ant-design/components/select/demo/optgroup.md

order	title
5	分组

用 OptGroup 进行选项分组。

import { Select } from 'antd';
const Option = Select.Option;
const OptGroup = Select.OptGroup;

function handleChange(value) {
  console.log(`selected ${value}`);
}

ReactDOM.render(
  <Select defaultValue="lucy"
    style={{ width: 200 }}
    showSearch={false}
    onChange={handleChange}>
    <OptGroup label="Manager">
      <Option value="jack">jack</Option>
      <Option value="lucy">lucy</Option>
    </OptGroup>
    <OptGroup label="Engineer">
      <Option value="yiminghe">yiminghe</Option>
    </OptGroup>
  </Select>
, mountNode);