![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/07\/20250730073706-6889cba21ede6.png\")
<\/p>\n\u5728\u8fc1\u79fb Vue2 \u9879\u76ee\u5230 Vue3 \u65f6，\u6700\u8ba9\u6211\u56f0\u60d1\u7684\u4e0d\u662f Composition API \u7684\u8bed\u6cd5\u53d8\u5316，\u800c\u662f\u54cd\u5e94\u5f0f\u7cfb\u7edf\u7684\u5e95\u5c42\u903b\u8f91\u91cd\u6784\u3002\u5f53\u53d1\u73b0ref(1)\u548creactive({count:1})\u5728\u6a21\u677f\u4e2d\u4f7f\u7528\u65f6\u7684\u5dee\u5f02，\u4ee5\u53casetup\u51fd\u6570\u4e2d\u8bbf\u95ee\u65b9\u5f0f\u7684\u4e0d\u540c\u540e，\u6211\u610f\u8bc6\u5230\u5fc5\u987b\u6df1\u5165\u7406\u89e3\u54cd\u5e94\u5f0f\u7cfb\u7edf\u7684\u5de5\u4f5c\u539f\u7406\u624d\u80fd\u7528\u597d\u8fd9\u4e24\u4e2a API\u3002\u672c\u6587\u5c06\u4ece\u6e90\u7801\u5b9e\u73b0\u3001\u7ec4\u4ef6\u5e94\u7528\u548c\u5b9e\u6218\u6280\u5de7\u4e09\u4e2a\u7ef4\u5ea6，\u7528\u7a0b\u5e8f\u5458\u7684\u89c6\u89d2\u89e3\u6790 Vue3 \u7684\u54cd\u5e94\u5f0f\u6570\u636e\u673a\u5236\u3002<\/p>\n
Vue3 \u7684\u54cd\u5e94\u5f0f\u7cfb\u7edf\u57fa\u4e8e ES6 \u7684 Proxy \u5b9e\u73b0，\u4e0e Vue2 \u7684 Object.defineProperty \u76f8\u6bd4，\u80fd\u66f4\u597d\u5730\u652f\u6301\u6570\u7ec4\u53d8\u5316\u76d1\u6d4b\u548c\u52a8\u6001\u5c5e\u6027\u6dfb\u52a0\u3002ref\u548creactive\u4f5c\u4e3a\u5bf9\u5916\u66b4\u9732\u7684 API，\u867d\u7136\u4f7f\u7528\u65b9\u5f0f\u4e0d\u540c，\u4f46\u6700\u7ec8\u90fd\u901a\u8fc7 Proxy \u5b9e\u73b0\u6570\u636e\u52ab\u6301\u3002<\/p>\n
\u5148\u770breactive\u7684\u6838\u5fc3\u5b9e\u73b0\u903b\u8f91（\u7b80\u5316\u7248\u6e90\u7801）：<\/p>\n
\/\/ reactive\u6838\u5fc3\u5b9e\u73b0<\/p>\n
function reactive(target) {<\/p>\n
\/\/ \u53ea\u5904\u7406\u5bf9\u8c61\u7c7b\u578b（\u6570\u7ec4\u4e5f\u662f\u5bf9\u8c61）<\/p>\n
if (typeof target !== 'object' || target === null) {<\/p>\n
return target<\/p>\n
}<\/p>\n
\/\/ \u521b\u5efaProxy\u4ee3\u7406<\/p>\n
return new Proxy(target, {<\/p>\n
\/\/ \u62e6\u622a\u5c5e\u6027\u8bfb\u53d6<\/p>\n
get(target, key, receiver) {<\/p>\n
\/\/ \u6536\u96c6\u4f9d\u8d56<\/p>\n
track(target, key)<\/p>\n
\/\/ \u9012\u5f52\u5904\u7406\u5d4c\u5957\u5bf9\u8c61<\/p>\n
const result = Reflect.get(target, key, receiver)<\/p>\n
if (typeof result === 'object' && result !== null) {<\/p>\n
return reactive(result)<\/p>\n
}<\/p>\n
return result<\/p>\n
},<\/p>\n
\/\/ \u62e6\u622a\u5c5e\u6027\u8bbe\u7f6e<\/p>\n
set(target, key, value, receiver) {<\/p>\n
