fix: vue version explicitly to 2.x (#21736)

examples/components/demo-block.vue

@@ -205,7 +205,7 @@
       goCodepen() {
         // since 2.6.2 use code rather than jsfiddle https://blog.codepen.io/documentation/api/prefill/
         const { script, html, style } = this.codepen;
-        const resourcesTpl = '<scr' + 'ipt src="//unpkg.com/vue/dist/vue.js"></scr' + 'ipt>' +
+        const resourcesTpl = '<scr' + 'ipt src="//unpkg.com/vue@2/dist/vue.js"></scr' + 'ipt>' +
         '\n<scr' + `ipt src="//unpkg.com/element-ui@${ version }/lib/index.js"></scr` + 'ipt>';
         let jsTpl = (script || '').replace(/export default/, 'var Main =').trim();
         let htmlTpl = `${resourcesTpl}\n<div id="app">\n${html.trim()}\n</div>`;

examples/docs/en-US/i18n.md

@@ -144,7 +144,7 @@ ElementLocale.i18n((key, value) => i18n.t(key, value))
 ## Import via CDN
 
 ```html
-<script src="//unpkg.com/vue"></script>
+<script src="//unpkg.com/vue@2"></script>
 <script src="//unpkg.com/element-ui"></script>
 <script src="//unpkg.com/element-ui/lib/umd/locale/en.js"></script>
 
@@ -156,7 +156,7 @@ ElementLocale.i18n((key, value) => i18n.t(key, value))
 Compatible with `vue-i18n`
 
 ```html
-<script src="//unpkg.com/vue"></script>
+<script src="//unpkg.com/vue@2"></script>
 <script src="//unpkg.com/vue-i18n/dist/vue-i18n.js"></script>
 <script src="//unpkg.com/element-ui"></script>
 <script src="//unpkg.com/element-ui/lib/umd/locale/zh-CN.js"></script>

examples/docs/es/i18n.md

@@ -144,7 +144,7 @@ ElementLocale.i18n((key, value) => i18n.t(key, value))
 ## Importar via CDN
 
 ```html
-<script src="//unpkg.com/vue"></script>
+<script src="//unpkg.com/vue@2"></script>
 <script src="//unpkg.com/element-ui"></script>
 <script src="//unpkg.com/element-ui/lib/umd/locale/en.js"></script>
 
@@ -156,7 +156,7 @@ ElementLocale.i18n((key, value) => i18n.t(key, value))
 Compatible con `vue-i18n`
 
 ```html
-<script src="//unpkg.com/vue"></script>
+<script src="//unpkg.com/vue@2"></script>
 <script src="//unpkg.com/vue-i18n/dist/vue-i18n.js"></script>
 <script src="//unpkg.com/element-ui"></script>
 <script src="//unpkg.com/element-ui/lib/umd/locale/zh-CN.js"></script>

examples/docs/fr-FR/i18n.md

@@ -147,7 +147,7 @@ ElementLocale.i18n((key, value) => i18n.t(key, value))
 ## Import via un CDN
 
 ```html
-<script src="//unpkg.com/vue"></script>
+<script src="//unpkg.com/vue@2"></script>
 <script src="//unpkg.com/element-ui"></script>
 <script src="//unpkg.com/element-ui/lib/umd/locale/en.js"></script>
 
@@ -159,7 +159,7 @@ ElementLocale.i18n((key, value) => i18n.t(key, value))
 Compatible avec `vue-i18n`
 
 ```html
-<script src="//unpkg.com/vue"></script>
+<script src="//unpkg.com/vue@2"></script>
 <script src="//unpkg.com/vue-i18n/dist/vue-i18n.js"></script>
 <script src="//unpkg.com/element-ui"></script>
 <script src="//unpkg.com/element-ui/lib/umd/locale/zh-CN.js"></script>

examples/docs/zh-CN/i18n.md

@@ -146,7 +146,7 @@ ElementLocale.i18n((key, value) => i18n.t(key, value))
 ## 通过 CDN 的方式加载语言文件
 
 ```html
-<script src="//unpkg.com/vue"></script>
+<script src="//unpkg.com/vue@2"></script>
 <script src="//unpkg.com/element-ui"></script>
 <script src="//unpkg.com/element-ui/lib/umd/locale/en.js"></script>
 
@@ -158,7 +158,7 @@ ElementLocale.i18n((key, value) => i18n.t(key, value))
 搭配 `vue-i18n` 使用
 
 ```html
-<script src="//unpkg.com/vue"></script>
+<script src="//unpkg.com/vue@2"></script>
 <script src="//unpkg.com/vue-i18n/dist/vue-i18n.js"></script>
 <script src="//unpkg.com/element-ui"></script>
 <script src="//unpkg.com/element-ui/lib/umd/locale/zh-CN.js"></script>