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<>前言：
<>这里分享3.0和2.0 的方法对比,
<>nextTick 是将回调推迟到下一个 DOM 更新周期之后执行。在更改了一些数据以等待 DOM 更新后立即使用它
<>vue3.0
<>1、引入
import { nextTick } from 'vue'
<>2、具体使用，配合异步
setup() { const message = ref('Hello!') const changeMessage = async newMessage
=> { message.value = newMessage await nextTick() console.log('Now DOM is
updated') } }
<>3、具体使用，普通
<>方法里：
setup () { let otherParam = reactive({ showA:false }) nextTick(()=>{
otherParam.showA = true }) return { otherParam } }
<>页面上：
<a-boo v-if="otherParam.showA"></a-boo>
<>vue2.0
this.abc = false this.$nextTick(() => { //你要执行的方法 this.abc = true })
