<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>vue2的数据双向绑定实现原理</title>
</head>
<body>
<div><input id="ipt" type="text" value="" oninput="changeVal(this)" /></div>
<div id="cnt"></div>
<script>
// 定义初始的数据