ff\u6362\u64cd\u4f5c<\/strong>\uff0c\u53c8\u60f3\u4fa6\u542c\u5230\u5bf9\u8c61\u4e0b\u67d0\u4e2a\u5177\u4f53\u5c5e\u6027\u7684\u4fee\u6539\u64cd\u4f5c<\/strong>\u3002\u6b64\u65f6\u53ef\u4ee5\u7ed9 watch \u4fa6\u542c\u5668\u63d0\u4f9b\u7b2c3\u4e2a\u53c2\u6570<\/strong>\uff0c\u5b83\u662f\u4e00\u4e2a\u914d\u7f6e\u5bf9\u8c61\uff0c\u901a\u8fc7 deep: true<\/code> \u9009\u9879\u5373\u53ef\u5b9e\u73b0\u6211\u4eec\u7684\u76ee\u7684\uff0c\u8bed\u6cd5\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n
                        watch(() => obj.info, (newValue, oldValue) => {\n \/\/ 1. \u5f53\u89e6\u53d1 obj.info \u5bf9\u8c61\u7684\u66ff\u6362\u64cd\u4f5c\u65f6\uff0c\u4f1a\u89e6\u53d1\u6b64\u56de\u8c03\u51fd\u6570\u7684\u6267\u884c\n \/\/ 2. \u5f53\u4fee\u6539 obj.info.name \u6216 obj.info.age \u65f6\uff0c\u4e5f\u4f1a\u89e6\u53d1\u6b64\u56de\u8c03\u51fd\u6570\u7684\u6267\u884c\n}, { deep: true })<\/code><\/pre>\n<\/li>\n<\/ol>\n
                        3.5 \u5373\u65f6\u56de\u8c03\u7684\u4fa6\u542c\u5668<\/h2>\n
                        watch<\/code> \u9ed8\u8ba4\u662f\u61d2\u6267\u884c<\/strong>\u7684\uff1a\u4ec5\u5f53\u6570\u636e\u6e90\u53d8\u5316\u65f6\uff0c\u624d\u4f1a\u6267\u884c\u56de\u8c03\u3002\u4f46\u5728\u67d0\u4e9b\u573a\u666f\u4e2d\uff0c\u6211\u4eec\u5e0c\u671b\u5728\u521b\u5efa\u4fa6\u542c\u5668\u65f6\uff0c\u7acb\u5373\u6267\u884c\u4e00\u904d\u56de\u8c03\u3002<\/p>\n
                        \u6b64\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4f20\u5165 immediate: true<\/code> \u9009\u9879\u6765\u5f3a\u5236\u4fa6\u542c\u5668\u7684\u56de\u8c03\u7acb\u5373\u6267\u884c\uff1a<\/p>\n
                        watch(source, (newValue, oldValue) => {\n  \/\/ \u7acb\u5373\u6267\u884c\uff0c\u4e14\u5f53 `source` \u6539\u53d8\u65f6\u518d\u6b21\u6267\u884c\n}, { immediate: true })<\/code><\/pre>\n
                        3.6 \u56de\u8c03\u7684\u89e6\u53d1\u65f6\u673a<\/h2>\n
                        \u5f53\u4f60\u66f4\u6539\u4e86\u54cd\u5e94\u5f0f\u72b6\u6001\uff0c\u5b83\u53ef\u80fd\u4f1a\u540c\u65f6\u89e6\u53d1 Vue \u7ec4\u4ef6\u66f4\u65b0<\/strong>\u548c\u4fa6\u542c\u5668\u56de\u8c03<\/strong>\u3002<\/p>\n
                        \u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u7528\u6237\u521b\u5efa\u7684\u4fa6\u542c\u5668\u56de\u8c03\uff0c\u90fd\u4f1a\u5728 Vue \u7ec4\u4ef6\u66f4\u65b0\u4e4b\u524d<\/strong>\u88ab\u8c03\u7528\u3002\u8fd9\u610f\u5473\u7740\u4f60\u5728\u4fa6\u542c\u5668\u56de\u8c03\u4e2d\u8bbf\u95ee\u7684 DOM \u5c06\u662f\u88ab Vue \u66f4\u65b0\u4e4b\u524d\u7684\u72b6\u6001\u3002<\/p>\n
                        \u5982\u679c\u60f3\u5728\u4fa6\u542c\u5668\u56de\u8c03\u4e2d\u80fd\u8bbf\u95ee\u88ab Vue \u66f4\u65b0\u4e4b\u540e<\/strong>\u7684 DOM\uff0c\u4f60\u9700\u8981\u6307\u660e flush: 'post'<\/code> \u9009\u9879\uff1a<\/p>\n
                        watch(source, callback, {\n  flush: 'post'\n})<\/code><\/pre>\n
                        \u4f8b\u5982\uff0c\u5728 watch<\/code> \u4fa6\u542c\u5668\u4e2d\uff0c\u5982\u679c\u60f3\u5f97\u5230\u6700\u65b0\u7684 DOM \u5185\u5bb9\uff0c\u5219\u9700\u8981\u6dfb\u52a0 flush: post<\/code> \u9009\u9879\uff0c\u5426\u5219\u5f97\u5230\u7684\u662f DOM \u66f4\u65b0\u524d\u7684\u65e7\u5185\u5bb9\uff1a<\/p>\n
                        setup() {\n  \/\/ 1. \u5b9a\u4e49 ref \u7c7b\u578b\u7684\u54cd\u5e94\u5f0f\u6570\u636e\n  const count = ref(0)\n\n  \/\/ 2. \u4fa6\u542c count \u7684\u53d8\u5316\n  watch(count, () => {\n    \/\/ \u83b7\u53d6 DOM \u5143\u7d20\n    const dom = document.querySelector('#title')\n    \/\/ \u6253\u5370\u5185\u90e8\u7684\u6587\u672c\n    console.log(dom.innerText)\n  }, { flush: 'post' })\n\n  return {\n    count\n  }\n}<\/code><\/pre>\n
                        \u5bf9\u5e94\u7684\u6a21\u677f\u7ed3\u6784\u4e3a\uff1a<\/p>\n
                        <div id="app">\n  <h1 id="title">count\u7684\u503c\u662f\uff1a{{ count }}<\/h1>\n  <button @click="count++">+1<\/button>\n<\/div><\/code><\/pre>\n
                        3.7 watchEffect()<\/h2>\n
                        1. watch \u4fa6\u542c\u5668\u7684\u7f3a\u70b9<\/h3>\n
                        watch \u4fa6\u542c\u5668\u9700\u8981\u624b\u52a8\u7ef4\u62a4\u4f9d\u8d56\u7684\u5217\u8868<\/strong>\uff0c\u5982\u679c\u4fa6\u542c\u5668\u6240\u4f9d\u8d56\u7684\u6570\u636e\u5f88\u591a\uff0c\u5219\u7ef4\u62a4\u4f9d\u8d56\u5217\u8868\u7684\u6210\u672c\u4f1a\u5f88\u9ad8\uff0c\u4f8b\u5982\uff1a<\/p>\n
                        <body>\n  <div id="app">\n    <input type="text" v-model="p1">\n    <input type="text" v-model="p2">\n    <input type="text" v-model="p3">\n  <\/div>\n\n  <script src=".\/vue3.global.js"><\/script>\n  <script>\n    const { createApp, ref, watch } = Vue\n\n    const app = createApp({\n      setup() {\n        const p1 = ref('')\n        const p2 = ref('')\n        const p3 = ref('')\n        const baseUrl = 'https:\/\/api.liulongbin.top\/v1\/common\/get'\n\n        watch([p1, p2, p3], () => {\n          fetch(`${baseUrl}?params1=${p1.value}&params2=${p2.value}&params3=${p3.value}`)\n            .then(res => res.json())\n            .then(result => console.log(result.data))\n        })\n\n        return {\n          p1,\n          p2,\n          p3\n        }\n      }\n    })\n\n    app.mount('#app')\n  <\/script>\n<\/body><\/code><\/pre>\n
