TopMenu.md

import React, { Component, Fragment } from 'react'
import { Menu, Icon } from 'antd'

const SubMenu = Menu.SubMenu
const MenuItemGroup = Menu.ItemGroup

export default class TopMenu extends Component {
  state = {
    current: 'mail'
  }

  handleClick = e => {
    console.log('click ', e)
    this.setState({
      current: e.key
    })
  }

  render() {
    return (
      <Menu
        onClick={this.handleClick}
        selectedKeys={[this.state.current]}
        mode="horizontal"
      >
        <Menu.Item key="mail">
          <Icon type="mail" />
          Navigation One
        </Menu.Item>
        <Menu.Item key="app" disabled>
          <Icon type="appstore" />
          Navigation Two
        </Menu.Item>
        <SubMenu
          title={
            <span className="submenu-title-wrapper">
              <Icon type="setting" />
              Navigation Three - Submenu
            </span>
          }
        >
          <MenuItemGroup title="Item 1">
            <Menu.Item key="setting:1">Option 1</Menu.Item>
            <Menu.Item key="setting:2">Option 2</Menu.Item>
          </MenuItemGroup>
          <MenuItemGroup title="Item 2">
            <Menu.Item key="setting:3">Option 3</Menu.Item>
            <Menu.Item key="setting:4">Option 4</Menu.Item>
          </MenuItemGroup>
        </SubMenu>
        <Menu.Item key="alipay">
          <a
            href="https://ant.design"
            target="_blank"
            rel="noopener noreferrer"
          >
            Navigation Four - Link
          </a>
        </Menu.Item>
      </Menu>
    )
  }
}