react 生成二维码并点击下载

const QRCode = require('qrcode.react');
export default class ProductANDClickDownload extends React.Component{
    constructor(props){
        this.state={
            Content:'https://www.baidu.com/'
        }
    }
    downloadCode=()=>{
      var Qr=document.getElementById('qrid');  
      let image = new Image();
      image.src = Qr.toDataURL("image/png");
      var a_link=document.getElementById('aId');
      a_link.href=image.src;
    }
    render(){
         
              
         
    }
}
插件文档  https://www.npmjs.com/package/qrcode.react