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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