Vue学习笔记5.6 列表元素的过渡动画--看注释。也是不难的

古城微笑少年丶 2022-03-20 13:54 102阅读 0赞

<!DOCTYPE html>
    <html>
    
    <head>
        <meta charset="utf-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <title>Vue列表元素的过渡动画</title>
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <script src="vue.js"></script>
        <style>
            .v-enter,
            .v-leave-to {
                opacity: 0;
            }
            
            .v-enter-active,
            .v-leave-active {
                transition: opacity 2s;
            }
        </style>
    </head>
    
    <body>
        <div id="app">
    
            <transition-group>
                <div v-for="item of list" :key="item.id">
                    {
       {item.title}}
                </div>
            </transition-group>
            <button @click="handleClick">添加元素</button>
        </div>
    </body>
    <script>
    // 2. 这里要注意 count用全局变量
        var count = 0;
        var vm = new Vue({
            el: '#app',
            data: {
                list: []
            },
            methods: {
                handleClick: function() {
                    this.list.push({
                        id: count++,
                        title: 'hello world'
                    })
                }
            }
        })
    </script>
    
    </html>

列表的过渡动画，其实就是把每个列表元素拆成:

所以需要使用<transition-group>元素包裹列表