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

Logo
Vue

前往低代码交流专区

更多推荐

vue 表单验证

1、6位小写字母和数字必须包含两个字母rules: [{ required: true, message: "XXX不能为空", trigger: "blur" },{ max: 6, message: "最大长度为6位字符", trigger: "blur" },{pattern: /^(?=(?:[^a-z]*[a-z]){2})[a-z0-9]{6,6}$/, //不连续的两位字母// /^

avatar Vue
cover

echarts堆叠柱状图

avatar Vue

Error in v-on handler: "TypeError: Cannot read properties of undefined (reading 'current')"

这是一个 Vue.js 错误，报错信息提示在 v-on 处理程序中出现了错误：“TypeError: Cannot read properties of undefined(读取 'current')”。这意味示在您的代码中，试图读取一个未定义的变量 'current'。您需要检查您的代码，确保 'current' 已正确定义并初始化。...

avatar Vue