vue中实现循环中的值切换状态

<!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>
    <script src="./vuev2.5.21.js"></script>
    <style>
        ul{
            width: 200px;
            border: 1px solid red;
        }
        li{
            width: 100px;
            height: 30px;
            border: 1px solid black;
            margin: 20px;
        }
    </style>
</head>
<body>
    <div id="app">
        <ul v-for="(item,index) in list" :key="item.id" ref="ul" :data-index="index">
            <a href="javascript:void(0)" @click="fold(index)">切换</a>
            <li v-if="item.selected">你好 世界</li>
            <li v-else>{{item.name}}</li>
        </ul>
    </div>
    <script>
        var vm = new Vue({
            el:"#app",
            data:{
                list:[
                    {
                        id:0,
                        name:"hello world",
                        selected:true,//后台的值
                    },
                    {
                        id:1,
                        name:"hello world",
                        selected:true,//后台的值
                    },
                    {
                        id:2,
                        name:"hello world",
                        selected:true,//后台的值
                    },
                    {
                        id:3,
                        name:"hello world",
                        selected:true,//后台的值
                    }
                ]
            },
            methods:{
                fold(index){
                    for(let i = 0; i<this.list.length;i++){
                        let key = JSON.parse(this.$refs.ul[i].dataset.index);
                        if(key === index){
                            this.list[i].selected =!this.list[i].selected ;
                        }
                    }
                },
            }
        })
    </script>
</body>
</html>
vue中实现循环中的值切换状态

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