ant-design/components/dropdown/demo/placement.md

order	title
1	zh-CN en-US 弹出位置 Placement

zh-CN

支持 6 个弹出位置。

en-US

Support 6 placements.

import { Menu, Dropdown, Button, Space } from 'antd';

const menu = (
  <Menu
    items={[
      {
        label: (
          <a target="_blank" rel="noopener noreferrer" href="https://www.antgroup.com">
            1st menu item
          </a>
        ),
      },
      {
        label: (
          <a target="_blank" rel="noopener noreferrer" href="https://www.aliyun.com">
            2nd menu item
          </a>
        ),
      },
      {
        label: (
          <a target="_blank" rel="noopener noreferrer" href="https://www.luohanacademy.com">
            3rd menu item
          </a>
        ),
      },
    ]}
  />
);

export default () => (
  <Space direction="vertical">
    <Space wrap>
      <Dropdown overlay={menu} placement="bottomLeft">
        <Button>bottomLeft</Button>
      </Dropdown>
      <Dropdown overlay={menu} placement="bottom">
        <Button>bottom</Button>
      </Dropdown>
      <Dropdown overlay={menu} placement="bottomRight">
        <Button>bottomRight</Button>
      </Dropdown>
    </Space>
    <Space wrap>
      <Dropdown overlay={menu} placement="topLeft">
        <Button>topLeft</Button>
      </Dropdown>
      <Dropdown overlay={menu} placement="top">
        <Button>top</Button>
      </Dropdown>
      <Dropdown overlay={menu} placement="topRight">
        <Button>topRight</Button>
      </Dropdown>
    </Space>
  </Space>
);