vue小练习之随机生成数字并删除

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
      <ul v-for="(item,index) in arr" :key="item.id">
        <li>{{item.id}}  <button @click="del(item.id)">{{item.content}}</button></li>
      </ul>
      <button @click="addRandom">生成</button>

    </div>
    <script src="../../vue.js"></script>
    <script>
        const app=new Vue({
            el:'#app',
            data:{
                // arr:[1,5,3],
                arr:[
                    {id:1,content:'删除'},
                    {id:3,content:'删除'},
                    {id:5,content:'删除'},
                ]


            },
            methods:{
                del(id){
                    this.arr=this.arr.filter(item=>item.id!==id)

                },
                addRandom(){
                    this.arr.push({id:Math.floor(Math.random()*20),content:'删除'})
                }
            }
        })
    </script>
</body>
</html>