vue中appear的用法

时间：2021-03-17 09:40:57|栏目：vue|点击：次

关于appear的用法和enter的用法相似，它只是在第一次渲染的时候才会起作用。看完整的代码：

别忘了引用vue.js

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>初始渲染的过渡</title>
 <script src="vue.js"></script>
</head>
<style>
 .custom-appear-active{
  color: #2fe26d;
  background: #b6b6b6;
  transition: all 1s ease;
 }
 .custom-appear{
  font-size: 40px;
  color: #e069e2;
  background: #7798e2;
 }
 .custom-appear-to{
  color: #e29138;
  background: #1c8942;
 }
</style>
<body>
<div id="app">
 <transition
   appear
   appear-class="custom-appear"
   appear-to-class="custom-appear-to"
   appear-active-class="custom-appear-active"
 >
  <p>appear</p>
 </transition>
</div>
<script>
 new Vue({
  el: "#app"
 })
</script>
</body>
</html>

但是这里有一些问题：关于appear-class、 appear-to-class、 appear-active-class的相同属性那个起作用的问题。

四种情况：（与他们在style中的排列顺序有关系）

1、appear-class、 appear-to-class、 appear-active-class或者 appear-to-class、appear-class、 appear-active-class的排列顺序，此时只有appear-active-class的属性起作用。

2、appear-active-class、appear-class、 appear-to-class

此时appear-active-class的不起作用，由appear-class过渡到appear-to-class属性。

3、appear-class、appear-active-class、 appear-to-class

此时appear-class属性不起作用，由appear-active-class过渡到 appear-to-class属性。

4、 appear-to-class、 appear-active-class、appear-class

此时appear-to-class不起作用，由appear-class过渡到 appear-active-class属性。

enter也有相似的问题

总结

上一篇：vue组件父子间通信详解（三）