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