04.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>
    <script src="./lib/vue.js"></script>
</head>
<body>
    <div id="app">

        <h4>{{msg}}</h4>

        <!--v-bind只能实现数据的单项绑定-->
        <input type="text" v-bind:value="msg" style="width: 100%; ">

        <!--v-model可以实现数据的双向绑定-->
        <!--注意v-model只能运用在表单元素中-->
        <!--input(radio, text, address, email...) select checkbox textarea-->
         
        <input type="text" v-model:value='msg' style='width: 100%;'>
    </div>
    <script>
        var vm = new Vue(
            {
                el: '#app',
                data: {
                    msg: 'I am a message',
                },
            }
        )
    </script>
</body>
</html>