const oldValue = Reflect.get(target, key, receiver)<\/p>\n
\/\/ \u5982\u679c\u503c\u672a\u53d8\u5316\u5219\u4e0d\u89e6\u53d1\u66f4\u65b0<\/p>\n
if (oldValue === value) return true<\/p>\n
\/\/ \u8bbe\u7f6e\u5c5e\u6027\u503c<\/p>\n
const result = Reflect.set(target, key, value, receiver)<\/p>\n
\/\/ \u89e6\u53d1\u66f4\u65b0<\/p>\n
trigger(target, key)<\/p>\n
return result<\/p>\n
},<\/p>\n
\/\/ \u62e6\u622a\u5c5e\u6027\u5220\u9664<\/p>\n
deleteProperty(target, key) {<\/p>\n
const hasKey = Reflect.has(target, key)<\/p>\n
const result = Reflect.deleteProperty(target, key)<\/p>\n
if (hasKey && result) {<\/p>\n
\/\/ \u89e6\u53d1\u66f4\u65b0<\/p>\n
trigger(target, key)<\/p>\n
}<\/p>\n
return result<\/p>\n
}<\/p>\n
})<\/p>\n
}<\/p>\n
\u8fd9\u6bb5\u4ee3\u7801\u5c55\u793a\u4e86reactive\u7684\u6838\u5fc3\u903b\u8f91：\u901a\u8fc7 Proxy \u521b\u5efa\u5bf9\u8c61\u7684\u4ee3\u7406，\u5728get\u62e6\u622a\u4e2d\u6536\u96c6\u4f9d\u8d56，\u5728set\u548cdeleteProperty\u62e6\u622a\u4e2d\u89e6\u53d1\u66f4\u65b0\u3002\u503c\u5f97\u6ce8\u610f\u7684\u662f\u5bf9\u5d4c\u5957\u5bf9\u8c61\u7684\u9012\u5f52\u5904\u7406 \u2014\u2014 \u5f53\u8bbf\u95ee\u5bf9\u8c61\u7684\u5c5e\u6027\u4ecd\u662f\u5bf9\u8c61\u65f6，\u4f1a\u81ea\u52a8\u5c06\u5176\u8f6c\u4e3a\u54cd\u5e94\u5f0f\u5bf9\u8c61，\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48reactive\u80fd\u6df1\u5ea6\u76d1\u6d4b\u5bf9\u8c61\u53d8\u5316\u3002<\/p>\n
ref\u7684\u5b9e\u73b0\u5219\u66f4\u590d\u6742\u4e00\u4e9b，\u56e0\u4e3a\u5b83\u9700\u8981\u5904\u7406\u57fa\u672c\u7c7b\u578b（string\u3001number\u3001boolean \u7b49）\u7684\u54cd\u5e94\u5f0f：<\/p>\n
\/\/ ref\u6838\u5fc3\u5b9e\u73b0<\/p>\n
function ref(value) {<\/p>\n
\/\/ \u521b\u5efaref\u5bf9\u8c61<\/p>\n
const refObject = {<\/p>\n
\/\/ \u6807\u8bb0\u4e3aref\u7c7b\u578b<\/p>\n
__v_isRef: true,<\/p>\n
\/\/ \u5b58\u50a8\u539f\u59cb\u503c<\/p>\n
_value: convert(value),<\/p>\n
\/\/ getter：\u8bbf\u95ee.value\u65f6\u89e6\u53d1<\/p>\n
get value() {<\/p>\n
\/\/ \u6536\u96c6\u4f9d\u8d56<\/p>\n
track(refObject, 'value')<\/p>\n
return refObject._value<\/p>\n
},<\/p>\n
\/\/ setter：\u8bbe\u7f6e.value\u65f6\u89e6\u53d1<\/p>\n
set value(newValue) {<\/p>\n
if (newValue === refObject._value) return<\/p>\n
refObject._value = convert(newValue)<\/p>\n
\/\/ \u89e6\u53d1\u66f4\u65b0<\/p>\n
trigger(refObject, 'value')<\/p>\n
}<\/p>\n
}<\/p>\n