                        \u6211\u4eec\u53d1\u73b0\uff0c\u53ea\u8981 p1<\/code>, p2<\/code>, p3<\/code> \u4efb\u4f55\u4e00\u4e2a\u53d1\u751f\u53d8\u5316\uff0c\u90fd\u4f1a\u89e6\u53d1 watch \u7684\u56de\u8c03\u51fd\u6570\uff0c\u800c\u5728\u56de\u8c03\u51fd\u6570\u4e2d\uff0c\u6211\u4eec\u53c8\u628a\u8fd93\u4e2a\u6570\u636e\u5f53\u505a\u8c03\u7528\u63a5\u53e3\u7684\u53c2\u6570<\/strong>\u3002<\/p>\n
                        \u5728\u4f7f\u7528 watch \u7684\u65f6\u5019\uff0c\u6211\u4eec\u4e0d\u5f97\u4e0d\u7ef4\u62a4\u4e00\u4e2a [p1, p2, p3]<\/code> \u7684\u6570\u7ec4\uff0c\u4ece\u800c\u660e\u786e\u544a\u8bc9 watch \u8981\u4fa6\u542c\u54ea\u4e9b\u6570\u636e\u7684\u53d8\u5316<\/strong>\u3002\u5982\u679c\u8981\u4fa6\u542c\u7684\u6570\u636e\u9879\u5f88\u591a\uff0c\u5219\u6bcf\u6b21\u6dfb\u52a0\u6216\u5220\u9664\u4e86\u8c03\u7528\u63a5\u53e3\u7684\u53c2\u6570\u65f6\uff0c\u90fd\u9700\u8981\u624b\u52a8\u7ef4\u62a4\u8fd9\u4e2a\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\uff0c\u975e\u5e38\u7684\u9ebb\u70e6\u3002<\/p>\n
                        \u4f8b\u5982\uff1a\u4e0b\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c\u5fd8\u8bb0\u4e86\u628a p4<\/code> \u6dfb\u52a0\u5230\u4fa6\u542c\u5668\u7684\u4f9d\u8d56\u6570\u7ec4\u4e2d\uff0c\u6700\u7ec8\u5bfc\u81f4 p4<\/code> \u53d8\u5316\u65f6\uff0c\u65e0\u6cd5\u89e6\u53d1\u4fa6\u542c\u5668\u7684\u6267\u884c\uff1a<\/p>\n
                        \/\/ 2. \u4f46\u662f\uff0c\u5374\u5fd8\u8bb0\u4e86\u628a p4 \u6dfb\u52a0\u5230\u4fa6\u542c\u7684\u5217\u8868\u4e2d\n\/\/ \u5bfc\u81f4\u7684\u95ee\u9898\u662f\uff1a\u54ea\u6015\u4fee\u6539\u4e86 p4 \u7684\u503c\uff0c\u4e5f\u4e0d\u4f1a\u89e6\u53d1\u4fa6\u542c\u5668\u7684\u6267\u884c\nwatch([p1, p2, p3], () => {\n  \/\/ 1. \u5728\u56de\u8c03\u51fd\u6570\u4e2d\uff0c\u6211\u4eec\u628a p1, p2, p3, p4 \u5f53\u505a\u8bf7\u6c42\u53c2\u6570\n  fetch(`${baseUrl}?params1=${p1.value}&params2=${p2.value}&params3=${p3.value}&params4=${p4.value}`)\n    .then(res => res.json())\n    .then(result => console.log(result.data))\n})<\/code><\/pre>\n
                        2. watchEffect()<\/h3>\n
                        \u4e3a\u4e86\u8ba9\u7528\u6237\u4e0d\u5fc5\u7ef4\u62a4\u4fa6\u542c\u5668\u7684\u4f9d\u8d56\u6570\u7ec4\uff0cVue3 \u63d0\u4f9b\u4e86 watchEffect()<\/code> \u51fd\u6570\uff0c\u5b83\u4f1a\u81ea\u52a8\u6536\u96c6<\/strong>\u54cd\u5e94\u5f0f\u6570\u636e\u7684\u4f9d\u8d56\u5173\u7cfb<\/strong>\uff0c\u4f8b\u5982\uff1a<\/p>\n
                        watchEffect(() => {\n  \/\/ 1. \u5728\u56de\u8c03\u51fd\u6570\u4e2d\uff0c\u6211\u4eec\u628a p1, p2, p3, p4 \u5f53\u505a\u8bf7\u6c42\u53c2\u6570\n  fetch(`${baseUrl}?params1=${p1.value}&params2=${p2.value}&params3=${p3.value}&params4=${p4.value}`)\n    .then(res => res.json())\n    .then(result => console.log(result.data))\n})<\/code><\/pre>\n
                        \u53e6\u5916\uff0cwatchEffect()<\/code> \u4e2d\u7684\u56de\u8c03\u51fd\u6570\u4f1a\u7acb\u5373\u6267\u884c<\/strong>\uff0c\u56e0\u6b64\u4e0d\u9700\u8981\u6307\u5b9a immediate: true<\/code>\u3002<\/p>\n
                        \u5728\u7b2c\u4e00\u6b21\u6267\u884c\u671f\u95f4\uff0c\u4ed6\u4f1a\u81ea\u52a8\u6536\u96c6 p1.value<\/code>, p2.value<\/code>, p3.value<\/code>, p4.value<\/code> \u4f5c\u4e3a\u4f9d\u8d56\u3002<\/p>\n
                        \u6bcf\u5f53\u4efb\u4f55\u4e00\u4e2a\u54cd\u5e94\u5f0f\u6570\u636e\u53d1\u751f\u53d8\u5316\u65f6\uff0c\u56de\u8c03\u51fd\u6570\u4f1a\u518d\u6b21\u6267\u884c\u3002<\/p>\n
                        \u56e0\u6b64 watchEffect<\/code> \u8ba9\u6211\u4eec\u4e0d\u7528\u518d\u660e\u786e\u4f20\u9012<\/strong>\u89e6\u53d1\u56de\u8c03\u6267\u884c\u7684\u4f9d\u8d56\u9879<\/strong>\u3002<\/p>\n
                        3. watch() vs watchEffect()<\/h3>\n
                        \u76f8\u540c\u70b9\uff1a<\/strong><\/p>\n
                        watch \u548c watchEffect \u90fd\u80fd\u4fa6\u542c\u54cd\u5e94\u5f0f\u6570\u636e\u7684\u53d8\u5316\uff0c\u5e76\u91cd\u65b0\u6267\u884c\u7ed9\u5b9a\u7684\u56de\u8c03\u51fd\u6570\u3002<\/p>\n
                        \u4e0d\u540c\u70b9\uff1a<\/strong><\/p>\n
                          \n
                        • watch \u53ea\u4fa6\u542c\u660e\u786e\u7ed9\u5b9a\u7684\u4f9d\u8d56\u9879<\/strong>\uff0c\u4ece\u800c\u89e6\u53d1\u56de\u8c03\u51fd\u6570\u7684\u91cd\u65b0\u6267\u884c\n
                            \n
                          • \u4f18\u70b9\uff1a\u6211\u4eec\u53ef\u4ee5\u6839\u636e watch \u7684\u4f9d\u8d56\u9879\u5217\u8868<\/strong>\uff0c\u6e05\u695a\u5730\u77e5\u9053\u54ea\u4e9b\u4f9d\u8d56\u9879\u4f1a\u89e6\u53d1 watch \u56de\u8c03\u7684\u6267\u884c<\/strong><\/li>\n
