<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Key的原理</title> <script type="text/javascript" src="../vue.js"></script> </head> <body> <div id="root"> <!-- 遍历列表--> <h2>人员列表</h2> <button @click.once="addPerson">添加一个人</button> <ul> <!-- 方法一--> <!-- <li v-for="d in listData" :key="d.id">{{d.name}} - {{d.age}}</li>--> <!-- 方法二--> <li v-for="(data, index) in listData" :key="data.id"> {{data.name}} - {{data.age}} <input type="text"> </li> </ul> </div> </body> <script type="text/javascript"> Vue.config.productionTip = false const vm = new Vue({ el: "#root", data: { listData: [ {id: 1, name: '张三', age: 18}, {id: 2, name: '李四', age: 19}, {id: 3, name: '王五', age: 20} ] }, methods:{ addPerson() { const p = {id: 0, name: "赵老大", age: 80} this.listData.unshift(p) } } }) </script> </html>