<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<style>
.red {
color: red;
}
</style>
</head>
<body>
<script src="js/vue.js"></script>
<div id="app">
<h2>请选择你的爱好：</h2>
<ul style="list-style: none; ">
<li @click="red(i)" :class="{red:(index == i)}" v-for="(item,i) in array">{{item}}</li>
</ul>
</div>
<script>
const app = new Vue({
el:"#app",
data:{
array:["唱歌","睡觉","跆拳道","跑步","羽毛球","滑雪","下棋","游泳"],
index:0
},
methods:{
red:function (i){
this.index = i;
console.log(this.index +" --- " + i);
}
}
})
</script>
</body>
</html>
emmmmmm 其实用到了一个 判断的思维吧.