                          • \u7f3a\u70b9\uff1a\u5fc5\u987b\u624b\u52a8\u7ef4\u62a4\u4f9d\u8d56\u9879\u5217\u8868<\/strong>\uff0c\u5f53\u4f9d\u8d56\u9879\u591a\u4e86\u4ee5\u540e\uff0c\u7ef4\u62a4\u8d77\u6765\u5f88\u9ebb\u70e6<\/li>\n<\/ul>\n<\/li>\n
                          • watchEffect \u4f1a\u5728\u56de\u8c03\u51fd\u6570\u7b2c\u4e00\u6b21\u6267\u884c<\/strong>\u7684\u65f6\u5019\u81ea\u52a8\u6536\u96c6\u54cd\u5e94\u5f0f\u6570\u636e\u7684\u4f9d\u8d56\u5173\u7cfb<\/strong>\n
                              \n
                            • \u4f18\u70b9\uff1a\u7701\u53bb\u4e86\u624b\u52a8\u7ef4\u62a4\u4f9d\u8d56\u9879\u5217\u8868\u7684\u8fc7\u7a0b\uff0c\u80fd\u8ba9\u4ee3\u7801\u66f4\u7b80\u6d01<\/li>\n
                            • \u7f3a\u70b9\uff1a\u54cd\u5e94\u5f0f\u4f9d\u8d56\u5173\u7cfb\u4e0d\u660e\u786e<\/strong>\uff0c\u65e0\u6cd5\u4e00\u773c\u786e\u5b9a\u54ea\u4e9b\u4f9d\u8d56\u9879\u4f1a\u89e6\u53d1\u56de\u8c03\u51fd\u6570\u7684\u6267\u884c<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
                              4. \u7c7b\u4e0e\u6837\u5f0f\u7ed1\u5b9a<\/h1>\n
                              4.1 \u7ed1\u5b9a HTML \u7684 class<\/h2>\n
                              \u6bcf\u4e2a HTML \u5143\u7d20\u90fd\u652f\u6301\u4f7f\u7528 class \u5c5e\u6027\u6765\u7f8e\u5316\u5143\u7d20\u7684\u6837\u5f0f\uff0c\u56e0\u6b64 v-bind \u6307\u4ee4\u540c\u6837\u9002\u7528\u4e8e\u5143\u7d20\u7684 class \u5c5e\u6027\uff0c\u6211\u4eec\u53ef\u4ee5\u4e3a class \u52a8\u6001\u7ed1\u5b9a\u7c7b\u540d\uff0c\u4ece\u800c\u8fbe\u5230\u52a8\u6001\u4fee\u6539\u5143\u7d20\u6837\u5f0f\u7684\u76ee\u7684\u3002<\/p>\n
                              \u4e3a\u4e86\u6f14\u793a\u5982\u4f55\u7ed1\u5b9a HTML \u7684 class\uff0c\u6211\u4eec\u5148\u5b9a\u4e49\u5982\u4e0b\u7684\u4e00\u7ec4 class \u6837\u5f0f\uff1a<\/p>\n
                              .red {\n  color: red; \/* \u7ea2\u8272\u6587\u5b57 *\/\n}\n\n.bgyellow {\n  background-color: yellow; \/* \u9ec4\u8272\u80cc\u666f *\/\n}\n\n.thin {\n  font-weight: 200; \/* \u6587\u5b57\u7c97\u7ec6 200 *\/\n}\n\n.fat {\n  font-weight: 900; \/* \u6587\u5b57\u7c97\u7ec6 900 *\/\n}\n\n.big {\n  font-size: 100px; \/* \u6587\u5b57\u5927\u5c0f 100px *\/\n}\n\n.small {\n  font-size: 12px; \/* \u6587\u5b57\u5927\u5c0f 12px *\/\n}<\/code><\/pre>\n
                              1. \u7ed1\u5b9a\u5355\u4e2a class<\/h3>\n
                              \u5b9a\u4e49 ref \u54cd\u5e94\u5f0f\u6570\u636e cname<\/code> \u5e76\u628a\u5b83\u66b4\u9732\u7ed9\u6a21\u677f\uff1a<\/p>\n
                              setup() {\n  \/\/ \u8981\u7ed1\u5b9a\u7ed9\u5143\u7d20\u7684 class \u7c7b\u540d\n  const cname = ref('')\n\n  \/\/ \u66b4\u9732\u7ed9\u6a21\u677f\u4f7f\u7528\n  return {\n    cname\n  }\n}<\/code><\/pre>\n
                              \u5728\u6a21\u677f\u4e2d\uff0c\u901a\u8fc7 :class="cname"<\/code> \u4e3a\u5143\u7d20\u52a8\u6001\u7ed1\u5b9a class \u7c7b\u540d\uff1a<\/p>\n
                              <h1 class="big" :class="cname">\u8fd9\u662f\u4e00\u4e2a\u5927\u6807\u9898<\/h1><\/code><\/pre>\n
                              \u70b9\u51fb button \u6309\u94ae\u65f6\uff0c\u7ed9 cname<\/code> \u8d4b\u503c\uff1a<\/p>\n
                              <button @click="cname='red'">\u7ea2\u8272<\/button><\/code><\/pre>\n
                              \n
                              \u6ce8\u610f\uff1a\u5728\u7ed9\u5143\u7d20\u63d0\u4f9b class \u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u628a\u9759\u6001 class<\/strong> \u548c\u52a8\u6001\u7ed1\u5b9a\u7684 class<\/strong> \u5206\u522b\u5e94\u7528\u4e8e\u540c\u4e00\u4e2a\u5143\u7d20\u3002<\/p>\n<\/blockquote>\n
                              2. \u52a8\u6001\u5207\u6362\u5355\u4e2a class<\/h3>\n
                              \u9700\u6c42\uff1a\u70b9\u51fb\u6309\u94ae\uff0c\u52a8\u6001\u4e3a\u5143\u7d20\u5207\u6362 thin<\/code> \u548c fat<\/code> \u7684 class \u7c7b\u540d\u3002<\/p>\n
                              \u9996\u5148\uff0c\u5b9a\u4e49\u5e03\u5c14\u503c flag<\/code> \u5e76\u66b4\u9732\u7ed9\u6a21\u677f\u4f7f\u7528\uff1a<\/p>\n
                              setup() {\n  \/\/ \u5b9a\u4e49 ref \u7c7b\u578b\u7684\u5e03\u5c14\u503c\n  const flag = ref(false)\n\n  \/\/ \u66b4\u9732\u7ed9\u6a21\u677f\u4f7f\u7528\n  return {\n    flag\n  }\n}<\/code><\/pre>\n
                              \u5176\u6b21\uff0c\u5b9e\u73b0\u70b9\u51fb\u6309\u94ae\u63a7\u5236\u5e03\u5c14\u503c\u7684\u5207\u6362\uff1a<\/p>\n
                              <button @click="flag = !flag">Toggle<\/button><\/code><\/pre>\n
                              \u6700\u540e\uff0c\u6839\u636e\u5e03\u5c14\u503c\u7684\u72b6\u6001\uff0c\u4e3a\u5143\u7d20\u52a8\u6001\u7ed1\u5b9a class \u7c7b\u540d\uff1a<\/p>\n
                              <h1 class="big" :class="flag ? 'thin' : 'fat'">\u8fd9\u662f\u4e00\u4e2a\u5927\u6807\u9898<\/h1><\/code><\/pre>\n
                              \n
