<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.active{
color: red;
}
</style>
</head>
<body>
<div id="app">
<ul>
<li v-for="(i,index) in books"
:class="{active: currentIndex === index}"
@click="Click(index)">
{{i}}
</li>
</ul>
</div>
<script src="js/vue.js">
</script>
<script>
const app = new Vue({
el: '#app',
data: {
books: ['af','t1','st1','op'],
currentIndex: 0
},
methods: {
Click(index){
this.currentIndex = index;
}
}
})
</script>
</body>
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