ant-design/components/menu/demo/sider.md

order	title
1	zh-CN en-US 内嵌菜单 Vertical menu with inline children

zh-CN

垂直菜单，子菜单内嵌在菜单区域。

en-US

Vertical menu with inline submenus.

import { Menu, Icon } from 'antd';
const SubMenu = Menu.SubMenu;
const MenuItemGroup = Menu.ItemGroup;

class Sider extends React.Component {
  handleClick = (e) => {
    console.log('click ', e);
  }
  render() {
    return (
      <Menu
        onClick={this.handleClick}
        style={{ width: 240 }}
        defaultSelectedKeys={['1']}
        defaultOpenKeys={['sub1']}
        mode="inline"
      >
        <SubMenu key="sub1" title={<span><Icon type="mail" /><span>Navigation One</span></span>}>
          <MenuItemGroup key="g1" title="Item 1">
            <Menu.Item key="1">Option 1</Menu.Item>
            <Menu.Item key="2">Option 2</Menu.Item>
          </MenuItemGroup>
          <MenuItemGroup key="g2" title="Item 2">
            <Menu.Item key="3">Option 3</Menu.Item>
            <Menu.Item key="4">Option 4</Menu.Item>
          </MenuItemGroup>
        </SubMenu>
        <SubMenu key="sub2" title={<span><Icon type="appstore" /><span>Navigation Two</span></span>}>
          <Menu.Item key="5">Option 5</Menu.Item>
          <Menu.Item key="6">Option 6</Menu.Item>
          <SubMenu key="sub3" title="Submenu">
            <Menu.Item key="7">Option 7</Menu.Item>
            <Menu.Item key="8">Option 8</Menu.Item>
          </SubMenu>
        </SubMenu>
        <SubMenu key="sub4" title={<span><Icon type="setting" /><span>Navigation Three</span></span>}>
          <Menu.Item key="9">Option 9</Menu.Item>
          <Menu.Item key="10">Option 10</Menu.Item>
          <Menu.Item key="11">Option 11</Menu.Item>
          <Menu.Item key="12">Option 12</Menu.Item>
        </SubMenu>
      </Menu>
    );
  }
}

ReactDOM.render(<Sider />, mountNode);