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Vue 3 编程的 10 个实用技巧,提升开发效率与代码质量

  • 2026-02-05 00:42:26
Vue 3 编程的 10 个实用技巧,提升开发效率与代码质量

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一、巧用ref与reactive,精准控制响应式

Vue 3 提供了ref和reactive两种响应式方案,避免滥用能减少性能损耗。基础类型(字符串、数字等)优先用ref,通过.value访问 / 修改,配合unref简化取值(unref(val)等价于val.value ?? val);复杂对象 / 数组用reactive,无需手动解包,但注意避免直接替换整个对象(会丢失响应式),可通过Object.assign或解构更新属性。
<template>  <div>    <p>ref基础类型:{{ count }}</p>    <p>reactive复杂对象:{{ user.name }} - {{ user.age }}</p>    <button @click="updateData">更新数据</button>  </div></template><scriptsetuplang="ts">import { ref, reactive, unref } from 'vue'// 基础类型用refconst count = ref<number>(0)// 复杂对象用reactiveconst user = reactive<{ name: string; age: number; hobbies: string[] }>({  name'张三',  age20,  hobbies: ['篮球''游戏']})const updateData = () => {  // ref需.value修改,unref简化取值(count.value → unref(count))  count.value = unref(count) + 10  // reactive直接修改属性,不丢失响应式  user.age += 1  // 禁止直接替换reactive整个对象!如需更新用Object.assign  // user = { ...user }   Object.assign(user, { name'朱大明' }) }</script>

二、用toRefs保持解构响应式

解构reactive对象时,直接解构会丢失响应式,此时toRefs能派上用场。例如:
<template>  <div>    <p>姓名:{{ name }}</p>    <p>年龄:{{ age }}</p>    <button @click="updateName">修改姓名</button>  </div></template><scriptsetuplang="ts">import { reactive, toRefs, toRef } from 'vue'const user = reactive<{ name: string; age: number; gender?: string }>({  name'李四',  age25})// toRefs解构reactive,所有属性转为响应式refconst { name, age } = toRefs(user)// toRef处理可选属性(避免解构undefined)const gender = toRef(user, 'gender')const updateName = () => {  // 解构后仍需.value修改(因为是ref)  name.value = '李小四'  gender.value = '男' // 给可选属性赋值}</script>
适合在组件中拆分复杂响应式对象,让代码更清晰。

三、watch与watchEffect按需选择

  • watch:精准监听指定数据源(ref、reactive 属性或 getter 函数),支持深度监听(deep: true)和立即执行(immediate: true),适合需要明确依赖的场景。

  • watchEffect:自动追踪依赖,初始化时立即执行,无需手动指定监听目标,适合 “副作用与依赖紧密关联” 的场景(如数据变化后请求接口),代码更简洁。

<template>  <div>    <inputv-model="keyword"placeholder="输入搜索关键词" />    <p>watch监听结果:{{ watchResult }}</p>    <p>watchEffect请求状态:{{ reqStatus }}</p>  </div></template><scriptsetuplang="ts">import { ref, watch, watchEffect } from 'vue'const keyword = ref<string>('')const watchResult = ref<string>('')const reqStatus = ref<string>('未请求')// watch:精准监听,可获取新旧值,支持配置项watch(  keyword, // 监听的源(ref/reactive/getter)  (newVal, oldVal) => {    if (newVal) watchResult.value = `从${oldVal}改为${newVal}`    else watchResult.value = ''  },  { immediatefalsedeepfalse } // 立即执行/深度监听)// watchEffect:自动追踪依赖,初始化立即执行,适合接口请求等副作用const stopWatch = watchEffect(() => {  if (keyword.value) {    reqStatus.value = '请求中...'    // 模拟接口请求    setTimeout(() => {      reqStatus.value = '请求成功'    }, 500)  } else {    reqStatus.value = '未请求'  }})// 组件卸载前停止监听(可选,watchEffect会自动停止,手动停止适合特殊场景)// import { onUnmounted } from 'vue'// onUnmounted(() => stopWatch())</script>

四、setup语法糖简化代码

Vue 3.2+ 支持语法糖,无需手动导出组件、声明 props 和 emits,大幅减少模板代码:
<template>  <div>    <p>setup语法糖:{{ msg }}</p>    <button @click="sayHello">点击触发</button>  </div></template><!-- setup语法糖核心:无需配置setup函数,无需return --><scriptsetuplang="ts">// 直接定义变量,模板可直接访问const msg = ref<string>('Vue3 setup语法糖超简洁!')// 直接定义方法,模板可直接调用const sayHello = () => {  alert('setup语法糖yyds')}// 后续技巧会结合defineProps/defineEmits,此处体现核心简化点import { ref } from 'vue'</script>
配合defineProps、defineEmits等宏,开发效率翻倍。