                              \u6ce8\u610f\uff1a\u8fd9\u91cc\u7528\u5230\u4e86\u4e09\u5143\u8868\u8fbe\u5f0f\uff0c\u4e3a\u4e86\u6a21\u677f\u5185\u5bb9\u7684\u7b80\u6d01\uff0c\u6211\u4eec\u4e5f\u53ef\u4ee5\u628a\u4e09\u5143\u8868\u8fbe\u5f0f\u5c01\u88c5\u4e3a computed \u8ba1\u7b97\u5c5e\u6027\u3002<\/p>\n<\/blockquote>\n
                              3. \u57fa\u4e8e\u8ba1\u7b97\u5c5e\u6027\u52a8\u6001\u5207\u6362\u5355\u4e2a class<\/h3>\n
                              \u5b9a\u4e49 cname<\/code> \u7684\u8ba1\u7b97\u5c5e\u6027\uff1a<\/p>\n
                              setup() {\n  \/\/ \u5b9a\u4e49 ref \u7c7b\u578b\u7684\u5e03\u5c14\u503c\n  const flag = ref(false)\n  \/\/ \u57fa\u4e8e flag.value \u7684\u503c\u52a8\u6001\u8ba1\u7b97\u8981\u5e94\u7528\u7ed9\u5143\u7d20\u7684 class \u540d\n  const cname = computed(() => flag.value ? 'thin' : 'fat')\n\n  \/\/ \u66b4\u9732\u7ed9\u6a21\u677f\u4f7f\u7528\n  return {\n    flag,\n    cname\n  }\n}<\/code><\/pre>\n
                              \u5728\u6a21\u677f\u4e2d\u628a cname<\/code> \u52a8\u6001\u7ed1\u5b9a\u4e3a\u5143\u7d20\u7684 class<\/code>\uff1a<\/p>\n
                              <div id="app">\n  <h1 class="big" :class="cname">\u8fd9\u662f\u4e00\u4e2a\u5927\u6807\u9898<\/h1>\n  <button @click="flag = !flag">Toggle<\/button>\n<\/div><\/code><\/pre>\n
                              4. \u7ed1\u5b9a class \u5bf9\u8c61<\/h3>\n
                              \u4e3a\u5143\u7d20\u52a8\u6001\u7ed1\u5b9a class \u5bf9\u8c61\uff0c\u53ef\u4ee5\u63a7\u5236\u5207\u6362\u5143\u7d20\u7684\u591a\u4e2a class\uff0c\u5b83\u7684\u8bed\u6cd5\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n
                              <!-- \u5f53\u201c\u5e03\u5c14\u503c1\u201d\u4e3a true \u65f6\uff0c\u4f1a\u7ed9\u5143\u7d20\u5e94\u7528\u201c\u7c7b\u540dA\u201d\uff0c\u5426\u5219\u4f1a\u79fb\u9664\u5143\u7d20\u4e0a\u7684\u201c\u7c7b\u540dA\u201d -->\n<!-- \u5f53\u201c\u5e03\u5c14\u503c2\u201d\u4e3a true \u65f6\uff0c\u4f1a\u7ed9\u5143\u7d20\u5e94\u7528\u201c\u7c7b\u540dB\u201d\uff0c\u5426\u5219\u4f1a\u79fb\u9664\u5143\u7d20\u4e0a\u7684\u201c\u7c7b\u540dB\u201d -->\n<h1 :class="{\u7c7b\u540dA: \u5e03\u5c14\u503c1, \u7c7b\u540dB: \u5e03\u5c14\u503c2}">\u8fd9\u662f\u4e00\u4e2a\u5927\u6807\u9898<\/h1><\/code><\/pre>\n
                              \u4f8b\u5982\u4e0b\u9762\u7684\u4f8b\u5b50\uff1a<\/p>\n
                              \u5b9a\u4e49 ref \u7c7b\u578b\u7684\u54cd\u5e94\u5f0f\u6570\u636e isRed<\/code> \u548c isBgYellow<\/code>\uff0c\u5b83\u4eec\u7684\u9ed8\u8ba4\u503c\u4e3a\u4e3a\u5e03\u5c14\u503c false<\/code>\uff1a<\/p>\n
                              setup() {\n  \/\/ 1. \u5b9a\u4e49 ref \u7c7b\u578b\u7684\u54cd\u5e94\u5f0f\u6570\u636e\n  const isRed = ref(false)\n  const isBgYellow = ref(false)\n\n  \/\/ 2. \u66b4\u9732\u7ed9\u6a21\u677f\u4f7f\u7528\n  return {\n    isRed,\n    isBgYellow\n  }\n}<\/code><\/pre>\n
                              \u5728\u6a21\u677f\u4e2d\uff0c\u70b9\u51fb\u6309\u94ae\u5207\u6362\u8fd9\u4e24\u4e2a\u5e03\u5c14\u503c\u7684\u72b6\u6001\uff1a<\/p>\n
                              <button @click="isRed = !isRed">Toggle Color<\/button>\n<button @click="isBgYellow = !isBgYellow">Toggle Background Color<\/button><\/code><\/pre>\n
                              \u5728\u6a21\u677f\u4e2d\uff0c\u4e3a h1<\/code> \u5143\u7d20\u7ed1\u5b9a class \u5bf9\u8c61\uff1a<\/p>\n
                              <h1 class="big" :class="{red: isRed, bgyellow: isBgYellow}">\u8fd9\u662f\u4e00\u4e2a\u5927\u6807\u9898<\/h1><\/code><\/pre>\n
                              5. \u628a class \u5bf9\u8c61\u5c01\u88c5\u4e3a reactive \u54cd\u5e94\u5f0f\u6570\u636e<\/h3>\n
                              \u4e3a\u4e86\u7b80\u5316\u6a21\u677f\u4e2d\u7684\u4ee3\u7801\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u628a\u52a8\u6001\u7ed1\u5b9a\u7684 class \u5bf9\u8c61\uff0c\u5c01\u88c5\u4e3a reactive<\/code> \u7c7b\u578b\u7684\u54cd\u5e94\u5f0f\u6570\u636e\u5bf9\u8c61\uff1a<\/p>\n
                              setup() {\n  \/\/ 1. \u5b9a\u4e49 reactive \u7c7b\u578b\u7684\u54cd\u5e94\u5f0f\u6570\u636e\n  const classObj = reactive({\n    red: false,\n    bgyellow: false\n  })\n\n  \/\/ 2. \u66b4\u9732\u7ed9\u6a21\u677f\u4f7f\u7528\n  return {\n    classObj\n  }\n}<\/code><\/pre>\n
                              \u5728\u6a21\u677f\u4e2d\uff0c\u4e3a h1<\/code> \u5143\u7d20\u7ed1\u5b9a class<\/code> \u5bf9\u8c61\uff1a<\/p>\n
                              <h1 class="big" :class="classObj">\u8fd9\u662f\u4e00\u4e2a\u5927\u6807\u9898<\/h1><\/code><\/pre>\n
                              \u5e76\u4e14\u5728\u70b9\u51fb\u6309\u94ae\u7684\u65f6\u5019\uff0c\u52a8\u6001\u5207\u6362 classObj.red<\/code> \u548c classObj.bgyellow<\/code> \u7684\u5e03\u5c14\u503c\uff0c\u4ece\u800c\u51b3\u5b9a\u662f\u5426\u628a class \u7c7b\u540d\u5e94\u7528\u7ed9\u5143\u7d20\uff1a<\/p>\n
