11.vue之v-bind

代码：v-bind:xxx 可以省略为 :xxx

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<!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-bind指令</title>
    <style>
        .active{
            border: 1px solid red;
        }
    </style>
</head>

<body>
    <div id="app">
        <img v-bind:src="imgSrc" alt="">
        <br>
        <img :src="imgSrc" alt="" :title="imgTitle+'!!!'" :class="isActive?'active':''" @click="toggleActive">
        <br>
        <img :src="imgSrc" alt="" :title="imgTitle+'!!!'" :class="{active:isActive}" @click="toggleActive">
　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　//对象的方式，左边是类名，右边是判断是否显示，和上面的三元表达式的效果一样
    </div>
    <!-- 开发环境版本，包含了有帮助的命令行警告 -->
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <script>
        var app = new Vue({
            el:"#app",
            data:{
                imgSrc:"http://www.itheima.com/images/logo.png",
                imgTitle:"黑马程序员",
                isActive:false
            },
            methods: {
                toggleActive:function(){
                    this.isActive = !this.isActive;
                }
            },
        })
    </script>
</body>

</html>

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