五、组件通信首选defineProps/defineEmits

父子组件通信时,摒弃 Vue 2 的props/$emit写法,用中的defineProps声明接收参数,defineEmits声明触发事件,类型校验更清晰:
子组件 Child.vue
<template>  <divclass="child">    <p>父组件传值:{{ name }}</p>    <button @click="sendMsgToParent">向父组件传值</button>  </div></template><scriptsetuplang="ts">// 声明接收父组件的props,TS泛型做类型约束const props = defineProps<{  name: string; // 必传属性  age?: number; // 可选属性}>()// 声明可触发的事件,TS泛型约束事件参数类型const emit = defineEmits<{  (e'update:age'value: number): void// 自定义更新事件  (e'message'msg: string): void// 普通消息事件}>()// 触发事件,向父组件传值const sendMsgToParent = () => {  emit('update:age'18)  emit('message''我是子组件的消息')}</script>
父组件 Parent.vue
<template>  <divclass="parent">    <h3>父组件</h3>    <!-- 向子组件传值 + 监听子组件事件 -->    <Child      name="张三"       @update:age="handleAgeUpdate"       @message="handleMessage"    />    <p>子组件传回的年龄:{{ childAge }}</p>  </div></template><scriptsetuplang="ts">import { ref } from 'vue'import Child from './Child.vue'const childAge = ref<number>(0)// 处理子组件的年龄更新事件const handleAgeUpdate = (val: number) => {  childAge.value = val}// 处理子组件的消息事件const handleMessage = (msg: string) => {  console.log('接收子组件消息:', msg)}</script>

六、computed缓存复杂计算逻辑

对于需要重复计算的值,用computed包裹,Vue 会缓存计算结果,仅当依赖变化时重新计算,避免无效渲染:
<template>  <div>    <divv-for="item in goodsList":key="item.id">      <p>{{ item.name }}:{{ item.price }}元 × {{ item.num }}件</p>    </div>    <h3>合计:{{ totalPrice }}元</h3>    <button @click="addNum">增加第一件商品数量</button>  </div></template><scriptsetuplang="ts">import { ref, computed } from 'vue'// 模拟商品列表type Goods = { id: number; name: string; price: number; num: number }const goodsList = ref<Goods[]>([  { id1name'Vue实战'price59num1 },  { id2name'TS入门'price39num2 },  { id3name'React基础'price49num1 }])// computed缓存计算结果,仅当goodsList中price/num变化时重新计算const totalPrice = computed<number>(() => {  console.log('computed重新计算了'// 测试:仅依赖变化时打印  return goodsList.value.reduce((sum, item) => {    return sum + item.price * item.num  }, 0)})// 修改依赖,触发computed重新计算const addNum = () => {  goodsList.value[0].num++}</script>

七、onMounted等生命周期钩子按需使用

Vue 3 生命周期钩子需从vue导入,且在setup或setup>中使用,无需像 Vue 2 那样挂载到this上:
<template>  <div>    <p>定时器计数:{{ timerCount }}</p>  </div></template><scriptsetuplang="ts">import { ref, onMounted, onUnmounted, onUpdated } from 'vue'const timerCount = ref<number>(0)let timerNodeJS.Timeout | null = null// 组件挂载后执行:开启定时器(替代Vue2的mounted)onMounted(() => {  console.log('组件挂载完成')  timer = setInterval(() => {    timerCount.value++  }, 1000)})// 组件更新后执行(替代Vue2的updated)onUpdated(() => {  console.log('组件更新了:', timerCount.value)})// 组件卸载前执行:清理定时器(关键!避免内存泄漏)onUnmounted(() => {  console.log('组件即将卸载')  if (timer) clearInterval(timer)})</script>