                              <button @click="classObj.red = !classObj.red">Toggle Color<\/button>\n<button @click="classObj.bgyellow = !classObj.bgyellow">Toggle Background Color<\/button><\/code><\/pre>\n
                              6. \u628a class \u5bf9\u8c61\u5c01\u88c5\u4e3a computed \u8ba1\u7b97\u5c5e\u6027<\/h3>\n
                              \u9664\u4e86\u53ef\u4ee5\u628a\u52a8\u6001\u7ed1\u5b9a\u7684 class \u5bf9\u8c61\u5c01\u88c5\u4e3a reactive<\/code> \u7c7b\u578b\u7684\u54cd\u5e94\u5f0f\u6570\u636e\u4e4b\u5916\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u628a\u5b83\u5c01\u88c5\u4e3a computed \u8ba1\u7b97\u5c5e\u6027\uff0c\u8fd9\u4e5f\u80fd\u7b80\u5316\u6a21\u677f\u4e2d\u7ed1\u5b9a class \u7684\u4ee3\u7801\uff1a<\/p>\n
                              setup() {\n  \/\/ 1. \u5b9a\u4e49 ref \u7c7b\u578b\u7684\u54cd\u5e94\u5f0f\u6570\u636e\n  const isRed = ref(false)\n  const isBgYellow = ref(false)\n\n  \/\/ 2. \u5b9a\u4e49\u8ba1\u7b97\u5c5e\u6027\n  const classObj = computed(() => ({\n    red: isRed.value,\n    bgyellow: isBgYellow.value\n  }))\n\n  \/\/ 3. \u66b4\u9732\u7ed9\u6a21\u677f\u4f7f\u7528\n  return {\n    classObj,\n    isRed,\n    isBgYellow\n  }\n}<\/code><\/pre>\n
                              \u5728\u6a21\u677f\u4e2d\uff0c\u4e3a h1<\/code> \u5143\u7d20\u52a8\u6001\u7ed1\u5b9a class<\/code> \u5bf9\u8c61\uff1a<\/p>\n
                              <h1 class="big" :class="classObj">\u8fd9\u662f\u4e00\u4e2a\u5927\u6807\u9898<\/h1><\/code><\/pre>\n
                              \u70b9\u51fb\u6309\u94ae\u65f6\uff0c\u52a8\u6001\u5207\u6362\u5e03\u5c14\u503c\u7684\u72b6\u6001\uff1a<\/p>\n
                              <button @click="isRed = !isRed">Toggle Color<\/button>\n<button @click="isBgYellow = !isBgYellow">Toggle Background Color<\/button><\/code><\/pre>\n
                              7. \u7ed1\u5b9a class \u6570\u7ec4<\/h3>\n
                              \u6211\u4eec\u53ef\u4ee5\u4e3a class \u7ed1\u5b9a\u6570\u7ec4\uff0c\u4ece\u800c\u4e3a\u5143\u7d20\u5e94\u7528\u591a\u4e2a class\uff1a<\/p>\n
                              <h1 class="big" :class="['thin', 'red', 'bgyellow']">\u8fd9\u662f\u4e00\u4e2a\u5927\u6807\u9898<\/h1><\/code><\/pre>\n
                              \u4e5f\u53ef\u4ee5\u901a\u8fc7\u4e09\u5143\u8868\u8fbe\u5f0f\uff0c\u52a8\u6001\u63a7\u5236\u67d0\u4e2a class\uff1a<\/p>\n
                              <h1 class="big" :class="['thin', 'red', flag ? 'bgyellow' : '']">\u8fd9\u662f\u4e00\u4e2a\u5927\u6807\u9898<\/h1><\/code><\/pre>\n
                              \u8fd8\u53ef\u4ee5\u628a\u4e09\u5143\u8868\u8fbe\u5f0f\u6539\u9020\u6210\u5bf9\u8c61\u7684\u5f62\u5f0f\uff0c\u6309\u9700\u4e3a\u5143\u7d20\u5e94\u7528 class\uff1a<\/p>\n
                              <h1 class="big" :class="['thin', 'red', {bgyellow: flag}]">\u8fd9\u662f\u4e00\u4e2a\u5927\u6807\u9898<\/h1><\/code><\/pre>\n
                              \u4e3a\u4e86\u8fdb\u4e00\u6b65\u7b80\u5316\u6a21\u677f\u4e2d\u7684\u4ee3\u7801\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u628a\u6570\u7ec4\u5c01\u88c5\u4e3a computed \u8ba1\u7b97\u5c5e\u6027\uff1a<\/p>\n
                              setup() {\n  \/\/ 1. ref \u7c7b\u578b\u7684\u5e03\u5c14\u503c\n  const flag = ref(false)\n  \/\/ 2. \u8ba1\u7b97\u5c5e\u6027\uff1a\u8981\u5e94\u7528\u7ed9\u5143\u7d20\u7684\u6837\u5f0f\u6570\u7ec4\n  const classArr = computed(() => ['thin', 'red', { bgyellow: flag.value }])\n\n  \/\/ 3. \u66b4\u9732\u7ed9\u6a21\u677f\u4f7f\u7528\n  return {\n    flag,\n    classArr\n  }\n}<\/code><\/pre>\n
                              \u7136\u540e\uff0c\u53ea\u9700\u8981\u4e3a\u5143\u7d20\u7684 class \u7ed1\u5b9a\u8fd9\u4e2a\u8ba1\u7b97\u5c5e\u6027\u5373\u53ef\uff1a<\/p>\n
                              <h1 class="big" :class="classArr">\u8fd9\u662f\u4e00\u4e2a\u5927\u6807\u9898<\/h1><\/code><\/pre>\n
                              4.2 \u7ed1\u5b9a style \u5185\u8054\u6837\u5f0f<\/h2>\n
                              1. \u7ed1\u5b9a\u5bf9\u8c61<\/h3>\n
                              :style<\/code> \u652f\u6301\u7ed1\u5b9a JavaScript \u7684\u5bf9\u8c61\u503c\u3002\u4f8b\u5982\uff0c\u5b9a\u4e49\u4e00\u4e2a ref \u7c7b\u578b\u7684\u54cd\u5e94\u5f0f\u6570\u636e\uff1a<\/p>\n
                              setup() {\n  \/\/ 1. \u5b9a\u4e49 ref \u7c7b\u578b\u7684\u54cd\u5e94\u5f0f\u6570\u636e\n  const fs = ref(12)\n\n  \/\/ 2. \u628a\u6570\u636e\u66b4\u9732\u7ed9\u6a21\u677f\u4f7f\u7528\n  return {\n    fs\n  }\n}<\/code><\/pre>\n
                              \u5728\u6a21\u677f\u4e2d\u4e3a h1<\/code> \u7ed1\u5b9a style \u6837\u5f0f\u5bf9\u8c61\uff1a<\/p>\n
                              <div id="app">\n  <input type="number" v-model="fs">\n  <!-- \u52a8\u6001\u7ed1\u5b9a style \u6837\u5f0f\u5bf9\u8c61 -->\n  <h1 :style="{color: 'red', fontSize: fs + 'px'}">\u8fd9\u662f\u4e00\u4e2a\u5927\u6807\u9898<\/h1>\n<\/div><\/code><\/pre>\n
                              \n
