Vue中的nextTick作用和几个简单的使用场景

// 修改数据
vm.msg = 'Hello'
// DOM 还没有更新
Vue.nextTick(function () {
 // DOM 更新了
})

// 作为一个 Promise 使用 (2.1.0 起新增，详见接下来的提示)
Vue.nextTick()
 .then(function () {
 // DOM 更新了
 })

<template>
 <div id="test">{{msg}}</div>
</template>

<script>
export default {
 name: 'app',
 data() {
 return {
  "msg": "Hello World!"
 }
 },
 method() {
 this.msg = "Hi World!";
 this.$nextTick(() => {
  console.log('DOM updated:', document.getElementById('test').innerHTML)
 });
 }
}
</script>

<template>
<script id="container" name="content" type="text/plain"> 这里写你的初始化内容 </script>
</template>
<script>
export default {
 mounted() {
  this.nextTick(() => {
   var ue = UE.getEditor('container');
  });
 }
}

<template>
<p ref="myWidth" v-if="showMe">{{ message }}</p> <button @click="getMyWidth">获取p元素宽度</button>
</template>
<script>
export default {
 data() {
 return {
  message: "Hello world!",
  showMe: false,
 },
 methods: {
  getMyWidth() {
  this.showMe = true;
  //this.message = this.refs.myWidth.offsetWidth;  //报错 TypeError: this.refs.myWidth is undefined 
  this.nextTick(()=>{
  //dom元素更新后执行，此时能拿到p元素的属性   this.message = this.refs.myWidth.offsetWidth; })
  }
 }
 }
}
</script>