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Vue中的列表過渡

<!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">
????????//性能考慮,盡量不用index作為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>

之前是對單個或多個元素之間做切換動畫效果,現(xiàn)在,對一個列表過渡效果,用標簽<transition-group>:

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<!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">
????????/*因為沒有給它命名,所以用默認v開頭的class名*/
????????.v-enter,?.v-leave-to?{
????????????opacity:?0;
????????}
????????.v-enter-active,?.v-leave-active?{
????????????transition:?opacity?1s;
????????}
????</style>
</head>
<body>
????<div?id="root">
????????//性能考慮,盡量不用index作為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>

為啥上面的效果是增加的都有漸顯效果呢?

用一對<transition-group>標簽包裹

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

????<div>hello</div>

????<div>hello</div>

</transition-group>

相當于每一個都用一對<transition>標簽包裹

<transition>

????<div>hello</div>

</transition>

<transition>

????<div>hello</div>

</transition>

<transition>

????<div>hello</div>

</transition>

當前標題:Vue中的列表過渡
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