<!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>v-model的原理</title>
</head>
<body>
  <div id="app">
    <!-- v-model = v-bind + v-on -->
    <!-- 输入框内容修改，message也修改，修改message，input内容也修改，双向绑定 -->
    <!-- <input type="text" v-model="message"> -->
    <!-- 实现双向绑定 @input监听输入框事件 