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

order	iframe	title
6	true	zh-CN en-US 顶部公告 Banner

zh-CN

页面顶部通告形式，默认有图标且type 为 'warning'。

en-US

Display Alert as a banner at top of page.

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);