chore: fix Array(x).key() cannot works in codesandbox/codepen

Co-authored-by: Nweiwei <weiwei0814@theduapp.com>

components/tabs/demo/slide.md

@@ -40,7 +40,7 @@ class SlidingTabsDemo extends React.Component {
           <Radio.Button value="left">Vertical</Radio.Button>
         </Radio.Group>
         <Tabs defaultActiveKey="1" tabPosition={mode} style={{ height: 220 }}>
-          {[...Array(30).keys()].map(i => (
+          {[...Array.from({ length: 30 }, (v, i) => i)].map(i => (
             <TabPane tab={`Tab-${i}`} key={i} disabled={i === 28}>
               Content of tab {i}
             </TabPane>