return refObject<\/p>\n
}<\/p>\n
\/\/ \u8f6c\u6362\u503c：\u5982\u679c\u662f\u5bf9\u8c61\u5219\u8f6c\u4e3areactive<\/p>\n
function convert(value) {<\/p>\n
return typeof value === 'object' && value !== null ? reactive(value) : value<\/p>\n
}<\/p>\n
ref\u901a\u8fc7\u5305\u88f9\u5bf9\u8c61\u7684\u65b9\u5f0f\u5b9e\u73b0\u57fa\u672c\u7c7b\u578b\u7684\u54cd\u5e94\u5f0f \u2014\u2014 \u5c06\u503c\u5b58\u50a8\u5728_value\u5c5e\u6027\u4e2d，\u901a\u8fc7value\u7684 getter\/setter \u5b9e\u73b0\u4f9d\u8d56\u6536\u96c6\u548c\u66f4\u65b0\u89e6\u53d1\u3002\u5f53\u4f20\u5165\u7684\u662f\u5bf9\u8c61\u7c7b\u578b\u65f6，\u4f1a\u81ea\u52a8\u8c03\u7528reactive\u8fdb\u884c\u5904\u7406，\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48ref({})\u548creactive({})\u5728\u5e95\u5c42\u5b9e\u73b0\u4e0a\u662f\u76f8\u901a\u7684\u3002<\/p>\n
\u5728\u7ec4\u4ef6\u4e2d\u4f7f\u7528\u65f6，\u8fd9\u4e24\u79cd API \u7684\u4e3b\u8981\u533a\u522b\u4f53\u73b0\u5728\u8bbf\u95ee\u65b9\u5f0f\u4e0a：<\/p>\n
\/\/ ref\u4e0ereactive\u7684\u8bbf\u95ee\u5dee\u5f02<\/p>\n
const countRef = ref(0)<\/p>\n
const userReactive = reactive({ name: '\u5f20\u4e09' })<\/p>\n
console.log(countRef.value) \/\/ \u5fc5\u987b\u901a\u8fc7.value\u8bbf\u95ee<\/p>\n
console.log(userReactive.name) \/\/ \u76f4\u63a5\u8bbf\u95ee\u5c5e\u6027<\/p>\n
\/\/ \u5f53ref\u5b58\u50a8\u5bf9\u8c61\u65f6<\/p>\n
const userRef = ref({ age: 18 })<\/p>\n
console.log(userRef.value.age) \/\/ \u9700\u8981\u4e24\u5c42\u8bbf\u95ee<\/p>\n
\u8fd9\u79cd\u5dee\u5f02\u5728\u6a21\u677f\u4e2d\u4f1a\u88ab Vue \u81ea\u52a8\u5904\u7406 \u2014\u2014 \u6a21\u677f\u4e2d\u4f7f\u7528ref\u65f6\u4e0d\u9700\u8981\u624b\u52a8\u6dfb\u52a0.value，Vue \u7684\u7f16\u8bd1\u9636\u6bb5\u4f1a\u81ea\u52a8\u5c55\u5f00，\u4f46\u5728setup\u51fd\u6570\u3001computed\u6216\u65b9\u6cd5\u4e2d\u5fc5\u987b\u663e\u5f0f\u4f7f\u7528.value\u3002<\/p>\n
\u5728 Composition API \u4e2d，ref\u548creactive\u662f\u6784\u5efa\u7ec4\u4ef6\u72b6\u6001\u7684\u57fa\u7840\u3002\u6839\u636e\u6570\u636e\u7c7b\u578b\u548c\u4f7f\u7528\u573a\u666f\u9009\u62e9\u5408\u9002\u7684 API，\u80fd\u8ba9\u4ee3\u7801\u66f4\u7b80\u6d01\u3001\u6027\u80fd\u66f4\u4f18\u3002![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/07\/20250730073707-6889cba3909dc.png\")
<\/p>\n
\u5904\u7406\u57fa\u672c\u7c7b\u578b\u6570\u636e\u65f6，ref\u662f\u6700\u4f73\u9009\u62e9\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u8ba1\u6570\u5668\u7ec4\u4ef6\u7684\u5b9e\u73b0：<\/p>\n
