走进Vue的第二天

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>属性绑定和双向数据绑定、计算属性和侦听器</title>
    <script src="vue.js"></script>
</head>
<body>
    <!--
        绑定属性用  v-bind:属性名="vue实例中的data值"(这其中v-bind:可以缩写成:)
        双向绑定用到的是  v-model
        监听用到的方法是watch，可以实现页面自增
    -->
    <div id="root">
        <div :title="title">Hello Word</div>
        <input type="text" v-model="title">
        <div v-text="title"></div>
    </div>


    <div id="foo">
        姓：<input type="text" v-model="firstName">
        名：<input type="text" v-model="lastName">
        <p>您输入的是：{{fullName}}</p>
        <p>{{count}}</p>
    </div>

    <script>
        new Vue({
            el:"#root",
            data:{
                title : "可变性的title"
            }
        });

        new Vue({
            el:"#foo",
            data:{
                firstName:"",
                lastName:"",
                count:0
            },
            computed:{
                fullName:function () {
                    return this.firstName + this.lastName;
                }
            },
            watch:{
                firstName:function () {
                    this.count++;
                },
                lastName:function () {
                    this.count++;
                }
            }
        });
    </script>

</body>
</html>
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