                              \u6ce8\u610f\uff1a\u5982\u679c\u662f\u8fde\u5b57\u7b26<\/strong>\u683c\u5f0f\u7684\u6837\u5f0f\u5c5e\u6027\uff0c\u63a8\u8350\u5199\u6210\u5c0f\u9a7c\u5cf0<\/strong>\u7684\u5f62\u5f0f\u3002<\/p>\n<\/blockquote>\n
                              2. \u7ed1\u5b9a\u8ba1\u7b97\u5c5e\u6027<\/h3>\n
                              \u4e3a\u4e86\u4fdd\u8bc1\u6a21\u677f\u7684\u7b80\u6d01\uff0c\u6211\u4eec\u53ef\u4ee5\u628a\u7ed1\u5b9a\u7ed9 style \u7684\u6837\u5f0f\u5bf9\u8c61\uff0c\u5c01\u88c5\u4e3a computed \u8ba1\u7b97\u5c5e\u6027\uff1a<\/p>\n
                              setup() {\n  const fs = ref(12)\n  \/\/ 1. \u5b9a\u4e49\u8ba1\u7b97\u5c5e\u6027\n  const styleObj = computed(() => ({ color: 'red', fontSize: fs.value + 'px' }))\n\n  \/\/ 2. \u628a\u6570\u636e\u66b4\u9732\u7ed9\u6a21\u677f\u4f7f\u7528\n  return {\n    fs,\n    styleObj\n  }\n}<\/code><\/pre>\n
                              \u5728\u6a21\u677f\u4e2d\uff0c\u76f4\u63a5\u4f7f\u7528\u8ba1\u7b97\u5c5e\u6027\uff1a<\/p>\n
                              <div id="app">\n  <input type="number" v-model="fs">\n  <!-- \u52a8\u6001\u7ed1\u5b9a style \u6837\u5f0f\u5bf9\u8c61 -->\n  <h1 :style="styleObj">\u8fd9\u662f\u4e00\u4e2a\u5927\u6807\u9898<\/h1>\n<\/div><\/code><\/pre>\n
                              3. \u7ed1\u5b9a\u6570\u7ec4<\/h3>\n
                              \u6211\u4eec\u8fd8\u53ef\u4ee5\u7ed9 :style<\/code> \u7ed1\u5b9a\u4e00\u4e2a\u5305\u542b\u591a\u4e2a\u6837\u5f0f\u5bf9\u8c61\u7684\u6570\u7ec4<\/strong>\u3002\u8fd9\u4e9b\u5bf9\u8c61\u4f1a\u88ab\u5408\u5e76\u540e\u6e32\u67d3\u5230\u540c\u4e00\u5143\u7d20\u4e0a\u3002\u4f8b\u5982\uff0c\u58f0\u660e\u5982\u4e0b\u7684\u4e24\u4e2a style \u6837\u5f0f\u5bf9\u8c61\uff1a<\/p>\n
                              setup() {\n  const fs = ref(12)\n  \/\/ 1. \u5b9a\u4e49\u8ba1\u7b97\u5c5e\u6027\n  const styleObj = computed(() => ({ color: 'red', fontSize: fs.value + 'px' }))\n  \/\/ 2. \u5b9a\u4e49 style \u7684\u6837\u5f0f\u5bf9\u8c61\n  const styleObj2 = computed(() => ({ fontWeight: 200, backgroundColor: 'yellow' }))\n\n  \/\/ 3. \u628a\u6570\u636e\u66b4\u9732\u7ed9\u6a21\u677f\u4f7f\u7528\n  return {\n    fs,\n    styleObj,\n    styleObj2\n  }\n}<\/code><\/pre>\n
                              \u628a styleObj<\/code> \u548c styleObj2<\/code> \u4ee5\u6570\u7ec4\u7684\u5f62\u5f0f\uff0c\u7ed1\u5b9a\u4e3a h1<\/code> \u7684 style<\/code> \u6837\u5f0f\uff1a<\/p>\n
                              <h1 :style="[styleObj, styleObj2]">\u8fd9\u662f\u4e00\u4e2a\u5927\u6807\u9898<\/h1><\/code><\/pre>\n
                              5. \u6a21\u677f\u5f15\u7528<\/h1>\n
                              \u867d\u7136 Vue \u7684\u58f0\u660e\u6027\u6e32\u67d3\u6a21\u578b\u4e3a\u4f60\u62bd\u8c61\u4e86\u5927\u90e8\u5206\u5bf9 DOM \u7684\u76f4\u63a5\u64cd\u4f5c\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u4ecd\u7136\u9700\u8981\u76f4\u63a5\u8bbf\u95ee\u5e95\u5c42 DOM \u5143\u7d20\u3002\u8981\u5b9e\u73b0\u8fd9\u4e00\u70b9\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u7279\u6b8a\u7684 ref<\/code> attribute\uff1a<\/p>\n
                              <input ref="input"><\/code><\/pre>\n
                              5.1 \u8bbf\u95ee\u6a21\u677f\u5f15\u7528<\/h2>\n
                              \u90a3\u4e48\uff0c\u5728 JS \u4e2d\u5982\u4f55\u624d\u80fd\u591f\u8bbf\u95ee\u5230\u6a21\u677f\u4e2d\u7684\u5143\u7d20\u5462\uff1f\u8fd9\u5c31\u9700\u8981\u6211\u4eec\u4f7f\u7528 ref()<\/code> \u51fd\u6570\u58f0\u660e\u4e00\u4e2a\u540c\u540d\u7684\u54cd\u5e94\u5f0f\u6570\u636e\uff1a<\/p>\n
                              setup() {\n  \/\/ 1. \u5b9a\u4e49\u540c\u540d\u7684 ref \u6570\u636e\n  const input = ref(null)\n\n  watchEffect(() => {\n    if (input.value) {\n      \/\/ 3. \u5982\u679c input.value \u6709\u503c\uff0c\u5219\u8c03\u7528 DOM \u7684 focus \u51fd\u6570\u8ba9\u5176\u83b7\u53d6\u7126\u70b9\n      input.value.focus()\n    }\n  })\n\n  \/\/ 2. \u5e76\u628a ref \u6570\u636e\u66b4\u9732\u7ed9\u6a21\u677f\n  return {\n    input\n  }\n}<\/code><\/pre>\n
                              5.2 v-for \u4e2d\u7684\u6a21\u677f\u5f15\u7528<\/h2>\n
                              \u5f53\u5728 v-for<\/code> \u4e2d\u4f7f\u7528\u6a21\u677f\u5f15\u7528\u65f6\uff0c\u5bf9\u5e94\u7684 ref \u4e2d\u5305\u542b\u7684\u503c\u662f\u4e00\u4e2a\u6570\u7ec4\uff0c\u5b83\u5c06\u5728\u5143\u7d20\u88ab\u6302\u8f7d\u540e\u5305\u542b\u5bf9\u5e94\u6574\u4e2a\u5217\u8868\u7684\u6240\u6709\u5143\u7d20\uff1a<\/p>\n
                              \u7ed9 v-for<\/code> \u5faa\u73af\u751f\u6210\u7684 li \u6dfb\u52a0 ref<\/code> \u5c5e\u6027\uff1a<\/p>\n
                              <ul>\n  <li v-for="item in list" :key="item.id" ref="liRefs">{{ item.name }} --- {{item.age}}<\/li>\n<\/ul><\/code><\/pre>\n
                              \u5728 JS \u4e2d\u4f7f\u7528 ref()<\/code> \u51fd\u6570\u58f0\u660e\u540c\u540d\u7684\u6570\u636e\uff1a<\/p>\n
