Vue中利用虚拟DOM提升应用性能的方法

<template>  <div>    <button @click="toggle">Toggle</button>    <div v-if="show">This is v-if</div>    <div v-show="show">This is v-show</div>  </div></template><script>export default {  data() {    return {      show: true    };  },  methods: {    toggle() {      this.show = !this.show;    }  }};</script>

<template>  <div>    <ul>      <li v-for="item in list" :key="item.id">{{ item.name }}</li>    </ul>    <button @click="shuffle">Shuffle</button>  </div></template><script>export default {  data() {    return {      list: [        { id: 1, name: 'Apple' },        { id: 2, name: 'Banana' },        { id: 3, name: 'Orange' }      ]    };  },  methods: {    shuffle() {      this.list = this.shuffleArray(this.list);    },    shuffleArray(array) {      return array.sort(() => Math.random() - 0.5);    }  }};</script>

<template>  <div>    <p>{{ message }}</p>    <button @click="changeMessage">Change Message</button>    <button @click="addItem">Add Item</button>  </div></template><script>export default {  data() {    return {      message: 'Hello Vue',      items: []    };  },  methods: {    changeMessage() {      this.message = 'Hello World';      this.$nextTick(() => {        // DOM更新后的操作      });    },    addItem() {      this.$set(this.items, this.items.length, this.items.length + 1);    }  }};</script>