text: import React from 'react';
  import Menu, { Item as MenuItem, ItemGroup as MenuItemGroup } from '../src';
  import '../assets/index.less';
  
  export default () => (
    <div>
      <h2>menu item group</h2>
      <Menu style={{ margin: 20, width: 300 }}>
        <MenuItemGroup title="group 1" key="1">
          <div style={{ padding: 16 }}>hello world</div>
        </MenuItemGroup>
        <MenuItemGroup title="group 2" key="2">
          <MenuItem key="2-1">twitter</MenuItem>
          <MenuItem key="2-2">facebook</MenuItem>
        </MenuItemGroup>
      </Menu>
    </div>
  );
  