我正在尝试添加一个自定义的右键菜单组件到菜单项。我可以通过常量来完成，但是当我用组件来完成时，样式似乎会出错。有什么想法吗？
工作示例：https://codesandbox.io/s/m5n31opx2j
我的自定义菜单：

import React from "react";
import ReactDOM from "react-dom";
import Dropdown from "antd/lib/dropdown";
import Menu from "antd/lib/menu";
import "antd/dist/antd.css";

export default class MyMenu extends React.Component {
  render() {
    return (
      <Menu>
        <Menu.Item
          onClick={e => {
            alert("clicked");
          }}
        >
          click
        </Menu.Item>
        <Menu.Item>Like it</Menu.Item>
        <Menu.Item>Bookmark</Menu.Item>
      </Menu>
    );
  }
}

我的主要成分：

import React from "react";
import ReactDOM from "react-dom";
import Dropdown from "antd/lib/dropdown";
import Menu from "antd/lib/menu";
import "antd/dist/antd.css";
import MyMenu from "./MyMenu";

const menu = (
  <Menu>
    <Menu.Item
      onClick={e => {
        alert("clicked");
      }}
    >
      click
    </Menu.Item>
    <Menu.Item>Like it</Menu.Item>
    <Menu.Item>Bookmark</Menu.Item>
  </Menu>
);

class App extends React.Component {
  render() {
    return (
      <div>
        <Menu mode="horizontal">
          <Menu.Item
            key="1"
            onClick={() => {
              alert("parent clicked");
            }}
          >
            <Dropdown overlay={menu} trigger={[`contextMenu`]}>
              <span style={{ userSelect: "none" }}> from const </span>
            </Dropdown>
          </Menu.Item>

          <Menu.Item
            key="2"
            onClick={() => {
              alert("parent clicked");
            }}
          >
            <Dropdown overlay={<MyMenu />} trigger={[`contextMenu`]}>
              <span style={{ userSelect: "none" }}> from component </span>
            </Dropdown>
          </Menu.Item>
        </Menu>
      </div>
    );
  }
}

const APP_NODE = document.getElementById(`container`);
ReactDOM.render(<App />, APP_NODE);