fix: codepen vue version and table-header sync (#21863)

* fix: codepen vue version
* fix table-header sync

examples/docs/en-US/installation.md

@@ -25,11 +25,11 @@ We recommend our users to lock Element's version when using CDN. Please refer to
 
 ### Hello world
 
-If you are using CDN, a hello-world page is easy with Element. [Online Demo](https://codepen.io/ziyoung/pen/rRKYpd)
+If you are using CDN, a hello-world page is easy with Element. [Online Demo](https://codepen.io/bofeng/pen/poaEmJY)
 
-<iframe height="265" style="width: 100%;" scrolling="no" title="Element demo" src="//codepen.io/ziyoung/embed/rRKYpd/?height=265&theme-id=light&default-tab=html" frameborder="no" allowtransparency="true" allowfullscreen="true">
-  See the Pen <a href='https://codepen.io/ziyoung/pen/rRKYpd/'>Element demo</a> by hetech
-  (<a href='https://codepen.io/ziyoung'>@ziyoung</a>) on <a href='https://codepen.io'>CodePen</a>.
+<iframe height="265" style="width: 100%;" scrolling="no" title="Element demo" src="//codepen.io/bofeng/embed/poaEmJY/?height=265&theme-id=light&default-tab=html" frameborder="no" allowtransparency="true" allowfullscreen="true">
+  See the Pen <a href='https://codepen.io/bofeng/pen/poaEmJY/'>Element demo</a> by hetech
+  (<a href='https://codepen.io/bofeng'>@bofeng</a>) on <a href='https://codepen.io'>CodePen</a>.
 </iframe>
 
 If you are using npm and wish to apply webpack, please continue to the next page: [Quick Start](/#/en-US/component/quickstart).

examples/docs/es/installation.md

@@ -24,11 +24,11 @@ Recomendamos a nuestros usuarios congelar la versión de Element cuando usas un
 
 ### Hello world
 
-Si esta usando un CDN, una página con Hello-World es fácil con Element. [Online Demo](https://codepen.io/ziyoung/pen/rRKYpd)
+Si esta usando un CDN, una página con Hello-World es fácil con Element. [Online Demo](https://codepen.io/bofeng/pen/poaEmJY)
 
-<iframe height="265" style="width: 100%;" scrolling="no" title="Element demo" src="//codepen.io/ziyoung/embed/rRKYpd/?height=265&theme-id=light&default-tab=html,result" frameborder="no" allowtransparency="true" allowfullscreen="true">
-  See the Pen <a href='https://codepen.io/ziyoung/pen/rRKYpd/'>Element demo</a> by hetech
-  (<a href='https://codepen.io/ziyoung'>@ziyoung</a>) on <a href='https://codepen.io'>CodePen</a>.
+<iframe height="265" style="width: 100%;" scrolling="no" title="Element demo" src="//codepen.io/bofeng/embed/poaEmJY/?height=265&theme-id=light&default-tab=html,result" frameborder="no" allowtransparency="true" allowfullscreen="true">
+  See the Pen <a href='https://codepen.io/bofeng/pen/poaEmJY/'>Element demo</a> by hetech
+  (<a href='https://codepen.io/bofeng'>@bofeng</a>) on <a href='https://codepen.io'>CodePen</a>.
 </iframe>
 
 Si esta usando npm y desea combinarlo con webpack, por favor continué a la siguiente página: [Quick Start](/#/es/component/quickstart)

examples/docs/fr-FR/installation.md

@@ -25,11 +25,11 @@ Il est recommandé de fixer la version d'Element lors de l'utilisation du CDN. R
 
 ### Hello world
 
-Si vous utilisez un CDN, une page hello-world peut être obtenue facilement avec Element ([démo en ligne](https://codepen.io/ziyoung/pen/rRKYpd)).
+Si vous utilisez un CDN, une page hello-world peut être obtenue facilement avec Element ([démo en ligne](https://codepen.io/bofeng/pen/poaEmJY)).
 
