vuejsBasic/20reponsiveMethods.html at master · outwittester/vuejsBasic · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport"
        content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
</head>
<div id="app">
  <ul>
    <li v-for="item in letters" :key="item.id">{{item}}</li>
  </ul>
  <button @click="btnClick"></button>
</div>
<body>
<script src="vue.js"></script>
<script>
  const app = new Vue({
    el: '#app', // 用于要挂载的元素
    data: {
      message: 'msg',
      letters: ['a', 'b', 'c', 'd', 'e']
    },
    methods:{
      btnClick(){
        this.letters.push('hello')
       // below method is not responsive
       // this.letters[0] = 'hello'
       //  Vue.set(this.letters,0,'changed')
      }
    //push pop(delete last) shift(delete first)
      //unshift(add at first) splice sort reverse
    }
  })

</script>
</body>
</html>