12.v-model.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">
        <button @click=setM>更改message</button>
        <input type="text" v-model='message' @keyup.enter=getM>
        <h2>{{message}}</h2>
    </div>
    <script src="vue.js"></script>
    <script>
        let app =new Vue({
            el:'#app',
            data:{
                message:'山东菏泽'
            },
            methods: {
                getM:function(){
                    alert(this.message)
                },
                setM:function(){
                    this.message='更改了'
                }
            },
        })
    </script>
</body>
</html>