Html 引入element UI + vue3 报错Failed to resolve component: el-button

问题：Html 引入element UI + vue3 ，el-button效果不出来

<!DOCTYPE html>
<html>
<head><meta charset="UTF-8"><!-- import Vue before Element -->
<!--  <script src="https://unpkg.com/vue@2/dist/vue.js"></script>--><script src="js/vue3.3.8/vue.global.js"></script><!-- import JavaScript --><!--  <script src="js/elementUI/index.js"></script>--><script src="https://cdn.staticfile.org/element-ui/2.15.9/index.min.js"></script><!-- import CSS --><link rel="stylesheet" href="https://cdn.staticfile.org/element-ui/2.15.9/theme-chalk/index.css"></head>
<body>
<div id="app"><!-- 双大括号语法，可以直接拿到下面data中return 里面的数据 -->{{message}}<el-button type="success">成功按钮</el-button><el-progress type="circle" :percentage="20"></el-progress>
</div>
</body><script>const { createApp, ref } = VuecreateApp({setup() {const message = ref('Hello vue!')return {message}}}).mount('#app')</script>
</html>

运行报错：

index.min.js:1 Uncaught TypeError: Cannot read properties of undefined (reading '$isServer')

[Vue warn]: Failed to resolve component: el-button
If this is a native custom element, make sure to exclude it from component resolution via compilerOptions.isCustomElement.
at <App>

问题分析：

使用vue2的话运行正常，应该是vue3与element UI不兼容。

Element UI是一款基于Vue2.x 的界面框架；Element Plus是一款基于Vue3.x 的界面框架；

解决

vue3的话，改用element Plus

源码：

注意：在挂载vue之前，要加载elementplus

app.use(ElementPlus)

<html>
<head><meta charset="UTF-8" /><meta name="viewport" content="width=device-width,initial-scale=1.0" /><script src="https://unpkg.com/vue@next"></script><!-- import CSS --><link rel="stylesheet" href="https://unpkg.com/element-plus/dist/index.css"><!-- import JavaScript --><script src="https://unpkg.com/element-plus"></script><title>Element Plus demo</title>
</head>
<body>
<div id="app"><el-button type="primary">{{ message }}</el-button><el-progress :percentage="20" type="circle"></el-progress>
</div>
<script>const {createApp, ref} = Vueconst app = createApp({setup() {const message = ref('Hello vue!')return {message}}})app.use(ElementPlus)app.mount('#app')</script>
</body>
</html>

指定特定版：

<script src=''></script>

<link rel="stylesheet" href="https://unpkg.com/browse/element-plus@2.4.2/dist/index.css">

<script src='https://unpkg.com/element-plus@2.4.2/dist/index.full.js'></script>