vue动画-transition-group注意点

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>36-Vue-过渡动画</title>
    <script src="js/vue.js"></script>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        .v-enter{
            opacity: 0;
        }
        .v-enter-to{
            opacity: 1;
        }
        .v-enter-active{
            transition: all 3s;
        }
        .v-leave{
            opacity: 1;
        }
        .v-leave-to{
            opacity: 0;
        }
        .v-leave-active{
            transition: all 3s;
        }
    </style>
</head>
<body>
<!--
1.transition-group注意点:
默认情况下transition-group会将动画的元素放到span标签中
我们可以通过tag属性来指定将动画元素放到什么标签中

2.transition-group动画混乱问题
一般情况下组动画出现动画混乱都是因为v-for就地复用导致的
我们只需要保证所有数据key永远是唯一的即可
-->
<!--这里就是MVVM中的View-->
<div id="app">
    <form>
        <input type="text" v-model="name">
        <input type="submit" value="添加" @click.prevent="add">
    </form>
<!--    <ul>-->
        <transition-group appear tag="ul">
        <li v-for="(person,index) in persons" :key="person.id" @click="del(index)">
            <input type="checkbox">
            <span>{{index}} --- {{person.name}}</span>
        </li>
        </transition-group>
<!--    </ul>-->
</div>
<script>
    // 这里就是MVVM中的View Model
    let vue = new Vue({
        el: '#app',
        // 这里就是MVVM中的Model
        data: {
            persons: [
                {name: "zs", id: 1},
                {name: "ls", id: 2},
                {name: "ww", id: 3}
                ],
            name: "",
            id: 3
        },
        // 专门用于存储监听事件回调函数
        methods: {
            add(){
                this.id++;
                // let lastPerson = this.persons[this.persons.length - 1];
                let newPerson = {name: this.name, id: this.id};
                // this.persons.push(newPerson);
                this.persons.unshift(newPerson);
                this.name = "";
            },
            del(index){
                this.persons.splice(index, 1);
            }
        },
        // 专门用于定义计算属性的
        computed: {
        }
    });
</script>
</body>
</html>