<template><\/p>\n
<div class="counter"><\/p>\n
<p>\u5f53\u524d\u8ba1\u6570：{{ count }}<\/p><\/p>\n
<button @click="increment">+1<\/button><\/p>\n
<button @click="decrement">-1<\/button><\/p>\n
<\/div><\/p>\n
<\/template><\/p>\n
<script setup><\/p>\n
import { ref } from 'vue'<\/p>\n
\/\/ \u57fa\u672c\u7c7b\u578b\u54cd\u5e94\u5f0f\u6570\u636e<\/p>\n
const count = ref(0)<\/p>\n
\/\/ \u65b9\u6cd5\u5b9a\u4e49<\/p>\n
const increment = () => {<\/p>\n
count.value++ \/\/ \u5fc5\u987b\u4f7f\u7528.value<\/p>\n
}<\/p>\n
const decrement = () => {<\/p>\n
count.value–<\/p>\n
}<\/p>\n
<\/script><\/p>\n
\u5bf9\u4e8e\u5bf9\u8c61\u7c7b\u578b\u6570\u636e，reactive\u80fd\u63d0\u4f9b\u66f4\u81ea\u7136\u7684\u8bbf\u95ee\u65b9\u5f0f\u3002\u4ee5\u4e0b\u662f\u7528\u6237\u4fe1\u606f\u8868\u5355\u7ec4\u4ef6：<\/p>\n
<template><\/p>\n
<form class="user-form"><\/p>\n
<input <\/p>\n
type="text" <\/p>\n
v-model="user.name" <\/p>\n
placeholder="\u59d3\u540d"<\/p>\n
><\/p>\n
<input <\/p>\n
type="number" <\/p>\n
v-model="user.age" <\/p>\n
placeholder="\u5e74\u9f84"<\/p>\n
><\/p>\n
<p>\u7528\u6237\u4fe1\u606f：{{ user }}<\/p><\/p>\n
<\/form><\/p>\n
<\/template><\/p>\n
<script setup><\/p>\n
import { reactive } from 'vue'<\/p>\n
\/\/ \u5bf9\u8c61\u7c7b\u578b\u54cd\u5e94\u5f0f\u6570\u636e<\/p>\n
const user = reactive({<\/p>\n
name: '',<\/p>\n
age: 0<\/p>\n
})<\/p>\n
\/\/ \u6ce8\u610f：\u4e0d\u80fd\u76f4\u63a5\u66ff\u6362\u6574\u4e2a\u5bf9\u8c61<\/p>\n
\/\/ \u9519\u8bef\u793a\u4f8b：\u8fd9\u4f1a\u4e22\u5931\u54cd\u5e94\u6027<\/p>\n
\/\/ user = { name: '\u674e\u56db', age: 20 }<\/p>\n
\/\/ \u6b63\u786e\u505a\u6cd5：\u66f4\u65b0\u5c5e\u6027<\/p>\n
const resetUser = () => {<\/p>\n
user.name = ''<\/p>\n
user.age = 0<\/p>\n
}<\/p>\n
<\/script><\/p>\n
\u5b9e\u9645\u5f00\u53d1\u4e2d，\u7ecf\u5e38\u9700\u8981\u5c06\u54cd\u5e94\u5f0f\u5bf9\u8c61\u89e3\u6784\u4e3a\u666e\u901a\u53d8\u91cf\u4f7f\u7528，\u4f46\u76f4\u63a5\u89e3\u6784\u4f1a\u4e22\u5931\u54cd\u5e94\u6027\u3002\u8fd9\u65f6\u53ef\u4ee5\u4f7f\u7528toRefs\u5c06reactive\u5bf9\u8c61\u8f6c\u6362\u4e3aref\u5bf9\u8c61\u7684\u96c6\u5408：<\/p>\n
<script setup><\/p>\n
import { reactive, toRefs } from 'vue'<\/p>\n
const user = reactive({<\/p>\n
name: '\u5f20\u4e09',<\/p>\n
age: 18<\/p>\n
})<\/p>\n
\/\/ \u5c06reactive\u5bf9\u8c61\u8f6c\u6362\u4e3aref\u96c6\u5408<\/p>\n
