Vue中splice()方法对数组进行增删改等操作的实现

<template>
<div id="demo">
  <h2>v-for 遍历数组</h2>
  <ul>
    <li v-for="(item, index) in persons" :key="index">
	      序号：{{index}}
	      名字：{{item.name}}
	      年龄：{{item.age}}
     <button @click="del(index)">删除</button>
    </li>
  </ul>
</div>
</template>
<script>
export default {
  data(){
    return{
        persons: [
          {name: 'Tom', age:18},
          {name: 'Jack', age:17},
          {name: 'Bob', age:19},
          {name: 'Mary', age:16}
        ]
    }
  },
  methods:{
       //删除（注意：删除的方法名不能用delete，因为delete是系统关键字）
      del(index) {
        this.persons.splice(index, 1) 
      }
  }
}
</script>
<style>
</style>

<div id="demo">
  <h2>测试: v-for 遍历数组</h2>
  <ul>
    <li v-for="(item, index) in persons" :key="index">
	      序号：{{index}}
	      名字：{{item.name}}
	      年龄：{{item.age}}
     <button @click="update(index, {name:'张三', age: 16})">更新</button>
    </li>
  </ul>
</div>
<script type="text/javascript" src="../js/vue.js"></script>
<script type="text/javascript">
  new Vue({
    el: '#demo',
    data: {
      persons: [
        {name: 'Tom', age:18},
        {name: 'Jack', age:17},
        {name: 'Bob', age:19},
        {name: 'Mary', age:16}
      ]
    },
    methods: {
      //修改
      update(index, item) {
        this.persons.splice(index, 1, item)
      }
    }
  })
</script>

<div id="demo">
  <h2>测试: v-for 遍历数组</h2>
  <ul>
    <li v-for="(item, index) in persons" :key="index">
	      序号：{{index}}
	      名字：{{item.name}}
	      年龄：{{item.age}}
    </li>
  </ul>
  <button @click="add({name: '李四', age: 18})">添加</button>
</div>
<script type="text/javascript" src="../js/vue.js"></script>
<script type="text/javascript">
  new Vue({
    el: '#demo',
    data: {
      persons: [
        {name: 'Tom', age:18},
        {name: 'Jack', age:17},
        {name: 'Bob', age:19},
        {name: 'Mary', age:16}
      ]
    },
    methods: {
        //添加
        add (item) {
            this.persons.splice(0, 0, item)
        }
    }
  })
</script>