-<iframe height="265" style="width: 100%;" scrolling="no" title="Element demo" src="//codepen.io/ziyoung/embed/rRKYpd/?height=265&theme-id=light&default-tab=html" frameborder="no" allowtransparency="true" allowfullscreen="true">
-  See the Pen <a href='https://codepen.io/ziyoung/pen/rRKYpd/'>Element demo</a> by hetech
-  (<a href='https://codepen.io/ziyoung'>@ziyoung</a>) on <a href='https://codepen.io'>CodePen</a>.
+<iframe height="265" style="width: 100%;" scrolling="no" title="Element demo" src="//codepen.io/bofeng/embed/poaEmJY/?height=265&theme-id=light&default-tab=html" frameborder="no" allowtransparency="true" allowfullscreen="true">
+  See the Pen <a href='https://codepen.io/bofeng/pen/poaEmJY/'>Element demo</a> by hetech
+  (<a href='https://codepen.io/bofeng'>@bofeng</a>) on <a href='https://codepen.io'>CodePen</a>.
 </iframe>
 
 Si vous utilisez npm et souhaitez ajouter webpack, continuez sur la page suivante: [Démarrer](/#/fr-FR/component/quickstart).

examples/docs/zh-CN/installation.md

@@ -25,11 +25,11 @@ npm i element-ui -S
 
 ### Hello world
 
-通过 CDN 的方式我们可以很容易地使用 Element 写出一个 Hello world 页面。[在线演示](https://codepen.io/ziyoung/pen/rRKYpd)
+通过 CDN 的方式我们可以很容易地使用 Element 写出一个 Hello world 页面。[在线演示](https://codepen.io/bofeng/pen/poaEmJY)
 
-<iframe height="265" style="width: 100%;" scrolling="no" title="Element demo" src="//codepen.io/ziyoung/embed/rRKYpd/?height=265&theme-id=light&default-tab=html" frameborder="no" allowtransparency="true" allowfullscreen="true">
-  See the Pen <a href='https://codepen.io/ziyoung/pen/rRKYpd/'>Element demo</a> by hetech
-  (<a href='https://codepen.io/ziyoung'>@ziyoung</a>) on <a href='https://codepen.io'>CodePen</a>.
+<iframe height="265" style="width: 100%;" scrolling="no" title="Element demo" src="//codepen.io/bofeng/embed/poaEmJY/?height=265&theme-id=light&default-tab=html" frameborder="no" allowtransparency="true" allowfullscreen="true">
+  See the Pen <a href='https://codepen.io/bofeng/pen/poaEmJY/'>Element demo</a> by hetech
+  (<a href='https://codepen.io/bofeng'>@bofeng</a>) on <a href='https://codepen.io'>CodePen</a>.
 </iframe>
 
 如果是通过 npm 安装，并希望配合 webpack 使用，请阅读下一节：[快速上手](/#/zh-CN/component/quickstart)。

packages/table/src/table.vue

@@ -412,7 +412,7 @@
       },
 
       // TODO 使用 CSS transform
-      syncPostion: throttle(20, function() {
+      syncPostion() {
         const { scrollLeft, scrollTop, offsetWidth, scrollWidth } = this.bodyWrapper;
         const { headerWrapper, footerWrapper, fixedBodyWrapper, rightFixedBodyWrapper } = this.$refs;
         if (headerWrapper) headerWrapper.scrollLeft = scrollLeft;
@@ -427,17 +427,30 @@
         } else {
           this.scrollPosition = 'middle';
         }
+      },
+
+      throttleSyncPostion: throttle(16, function() {
+        this.syncPostion();
       }),
 
+      onScroll(evt) {
+        let raf = window.requestAnimationFrame;
+        if (!raf) {
+          this.throttleSyncPostion();
+        } else {
+          raf(this.syncPostion);
+        }
+      },
+
       bindEvents() {
-        this.bodyWrapper.addEventListener('scroll', this.syncPostion, { passive: true });
+        this.bodyWrapper.addEventListener('scroll', this.onScroll, { passive: true });
         if (this.fit) {
           addResizeListener(this.$el, this.resizeListener);
         }
       },
 
       unbindEvents() {
-        this.bodyWrapper.removeEventListener('scroll', this.syncPostion, { passive: true });
+        this.bodyWrapper.removeEventListener('scroll', this.onScroll, { passive: true });
         if (this.fit) {
           removeResizeListener(this.$el, this.resizeListener);
         }