const { name, age } = toRefs(user)<\/p>\n
\/\/ \u89e3\u6784\u540e\u4ecd\u4fdd\u6301\u54cd\u5e94\u6027<\/p>\n
const changeName = () => {<\/p>\n
name.value = '\u674e\u56db' \/\/ \u4ecd\u9700\u4f7f\u7528.value<\/p>\n
}<\/p>\n
<\/script><\/p>\n
toRefs\u7684\u4f5c\u7528\u662f\u4e3a\u5bf9\u8c61\u7684\u6bcf\u4e2a\u5c5e\u6027\u521b\u5efa\u5bf9\u5e94\u7684ref，\u8fd9\u6837\u89e3\u6784\u540e\u7684\u6570\u636e\u4ecd\u7136\u4fdd\u6301\u54cd\u5e94\u6027\u8fde\u63a5\u3002\u8fd9\u5728\u5c06\u7ec4\u4ef6\u72b6\u6001\u62c6\u5206\u5230\u591a\u4e2a\u7ec4\u5408\u51fd\u6570\u65f6\u7279\u522b\u6709\u7528：<\/p>\n
\/\/ \u7ec4\u5408\u51fd\u6570：\u5904\u7406\u7528\u6237\u4fe1\u606f<\/p>\n
function useUser() {<\/p>\n
const user = reactive({<\/p>\n
name: '',<\/p>\n
age: 0<\/p>\n
})<\/p>\n
\/\/ \u65b9\u6cd5<\/p>\n
const setName = (newName) => {<\/p>\n
user.name = newName<\/p>\n
}<\/p>\n
\/\/ \u8fd4\u56deref\u96c6\u5408，\u65b9\u4fbf\u7ec4\u4ef6\u89e3\u6784\u4f7f\u7528<\/p>\n
return {<\/p>\n
…toRefs(user),<\/p>\n
setName<\/p>\n
}<\/p>\n
}<\/p>\n
\/\/ \u5728\u7ec4\u4ef6\u4e2d\u4f7f\u7528<\/p>\n
<script setup><\/p>\n
import { useUser } from '.\/composables\/useUser'<\/p>\n
const { name, age, setName } = useUser()<\/p>\n
<\/script><\/p>\n
\u8fd9\u79cd\u6a21\u5f0f\u80fd\u8ba9\u7ec4\u5408\u51fd\u6570\u8fd4\u56de\u7684\u72b6\u6001\u5728\u7ec4\u4ef6\u4e2d\u88ab\u7075\u6d3b\u4f7f\u7528，\u540c\u65f6\u4fdd\u6301\u54cd\u5e94\u6027\u3002<\/p>\n
\u5728\u5b9e\u9645\u9879\u76ee\u4e2d，\u9519\u8bef\u4f7f\u7528ref\u548creactive\u53ef\u80fd\u5bfc\u81f4\u54cd\u5e94\u6027\u4e22\u5931\u6216\u6027\u80fd\u95ee\u9898\u3002\u638c\u63e1\u8fd9\u4e9b API \u7684\u8fb9\u754c\u60c5\u51b5\u548c\u4f18\u5316\u6280\u5de7，\u80fd\u8ba9\u4ee3\u7801\u66f4\u5065\u58ee\u3002<\/p>\n
\u5904\u7406\u6570\u7ec4\u65f6，reactive\u7684\u8868\u73b0\u6709\u65f6\u4f1a\u51fa\u4eba\u610f\u6599：<\/p>\n
\/\/ \u6570\u7ec4\u54cd\u5e94\u5f0f\u5904\u7406<\/p>\n
const books = reactive([<\/p>\n
{ id: 1, title: 'Vue\u5b9e\u6218' },<\/p>\n
{ id: 2, title: 'JavaScript\u9ad8\u7ea7\u7a0b\u5e8f\u8bbe\u8ba1' }<\/p>\n
])<\/p>\n
\/\/ \u6b63\u786e：\u76f4\u63a5\u4fee\u6539\u6570\u7ec4\u5143\u7d20\u5c5e\u6027<\/p>\n
books[0].title = 'Vue3\u5b9e\u6218' \/\/ \u54cd\u5e94\u5f0f\u6709\u6548<\/p>\n
\/\/ \u6b63\u786e：\u4f7f\u7528\u6570\u7ec4\u65b9\u6cd5<\/p>\n
