index.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
</head>
<body>
  <div id="app">
    <div v-bind:id="id">
      {{message}}:{{name}}
    </div>
    <input type="text" v-model="name"/>
    <button v-on:click="handleClick">获取输入值</button>
  </div>
</body>
<script src="./dist/bundle.js"></script>
<script>
  var vue = new MVVM({
    el: "#app",
    data: {
      message: "测试",
      name: "百度前端",
      id: "1234"
    },
    methods: {
      handleClick: function() {
        alert(this.message + ":" + this.name + ", 点击确定会修改值");
        this.name = '修改了值为此~';
        console.log(document.getElementById(1234))
      }
    }
  })
</script>
</html>