ant-design/components/button/demo/icon.md

order	title
1	图标按钮

Button 内可以嵌套图标，图标可以放在文字前、后，也可以单独存在。

import { Button } from 'antd';

ReactDOM.render(<div>
  <Button type="primary" shape="circle" icon="search" />
  <Button type="primary" icon="search">按钮</Button>
  <br />
  <Button type="ghost" shape="circle-outline" icon="search" />
  <Button type="ghost" icon="search">按钮</Button>
</div>, mountNode);