react 怎么删除dom元素

import React from 'react';
class Page2 extends React.Component {
    constructor(props) {
        super(props);
        this.state={
            deled:true
        }
        this.onClick=this.onClick.bind(this)
        this.onClickS=this.onClickS.bind(this)
      }
 //恢复
    onClick(){
        this.setState({
            deled:true
        })
    }
  //删除
    onClickS(){
        this.setState({
            deled:false
        })
    }
    render() {
        const { deled} = this.state;
        var  showMap='';
        //三元表达式判断deled的值来更新showMap
        deled==true?showMap=<img src={require('../image/joinwechat/s.png')}></img>:showMap=''//这是一张二维码图
        return (
            < >
                 <button onClick={this.onClickS}>点我删除二维码</button>
                 <button onClick={this.onClick}>点我恢复二维码</button>
                    {showMap}
            </>
        )
    }
}
export default Page2;