<!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>
<div>hello</div>
</transition-group>
相当于每一个都用一对<transition>标签包裹
<transition>
<div>hello</div>
</transition>
<transition>
<div>hello</div>
</transition>
<transition>
<div>hello</div>
</transition>
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