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Vue中的列表过渡

2019-07-16 21:47 1016 查看

<!DOCTYPE html>
<html>
<head>
    <title></title>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <link rel="stylesheet" type="text/css" href="./animate.css">
    <script src="./vue.js"></script>
    <!-- <script src="http://cdn.staticfile.org/vue/2.6.10/vue.common.dev.js"></script> -->
    
</head>
<body>
    <div id="root">
        //性能考虑，尽量不用index作为key值 <br>
        <div v-for="(item) of list" :key="item.id">
            {{item.title}}
        </div>
        <button @click="handBtnClick">add</button>
    </div>
    <script type="text/javascript">
        var count = 0;
        var vm = new Vue({
            el: "#root",
            data: {
                list: []
            },
            methods: {
                handBtnClick: function() {
                    this.list.push({
                        id: count++,
                        title: "hello"
                    });
                }
            }
        });
    </script>
</body>
</html>

之前是对单个或多个元素之间做切换动画效果，现在，对一个列表过渡效果，用标签<transition-group>：

<!DOCTYPE html>
<html>
<head>
    <title></title>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <link rel="stylesheet" type="text/css" href="./animate.css">
    <script src="./vue.js"></script>
    <!-- <script src="http://cdn.staticfile.org/vue/2.6.10/vue.common.dev.js"></script> -->
    <style type="text/css">
        /*因为没有给它命名，所以用默认v开头的class名*/
        .v-enter, .v-leave-to {
            opacity: 0;
        }
        .v-enter-active, .v-leave-active {
            transition: opacity 1s;
        }
    </style>
</head>
<body>
    <div id="root">
        //性能考虑，尽量不用index作为key值 <br>
        <transition-group>
            <div v-for="(item) of list" :key="item.id">
                {{item.title}}
            </div>
        </transition-group>
        <button @click="handBtnClick">add</button>
    </div>
    <script type="text/javascript">
        var count = 0;
        var vm = new Vue({
            el: "#root",
            data: {
                list: []
            },
            methods: {
                handBtnClick: function() {
                    this.list.push({
                        id: count++,
                        title: "hello"
                    });
                }
            }
        });
    </script>
</body>
</html>

为啥上面的效果是增加的都有渐显效果呢？

用一对<transition-group>标签包裹

<transition-group>
<div>hello</div>

<div>hello</div>

</transition-group>

相当于每一个都用一对<transition>标签包裹

<div>hello</div>

</transition>

<div>hello</div>

</transition>

<div>hello</div>

</transition>

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