问隐藏reactjs中的组件

EN

render() {

return (
  <div>
  <LeftMenu   />
  <RightContent albumdata = {this.state.albumdata}
                getAlbumData = {this.getAlbumData}
                albumthumbnail = {this.state.albumthumbnail}
                getAlbumThumbnail = {this.getAlbumThumbnail}
  />
  </div>
);

import React, { Component } from 'react'
import './LeftMenu.css'
import RightContent from './RightContent.js'

class LeftMenu extends Component {
    constructor(props){
        super(props);
    this.state = {
        RCVisible: true
    }
}
    render() {
        function ResetState() {
            this.setState(prevState => ({ RCVisible: !prevState.RCVisible }))
        }
        return (
            <div class="content">
                <div class="logo"></div>
            <a href="#" class="albumbutton">Albums</a>
                <div class="break"></div>
            <a href="#" class="resetbutton" onClick={ResetState}>Reset</a>

            </div>
        );
    }
}
export default LeftMenu;