mvvm框架（VUE、React）中指定列表KEY的作用

直接上代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <div id="app">
        <div>
            <input type="text" v-model="uname">
            <button @click.stop.prevent="add">添加</button>
        </div>
        <ul>
            <li v-for="(item, index) in list" :key="item.id"><input type="checkbox">{{item.id}}---{{item.name}}</li>
        </ul>
    </div>
    <script src="http://ybf-shopnew.oss-cn-beijing.aliyuncs.com/web_vendor/vendor/js/vue/vue.js?v=1"></script>
    <script>
        const vm = new Vue({
            el: '#app',
            data: {
                uname: '',
                list: [
                    {id:0, name:'张三'},
                    {id:1, name:'李四'},
                    {id:2, name:'王五'}
                ]
            },
            methods: {
                add(){
                    this.list.unshift({
                        id : this.list.length,
                        name : this.uname
                    });
                }
            }
        });
    </script>
</body>
</html>

 

posted @ 2020-11-25 18:04  jiangxiaobo  阅读(130)  评论(0)  编辑  收藏  举报