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利用v-for和v-bind实现点击li变色，由v-for遍历出内容和索引，点击li时传入index，判断遍历的index和点击的currentIndex相等时添加class属性，使其变色
<!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>
<style>
.active {
background-color: cadetblue;
}
</style>
</head>
<body>
<div id="app">
<ul>
<li v-for='(i,index) in message' @click="btnClick(index)" :class="{active:currentIndex==index}">{{index}}-{{i}}
</li>
</ul>
</div>
<script src="../js/vue.js"></script>
<script>
const app = new Vue({
el: '#app',
data: {
currentIndex: 0,
message: ['PUBG', 'LOL', 'CF']
},
methods: {
btnClick: function (index) {
this.currentIndex = index;
}
}
});
</script>
</body>
</html>
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