八、v-memo优化列表渲染性能

对于长列表或复杂组件,用v-memo缓存组件渲染结果,仅当依赖数据变化时才重新渲染,减少 DOM 操作:
<template>  <div>    <!-- 长列表渲染:v-memo缓存,仅id/status变化时重新渲染 -->    <div      v-for="item in longList"       :key="item.id"      v-memo="[item.id, item.status]" <!-- 依赖数组核心优化点 -->    >      <p>编号:{{ item.id }} - 名称:{{ item.name }}</p>      <p>状态:{{ item.status === 'active' ? '已激活' : '未激活' }}</p>      <p>无关内容:{{ item.content }}</p> <!-- 此属性变化不会触发渲染 -->    </div>    <button @click="changeContent">修改无关内容(不渲染)</button>    <button @click="changeStatus">修改状态(触发渲染)</button>  </div></template><scriptsetuplang="ts">import { ref } from 'vue'// 模拟1000条长列表数据type ListItem = { id: number; name: string; status'active' | 'inactive'content: string }const longList = ref<ListItem[]>(  Array.from({ length1000 }, (_, i) => ({    id: i + 1,    name`列表项${i + 1}`,    status: i % 2 === 0 ? 'active' : 'inactive',    content`初始内容${i + 1}`  })))// 修改v-memo依赖外的属性:不会触发组件重新渲染const changeContent = () => {  longList.value.forEach(item => {    item.content = `修改后的内容${item.id}`  })}// 修改v-memo依赖内的属性:仅对应项重新渲染const changeStatus = () => {  longList.value[0].status = longList.value[0].status === 'active' ? 'inactive' : 'active'}</script>
v-memo接收数组参数,仅当数组内数据变化时,组件才会重新渲染。

九、Teleport实现组件 “跨 DOM” 渲染

需要将组件渲染到指定 DOM 节点(如,用Teleport` 包裹,无需手动操作 DOM,适配弹窗、通知等场景:
<template>  <div>    <button @click="showModal = true">打开弹窗</button>    <!-- Teleport:将内容渲染到body节点下 -->    <Teleportto="body">      <divclass="modal-mask"v-if="showModal" @click="showModal = false">        <divclass="modal-content" @click.stop>          <h3>跨DOM弹窗</h3>          <p>我被渲染到body下,脱离父组件DOM结构</p>          <button @click="showModal = false">关闭</button>        </div>      </div>    </Teleport>  </div></template><scriptsetuplang="ts">import { ref } from 'vue'const showModal = ref<boolean>(false)</script><stylescoped>/* 弹窗样式:避免父组件样式隔离影响 */.modal-mask {  position: fixed;  top0;  left0;  width100%;  height100%;  backgroundrgba(0000.5);  display: flex;  justify-content: center;  align-items: center;}.modal-content {  width400px;  padding20px;  background#fff;  border-radius8px;}</style>

十、用TypeScript增强类型校验

Vue 3 对 TypeScript 支持更完善,ts">可直接编写 TS 代码,通过泛型为ref、reactive、props等添加类型约束,提前规避类型错误:
<template>  <div>    <p>TS约束ref:{{ count }}(仅能为数字)</p>    <p>TS约束reactive:{{ user.name }} - {{ user.age }}(类型严格校验)</p>    <button @click="testType">测试类型约束</button>  </div></template><scriptsetuplang="ts">import { ref, reactive } from 'vue'// 1. ref添加TS类型约束(基础类型)const count = ref<number>(0)// 2. 接口约束复杂对象(更易复用)interface User {  name: string;  age: number;  hobbies?: string[]; // 可选数组  getInfo() => string; // 方法类型}// reactive添加TS类型约束(复杂对象)const user = reactive<User>({  name'王小明',  age22,  hobbies: ['跑步''阅读'],  getInfo() => {    return `${user.name}${user.age}岁`  }})// 3. 泛型约束联合类型const status = ref<'active' | 'inactive' | 'pending'>('active')// 4. 类型断言(确定值的类型时使用)const num = ref<number | string>(123)const numOnly = num.value as number// 测试类型约束const testType = () => {  count.value += 1  user.age += 1  console.log(user.getInfo())  status.value = 'pending'}</script>

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  1. CONNECT:[ UseTime:0.000779s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001509s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.004353s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001204s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001428s ]
  6. SELECT * FROM `set` [ RunTime:0.009842s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001630s ]
  8. SELECT * FROM `article` WHERE `id` = 472034 LIMIT 1 [ RunTime:0.062521s ]
  9. UPDATE `article` SET `lasttime` = 1770455201 WHERE `id` = 472034 [ RunTime:0.002686s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.009858s ]
  11. SELECT * FROM `article` WHERE `id` < 472034 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.014280s ]
  12. SELECT * FROM `article` WHERE `id` > 472034 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.011882s ]
  13. SELECT * FROM `article` WHERE `id` < 472034 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.389192s ]
  14. SELECT * FROM `article` WHERE `id` < 472034 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.029034s ]
  15. SELECT * FROM `article` WHERE `id` < 472034 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.056624s ]
0.674371s