Vue实现点击li变色

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style>
.active{
color: red;
}
</style>
</head>
<body>
<ul id="change">
<li v-for="(m,index) in content" @click="doActive(index)" :class="{active:index==current}">{{m}}</li>
</ul>
<script src="../js/vue.js"></script>
<script>
let eg = new Vue({
el:"#change",
data:{
current:0,
content:['aaa','bbb','ccc','ddd','eee']
},
methods:{
doActive:function(index){
this.current = index;
}
}
})
</script>
</body>
</html>