Improve code style

components/table/Table.jsx

@@ -766,18 +766,13 @@ export default class Table extends React.Component {
       newColumn.key = this.getColumnKey(newColumn, i);
       return newColumn;
     });
-    let emptyText;
-    let emptyRowKey;
 
+    // Empty Data
+    let emptyRowKey;
     if (!data || data.length === 0) {
-      emptyText = (
-        <div className="ant-table-placeholder">
-          {locale.emptyText}
-        </div>
-      );
       columns.forEach((column, index) => {
-        columns[index].render = () => ({
-          children: !index ? emptyText : null,
+        column.render = () => ({
+          children: !index ? <div className="ant-table-placeholder">{locale.emptyText}</div> : null,
           props: {
             colSpan: !index ? columns.length : 0,
           },

components/table/demo/bordered.md

@@ -11,9 +11,7 @@ import { Table } from 'antd';
 const columns = [{
   title: '姓名',
   dataIndex: 'name',
-  render(text) {
-    return <a href="#">{text}</a>;
-  },
+  render: (text) => <a href="#">{text}</a>,
 }, {
   title: '资产',
   className: 'column-money',
@@ -40,13 +38,15 @@ const data = [{
   address: '西湖区湖底公园1号',
 }];
 
-ReactDOM.render(<Table
-  columns={columns}
-  dataSource={data}
-  bordered
-  title={() => '页头'}
-  footer={() => '页脚'}
-/>, mountNode);
+ReactDOM.render(
+  <Table
+    columns={columns}
+    dataSource={data}
+    bordered
+    title={() => '页头'}
+    footer={() => '页脚'}
+  />
+, mountNode);
 ````
 
 ````css