books.push({ id: 3, title: 'React\u8bbe\u8ba1\u6a21\u5f0f' }) \/\/ \u54cd\u5e94\u5f0f\u6709\u6548<\/p>\n
\/\/ \u5371\u9669：\u76f4\u63a5\u66ff\u6362\u6570\u7ec4<\/p>\n
books = [\/* \u65b0\u6570\u7ec4 *\/] \/\/ \u54cd\u5e94\u6027\u4e22\u5931<\/p>\n
\/\/ \u6b63\u786e：\u6e05\u7a7a\u6570\u7ec4\u540e\u6dfb\u52a0\u65b0\u5143\u7d20<\/p>\n
books.length = 0<\/p>\n
newBooks.forEach(book => books.push(book))<\/p>\n
\/\/ \u6b63\u786e：\u4f7f\u7528\u7d22\u5f15\u66ff\u6362\u5143\u7d20<\/p>\n
books.splice(0, 1, { id: 1, title: 'Vue3\u5b9e\u6218' })<\/p>\n
\u5f53\u9700\u8981\u66ff\u6362\u6574\u4e2a\u6570\u7ec4\u65f6，\u66f4\u597d\u7684\u505a\u6cd5\u662f\u4f7f\u7528ref\u5305\u88f9\u6570\u7ec4：<\/p>\n
\/\/ \u66f4\u5b89\u5168\u7684\u6570\u7ec4\u5904\u7406\u65b9\u5f0f<\/p>\n
const books = ref([<\/p>\n
{ id: 1, title: 'Vue\u5b9e\u6218' }<\/p>\n
])<\/p>\n
\/\/ \u76f4\u63a5\u66ff\u6362\u6574\u4e2a\u6570\u7ec4（\u54cd\u5e94\u6027\u4fdd\u6301）<\/p>\n
books.value = [<\/p>\n
{ id: 1, title: 'Vue3\u5b9e\u6218' },<\/p>\n
{ id: 2, title: 'React\u8bbe\u8ba1\u6a21\u5f0f' }<\/p>\n
]<\/p>\n
ref\u5305\u88f9\u7684\u6570\u7ec4\u5728\u66ff\u6362\u65f6\u53ea\u9700\u66f4\u65b0.value，\u6bd4reactive\u7684\u6570\u7ec4\u5904\u7406\u66f4\u76f4\u89c2，\u8fd9\u4e5f\u662f\u6211\u5728\u9879\u76ee\u4e2d\u5904\u7406\u6570\u7ec4\u65f6\u4f18\u5148\u9009\u62e9ref\u7684\u539f\u56e0\u3002<\/p>\n
\u53e6\u4e00\u4e2a\u5bb9\u6613\u51fa\u9519\u7684\u573a\u666f\u662f\u89e3\u6784ref\u6570\u7ec4：<\/p>\n
\/\/ \u9519\u8bef\u793a\u4f8b：\u89e3\u6784\u540e\u4e22\u5931\u54cd\u5e94\u6027<\/p>\n
const bookList = ref([{ id: 1 }, { id: 2 }])<\/p>\n
const [book1, book2] = bookList.value \/\/ \u666e\u901a\u5bf9\u8c61，\u65e0\u54cd\u5e94\u6027<\/p>\n
\/\/ \u6b63\u786e\u505a\u6cd5：\u4fdd\u6301\u6570\u7ec4\u7684ref\u5f15\u7528<\/p>\n
const getBook = (index) => {<\/p>\n
return bookList.value[index] \/\/ \u4ecd\u80fd\u89e6\u53d1\u54cd\u5e94\u5f0f<\/p>\n
}<\/p>\n
\/\/ \u6216\u8005\u4f7f\u7528toRefs\u5904\u7406\u6570\u7ec4<\/p>\n
const bookRefs = toRefs(bookList.value)<\/p>\n
console.log(bookRefs[0].value.id) \/\/ \u54cd\u5e94\u5f0f\u6709\u6548<\/p>\n
\u5728\u6027\u80fd\u4f18\u5316\u65b9\u9762，\u5bf9\u4e8e\u5927\u578b\u5bf9\u8c61，\u5e94\u907f\u514d\u4f7f\u7528reactive\u8fdb\u884c\u6df1\u5c42\u54cd\u5e94\u5f0f\u8f6c\u6362\u3002\u53ef\u4ee5\u4f7f\u7528shallowRef\u6216shallowReactive\u521b\u5efa\u6d45\u5c42\u54cd\u5e94\u5f0f\u6570\u636e：<\/p>\n
