antd select下拉添加全选的按钮

实现图

代码实现:添加

onMouseDown={e=> e.preventDefault();} 阻止事件冒泡，解决选择一次下拉就收回下拉列表的问题

import React from 'react';
import ReactDOM from 'react-dom';
import {Input,DatePicker,Select,Divider,Checkbox} from 'antd';
import 'antd/dist/antd.css';
import locale from 'antd/lib/date-picker/locale/zh_CN';
import 'moment/locale/zh-cn';
import moment from 'moment';
moment.locale('zh-cn');
const { RangePicker } = DatePicker;

class InputCom extends React.Component{
	constructor(props) {
	    super(props);
	}
	render(){
		return(
			<div onMouseDown={e=> e.preventDefault();}>
				<Select mode="multiple"
					labelInvalue
					style={{300}}
					placeholder='请选择'
					dropdownRender={menu=>(
						<div>
							{menu}
							<Divider style={{margin:'2px 0'}}/>,
							<div style={{padding:'4px 8px 8px 8px',cursor:'pointer'}}>,
								<Checkbox>全选</Checkbox>
								<button className="expandBtn" style={{marginLeft:"37%",marginRight:10}}>确定</button>
								<button className="expandBtn" style={{marginLeft:10}}>取消</button>
							</div>
						</div>
					)}
				>
					<option value="1">1</option>
					<option value="2">2</option>
					<option value="3">3</option>
					<option value="4">4</option>
				</Select>
				
				
			</div>
		)
	}
}



export default InputCom;