ant-design/components/alert/demo/banner.md

order	title
6	zh-CN en-US 顶部公告 Banner

zh-CN

用作顶部公告时，默认有图标，type 为 'warning'，并有特殊样式。

en-US

When Alert is used as banner, it has particular style, Icon and type(warning) are specified by default.

import { Alert } from 'antd';

ReactDOM.render(
  <div>
    <Alert message="Warning text" banner />
    <br />
    <Alert message="Very long warning text warning text text text text text text text" banner closable />
  </div>
, mountNode);