                              setup() {\n  \/\/ \u8981\u6e32\u67d3\u7684\u6570\u636e\n  const list = ref([\n    { id: 1, name: 'zs', age: 18 },\n    { id: 2, name: 'liulongbin', age: 19 },\n    { id: 3, name: 'escook', age: 22 }\n  ])\n\n  \/\/ 1. \u58f0\u660e\u540c\u540d\u7684 ref \u6570\u636e\n  const liRefs = ref([])\n\n  watchEffect(() => {\n    \/\/ 3. \u5faa\u73af\u6bcf\u4e2a DOM \u5143\u7d20\uff0c\u6839\u636e\u7d22\u5f15\u7684\u5947\u5076\u6027\uff0c\u4e3a DOM \u5143\u7d20\u8bbe\u7f6e\u5bf9\u5e94\u7684 color \u989c\u8272\n    liRefs.value.forEach((li, i) => li.style.color = i % 2 === 0 ? 'red' : 'blue')\n  })\n\n  return {\n    list,\n    \/\/ 2. \u5e76\u628a\u5b83\u66b4\u9732\u7ed9\u6a21\u677f\n    liRefs\n  }\n}<\/code><\/pre>\n
                              5.3 \u51fd\u6570\u6a21\u677f\u5f15\u7528<\/h2>\n
                              \u9664\u4e86\u4f7f\u7528\u5b57\u7b26\u4e32\u503c\u4f5c\u540d\u5b57\uff0cref<\/code> attribute \u8fd8\u53ef\u4ee5\u7ed1\u5b9a\u4e3a\u4e00\u4e2a\u51fd\u6570\uff0c\u4f1a\u5728\u6bcf\u6b21\u7ec4\u4ef6\u66f4\u65b0\u65f6\u90fd\u88ab\u8c03\u7528\u3002\u8be5\u51fd\u6570\u4f1a\u6536\u5230\u5143\u7d20\u5f15\u7528\u4f5c\u4e3a\u5176\u7b2c\u4e00\u4e2a\u53c2\u6570\uff1a<\/p>\n
                              <input :ref="(el) => { \/* \u5c06 el \u8d4b\u503c\u7ed9\u4e00\u4e2a\u6570\u636e\u5c5e\u6027\u6216 ref \u53d8\u91cf *\/ }"><\/code><\/pre>\n
                              \u6ce8\u610f\u6211\u4eec\u8fd9\u91cc\u9700\u8981\u4f7f\u7528\u52a8\u6001\u7684 :ref<\/code> \u7ed1\u5b9a\u624d\u80fd\u591f\u4f20\u5165\u4e00\u4e2a\u51fd\u6570\u3002\u5f53\u7ed1\u5b9a\u7684\u5143\u7d20\u88ab\u5378\u8f7d\u65f6\uff0c\u51fd\u6570\u4e5f\u4f1a\u88ab\u8c03\u7528\u4e00\u6b21\uff0c\u6b64\u65f6\u7684 el<\/code> \u53c2\u6570\u4f1a\u662f null<\/code>\u3002\u4f60\u5f53\u7136\u4e5f\u53ef\u4ee5\u7ed1\u5b9a\u4e00\u4e2a\u7ec4\u4ef6\u65b9\u6cd5\u800c\u4e0d\u662f\u5185\u8054\u51fd\u6570\u3002<\/p>\n
                              \u4f8b\u5982\uff0c\u5728\u5b9a\u4e49\u54cd\u5e94\u5f0f\u6570\u636e flag<\/code>\uff0c\u7528\u6765\u63a7\u5236\u9875\u9762\u4e0a input \u5143\u7d20\u7684\u663e\u793a\u548c\u9690\u85cf\uff1a <\/p>\n
                              setup() {\n  \/\/ \u5e03\u5c14\u503c\n  const flag = ref(true)\n  \/\/ \u628a\u6570\u636e\u66b4\u9732\u7ed9\u6a21\u677f\u4f7f\u7528\n  return {\n    flag\n  }\n}<\/code><\/pre>\n
                              \u5728\u6a21\u677f\u4e2d\uff0c\u901a\u8fc7\u70b9\u51fb\u6309\u94ae\uff0c\u5207\u6362 flag<\/code> \u7684\u503c\uff1a<\/p>\n
                              <!-- \u70b9\u51fb\u6309\u94ae\uff0c\u5207\u6362 flag \u7684\u503c -->\n<button @click="flag = !flag">Toggle<\/button><\/code><\/pre>\n
                              \u6700\u540e\uff0c\u4f7f\u7528 v-if<\/code> \u6307\u4ee4\u63a7\u5236 input \u7684\u663e\u793a\u548c\u9690\u85cf\uff0c\u5e76\u7ed9 input \u6dfb\u52a0\u51fd\u6570\u6a21\u677f\u5f15\u7528<\/strong>\uff1a<\/p>\n
                              <!-- \u4f7f\u7528 v-if \u6307\u4ee4\u63a7\u5236 input \u5143\u7d20\u7684\u663e\u793a\u548c\u9690\u85cf -->\n<!-- \u4f7f\u7528 :ref \u7ed1\u5b9a\u4e00\u4e2a\u51fd\u6570\uff0c\u5728\u51fd\u6570\u5185\u53ef\u4ee5\u83b7\u53d6\u5230 DOM \u7684\u5f15\u7528 -->\n<input v-if="flag" :ref="(el) => el && el.focus()"><\/code><\/pre>\n
                              \n
                              \u7248\u6743\u5f52\u4f5c\u8005 \u00a9\u5218\u9f99\u5bbe<\/strong> \u6240\u6709\uff0c\u672c\u6587\u7ae0\u672a\u7ecf\u4f5c\u8005\u5141\u8bb8\uff0c\u7981\u6b62\u79c1\u81ea\u8f6c\u8f7d\uff01<\/p>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"
                              \u7248\u6743\u5f52\u4f5c\u8005 \u00a9\u5218\u9f99\u5bbe \u6240\u6709\uff0c\u672c\u6587\u7ae0\u672a\u7ecf\u4f5c\u8005\u5141\u8bb8\uff0c\u7981\u6b62\u79c1\u81ea\u8f6c\u8f7d\uff01 1. setup \u51fd\u6570 & \u7ec4\u5408\u5f0f API \u5728\u524d\u9762\u7684\u8bfe\u7a0b\u4e2d\uff0c\u6211\u4eec\u66fe\u5f3a\u8c03\u8fc7\uff1a\u4f7f\u7528 data() \u51fd\u6570\u58f0\u660e\u54cd\u5e94\u5f0f\u7684\u6570\u636e\u3001\u5728 methods \u8282\u70b9\u4e0b\u58f0\u660e\u4e8b\u4ef6\u5904\u7406\u5668\uff0c\u90fd\u662f Vue2 \u4e2d\u7684\u65e7\u8bed\u6cd5\uff08\u9009\u9879\u5f0fAPI\uff09\u3002\u8fd9\u79cd\u65e7\u8bed\u6cd5\u7684\u5b58\u5728\uff0c\u4e3b\u8981\u662f\u4e3a\u4e86\u9632\u6b62\u65ad\u5d16\u5f0f\u5347\u7ea7\u9020\u6210\u7684\u8001\u7528\u6237\u6d41\u5931\u3002 \u5728 Vue3 \u4e2d\uff0c\u63a8\u51fa\u4e86\u7ec4\u5408\u5f0f API \u7684\u65b0\u6982\u5ff5\uff0c\u5b83\u53ef\u4ee5\u6781\u5927\u63d0\u9ad8\u529f\u80fd\u6a21\u5757\u7684\u5c01\u88c5\u6027\u548c\u590d\u7528\u6027\u3002\u56e0\u6b64\uff0c\u5b98\u65b9\u63a8\u8350\u6240\u6709\u7528\u6237\u4f18\u5148\u4f7f\u7528\u7ec4\u5408\u5f0f API\u3002 \u5728\u4eca\u540e\u7684\u5f00\u53d1\u4e2d\uff0c\u4e3a\u4e86\u7ef4\u62a4\u8001\u9879\u76ee\uff0c\u6211\u4eec\u53ef\u80fd\u4f1a\u4e0d\u5f97\u4e0d\u7528\u5230\u9009\u9879\u5f0f API\u3002\u9664\u6b64\u4e4b\u5916\uff0c\u5728\u5f00\u53d1\u65b0\u9879\u76ee\u65f6\uff0c\u63a8\u8350\u5927\u5bb6\u4f18\u5148\u4f7f\u7528\u7ec4\u5408\u5f0f