\/\/ \u6d45\u5c42\u54cd\u5e94\u5f0f：\u53ea\u76d1\u6d4b\u9876\u5c42\u5c5e\u6027<\/p>\n
const shallowUser = shallowReactive({<\/p>\n
name: '\u5f20\u4e09',<\/p>\n
address: { city: '\u5317\u4eac' } \/\/ \u6df1\u5c42\u5bf9\u8c61\u65e0\u54cd\u5e94\u6027<\/p>\n
})<\/p>\n
\/\/ \u4fee\u6539\u9876\u5c42\u5c5e\u6027：\u6709\u6548<\/p>\n
shallowUser.name = '\u674e\u56db'<\/p>\n
\/\/ \u4fee\u6539\u6df1\u5c42\u5c5e\u6027：\u65e0\u54cd\u5e94\u6027<\/p>\n
shallowUser.address.city = '\u4e0a\u6d77' \/\/ \u4e0d\u4f1a\u89e6\u53d1\u66f4\u65b0<\/p>\n
\/\/ \u6b63\u786e\u505a\u6cd5：\u66ff\u6362\u6574\u4e2a\u6df1\u5c42\u5bf9\u8c61<\/p>\n
shallowUser.address = { city: '\u4e0a\u6d77' } \/\/ \u6709\u6548<\/p>\n
shallowRef\u548cshallowReactive\u9002\u7528\u4e8e\u4e0d\u9700\u8981\u6df1\u5c42\u54cd\u5e94\u5f0f\u7684\u573a\u666f，\u5982\u7b2c\u4e09\u65b9\u5e93\u5b9e\u4f8b\u3001\u5927\u578b\u6570\u636e\u96c6\u5408\u7b49，\u80fd\u663e\u8457\u63d0\u5347\u6027\u80fd\u3002<\/p>\n
\u5728\u5904\u7406 DOM \u5143\u7d20\u65f6，ref\u8fd8\u6709\u4e00\u4e2a\u7279\u6b8a\u7528\u9014 \u2014\u2014 \u83b7\u53d6\u5143\u7d20\u5f15\u7528：<\/p>\n
<template><\/p>\n
<div ref="container"><\/div><\/p>\n
<input ref="usernameInput" type="text"><\/p>\n
<\/template><\/p>\n
<script setup><\/p>\n
import { ref, onMounted } from 'vue'<\/p>\n
\/\/ \u521b\u5efaDOM\u5f15\u7528<\/p>\n
const container = ref(null)<\/p>\n
const usernameInput = ref(null)<\/p>\n
onMounted(() => {<\/p>\n
\/\/ DOM\u6302\u8f7d\u540e\u624d\u80fd\u8bbf\u95ee<\/p>\n
console.log(container.value.clientWidth) \/\/ \u5bb9\u5668\u5bbd\u5ea6<\/p>\n
usernameInput.value.focus() \/\/ \u81ea\u52a8\u805a\u7126<\/p>\n
})<\/p>\n
<\/script><\/p>\n
\u8fd9\u79cd\u7528\u6cd5\u5229\u7528\u4e86ref\u7684\u5bb9\u5668\u7279\u6027，Vue \u4f1a\u5728\u7ec4\u4ef6\u6302\u8f7d\u65f6\u81ea\u52a8\u5c06 DOM \u5143\u7d20\u8d4b\u503c\u7ed9ref\u7684.value\u5c5e\u6027\u3002<\/p>\n
\u603b\u7ed3\u4e00\u4e0bref\u548creactive\u7684\u9009\u62e9\u539f\u5219：<\/p>\n
\u7406\u89e3 Vue3 \u54cd\u5e94\u5f0f\u7cfb\u7edf\u7684\u5de5\u4f5c\u539f\u7406\u540e，\u4f1a\u53d1\u73b0ref\u548creactive\u7684\u8bbe\u8ba1\u975e\u5e38\u5408\u7406 \u2014\u2014 \u5b83\u4eec\u5206\u522b\u89e3\u51b3\u4e86\u4e0d\u540c\u6570\u636e\u7c7b\u578b\u7684\u54cd\u5e94\u6027\u95ee\u9898，\u540c\u65f6\u4fdd\u6301\u4e86 API \u7684\u7b80\u6d01\u6027\u3002\u5728\u5b9e\u9645\u9879\u76ee\u4e2d，\u6211\u901a\u5e38\u9075\u5faa "\u57fa\u672c\u7c7b\u578b\u7528 ref，\u5bf9\u8c61\u7528 reactive，\u89e3\u6784\u7528 toRefs" \u7684\u539f\u5219，\u914d\u5408\u6d45\u5c42\u54cd\u5e94\u5f0f API \u8fdb\u884c\u6027\u80fd\u4f18\u5316，\u65e2\u80fd\u4fdd\u8bc1\u54cd\u5e94\u6027\u6b63\u5e38\u5de5\u4f5c，\u53c8\u80fd\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u6027\u80fd\u5f00\u9500\u3002![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/07\/20250730073709-6889cba5a14c3.png\")
<\/p>\n
\u968f\u7740\u5bf9\u8fd9\u4e9b API \u7406\u89e3\u7684\u6df1\u5165，\u4f60\u4f1a\u53d1\u73b0 Vue3 \u7684\u54cd\u5e94\u5f0f\u7cfb\u7edf\u6bd4 Vue2 \u66f4\u52a0\u7075\u6d3b\u548c\u5f3a\u5927，\u7279\u522b\u662f\u5728\u5904\u7406\u590d\u6742\u72b6\u6001\u7ba1\u7406\u65f6，\u8fd9\u79cd\u4f18\u52bf\u4f1a\u66f4\u52a0\u660e\u663e\u3002\u4f5c\u4e3a\u5f00\u53d1\u8005，\u82b1\u65f6\u95f4\u638c\u63e1\u8fd9\u4e9b\u5e95\u5c42\u673a\u5236，\u8fdc\u6bd4\u6b7b\u8bb0 API \u7528\u6cd5\u66f4\u6709\u4ef7\u503c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb848\u6b21\uff0c\u70b9\u8d5e10\u6b21\uff0c\u6536\u85cf8\u6b21\u3002\u672c\u6587\u6df1\u5165\u89e3\u6790Vue3\u54cd\u5e94\u5f0f\u7cfb\u7edf\uff0c\u5bf9\u6bd4ref\u548creactive\u7684\u5b9e\u73b0\u539f\u7406\u4e0e\u4f7f\u7528\u573a\u666f\u3002ref\u901a\u8fc7\u5bf9\u8c61\u5305\u88f9\u5b9e\u73b0\u57fa\u672c\u7c7b\u578b\u54cd\u5e94\u5f0f\uff0creactive\u5219\u57fa\u4e8eProxy\u6df1\u5ea6\u76d1\u6d4b\u5bf9\u8c61\u53d8\u5316\u3002\u5728\u7ec4\u4ef6\u5f00\u53d1\u4e2d\uff0c\u57fa\u672c\u7c7b\u578b\u4f18\u5148\u4f7f\u7528ref\uff0c\u5bf9\u8c61\u7c7b\u578b\u9009\u62e9reactive\uff0c\u89e3\u6784\u65f6\u914d\u5408toRefs\u4fdd\u6301\u54cd\u5e94\u6027\u3002\u6587\u7ae0\u8fd8\u63d0\u4f9b\u4e86\u5904\u7406\u6570\u7ec4\u3001DOM\u5f15\u7528\u7b49\u5b9e\u6218\u6280\u5de7\uff0c\u5e76\u63a8\u8350\u4f7f\u7528\u6d45\u5c42API\u4f18\u5316\u5927\u578b\u5bf9\u8c61\u6027\u80fd\u3002\u638c\u63e1\u8fd9\u4e9b\u6838\u5fc3\u673a\u5236\uff0c\u80fd\u66f4\u7075\u6d3b\u5730\u6784\u5efaVue3\u5e94\u7528\u72b6\u6001\u7ba1\u7406\u7cfb\u7edf\u3002_vue reactive<\/p>\n","protected":false},"author":2,"featured_media":49096,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[187,625,87],"topic":[],"class_list":["post-49099","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-javascript","tag-vue-js","tag-87"],"yoast_head":"\n