Dropdown 示例:

```js
const Dropdown = require('antd').Dropdown;
const Menu = require('antd').Menu;

const menu = (
  <Menu>
    <Menu.Item>
      <a target="_blank" rel="noopener noreferrer">
        选项1
      </a>
    </Menu.Item>
    <Menu.Item>
      <a target="_blank" rel="noopener noreferrer">
        选项2
      </a>
    </Menu.Item>
    <Menu.Item>
      <a target="_blank" rel="noopener noreferrer">
        选项3
      </a>
    </Menu.Item>
  </Menu>
);
<div>
  <Dropdown overlay={menu}>
    <a className="ant-dropdown-link" href="javascript:;">
      这是选项
    </a>
  </Dropdown>
  ;
</div>;
```