API\u3002 1.1 setup \u51fd\u6570 setup() \u51fd\u6570\u662f Vue3 \u4e2d\u7ec4\u5408\u5f0f API \u7684\u5165\u53e3\uff0c\u5b83\u7684\u8bed\u6cd5\u683c\u5f0f\u5982\u4e0b\uff1a const { createApp } = Vue const app = createApp({ setup() { \/\/ \u7ed9\u6a21\u677f\u4f7f\u7528\u7684\u6570\u636e\u3001\u4e8b\u4ef6\u5904\u7406\u5668\u7b49\uff0c\u90fd\u8981\u901a\u8fc7\u8fd9\u4e2a return \u7684\u5bf9\u8c61\u66b4\u9732\u7ed9\u6a21\u677f return {} } }) app.mount('#app') \u4f8b\u5982\uff0c\u5728 setup return \u7684\u5bf9\u8c61\u4e2d\uff0c\u58f0\u660e\u4e00\u4e2a\u6570\u636e name\uff1a const { createApp } = Vue const app = createApp({ setup() { \/\/ \u7ed9\u6a21\u677f\u4f7f\u7528\u7684\u6570\u636e\u3001\u4e8b\u4ef6\u5904\u7406\u5668\u7b49\uff0c\u90fd\u8981\u901a\u8fc7\u8fd9\u4e2a return \u7684\u5bf9\u8c61\u66b4\u9732\u7ed9\u6a21\u677f return { name: 'liulongbin' } } }) app.mount('#app') \u7d27\u63a5\u7740\uff0c\u5728\u6a21\u677f\u4e2d\u5373\u53ef\u4f7f\u7528\u540d\u4e3a name \u7684\u6570\u636e\u4e86\uff1a <!– \u6a21\u677f –> <div id="app"> <h1>{{ name }}<\/h1> <\/div> \u6ce8\u610f\uff1a\u521a\u624d\u5b9a\u4e49\u7684 name\uff0c\u5e76\u975e\u662f\u54cd\u5e94\u5f0f\u7684\u6570\u636e\uff0c\u6240\u4ee5\u57fa\u4e8e app._instance.proxy.name \u4fee\u6539\u5b83\u7684\u503c\u540e\uff0c\u4e0d\u4f1a\u89e6\u53d1\u89c6\u56fe\u7684\u91cd\u65b0\u6e32\u67d3\u3002 1.2 \u7ec4\u5408\u5f0f API \u7ec4\u5408\u5f0f API \u662f Vue3 \u63d0\u4f9b\u7684\u4e00\u7cfb\u5217\u51fd\u6570\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528 reactive() \u548c ref() \u8fd9\u4e24\u4e2a\u51fd\u6570\uff0c\u6765\u58f0\u660e\u54cd\u5e94\u5f0f\u7684\u6570\u636e\u3002 1. reactive \u51fd\u6570 reactive \u51fd\u6570\u7528\u6765\u5b9a\u4e49\u54cd\u5e94\u5f0f\u7684\u6570\u636e\u5bf9\u8c61\uff0c\u5b83\u7684\u4f7f\u7528\u6b65\u9aa4\u5982\u4e0b\uff1a \/\/ 1. \u4ece Vue \u4e0a\u89e3\u6784\u51fa reactive \u51fd\u6570 const { createApp, reactive } = Vue const app = createApp({ setup() { \/\/ 2. \u8c03\u7528 reactive \u51fd\u6570\uff0c\u5b9a\u4e49\u54cd\u5e94\u5f0f\u7684\u6570\u636e const user = reactive({ name: 'zs' }) \/\/ 3. \u628a\u54cd\u5e94\u5f0f\u7684\u6570\u636e\uff0c\u6302\u8f7d\u5230 return \u7684\u5bf9\u8c61\u4e0a\uff0c\u4f9b\u6a21\u677f\u4f7f\u7528 return { user } } }) app.mount('#app') \u63a5\u4e0b\u6765\uff0c\u5c31\u53ef\u4ee5\u5728\u6a21\u677f\u4e2d\u4f7f\u7528\u54cd\u5e94\u5f0f\u7684\u6570\u636e user \u5566\uff1a <!– \u6a21\u677f –> <div id="app"> <h1>{{ user.name }}<\/h1> <\/div> 2. \u4fee\u6539 reactive \u6570\u636e \u5982\u679c\u60f3\u8981\u70b9\u51fb\u6309\u94ae\uff0c\u4fee\u6539 user.name \u7684\u503c\uff0c\u6211\u4eec\u53ef\u4ee5\u5728 setup \u4e2d\u5b9a\u4e49\u4e8b\u4ef6\u7684\u5904\u7406\u51fd\u6570\uff0c\u5e76\u6302\u8f7d\u5230 return \u7684\u5bf9\u8c61\u4e0a\uff0c\u4f9b\u6a21\u677f\u4f7f\u7528\uff1a setup() { const user = reactive({ name: 'liulongbin' }) \/\/ 1. \u5b9a\u4e49\u5904\u7406\u51fd\u6570 const changeUserName = () => { user.name = 'escook' } return { user, \/\/ 2. \u628a\u5904\u7406\u51fd\u6570\uff0c\u66b4\u9732\u7ed9\u6a21\u677f\u4f7f\u7528 changeUserName } } \u6700\u540e\uff0c\u5728\u6a21\u677f\u4e2d\uff0c\u4e3a <button> \u6309\u94ae\u7ed1\u5b9a\u70b9\u51fb\u4e8b\u4ef6\uff1a <!– \u6a21\u677f –> <div id="app"> <h1>{{ user.name }}<\/h1> <!– 3. \u7ed1\u5b9a\u4e8b\u4ef6\u5904\u7406\u5668 –> <button @click="changeUserName">\u6309\u94ae<\/button> <\/div> reactive \u51fd\u6570\u7684\u7f3a\u70b9\uff1a\u53ea\u80fd\u4e3a\u5f15\u7528\u7c7b\u578b\u7684\u6570\u636e\u521b\u5efa\u54cd\u5e94\u5f0f\u6570\u636e\u5bf9\u8c61\uff0c\u65e0\u6cd5\u5c06\u503c\u7c7b\u578b\u7684\u6570\u636e\u8f6c\u5316\u4e3a\u54cd\u5e94\u5f0f\u6570\u636e\u3002 3. ref \u51fd…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[12,14],"class_list":["post-375","post","type-post","status-publish","format-standard","hentry","category-vue","tag-vue3"],"_links":{"self":[{"href":"https:\/\/www.escook.cn\/index.php\/wp-json\/wp\/v2\/posts\/375","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.escook.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.escook.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.escook.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.escook.cn\/index.php\/wp-json\/wp\/v2\/comments?post=375"}],"version-history":[{"count":9,"href":"https:\/\/www.escook.cn\/index.php\/wp-json\/wp\/v2\/posts\/375\/revisions"}],"predecessor-version":[{"id":385,"href":"https:\/\/www.escook.cn\/index.php\/wp-json\/wp\/v2\/posts\/375\/revisions\/385"}],"wp:attachment":[{"href":"https:\/\/www.escook.cn\/index.php\/wp-json\/wp\/v2\/media?parent=375"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.escook.cn\/index.php\/wp-json\/wp\/v2\/categories?post=375"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.escook.cn\/index.php\/wp-json\/wp\/v2\/tags?post=375"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}