https://lindell.me/JsBarcode/#
https://github.com/davidshimjs/qrcodejs

         <div id="qrcode" ref="qrcode" style="margin: 10px;"></div>  
         <svg id="barcode"></svg> 

<script src="js/qrcode.js"></script>
<script src="js/jsbarcode.js"></script>

methods： {
    qrCode (url) {
           // 二维码
            let qrcode = new QRCode('qrcode', {
                width: 180, 
                height: 180,    
                correctLevel : QRCode.CorrectLevel.H     
            })    
            qrcode.clear() //清除二维码 
            qrcode.makeCode(url) //生成另一个新的二维码
            // 条形码
            JsBarcode("#barcode", url,{ 
              height: 50,
              width: 2.2,
              fontSize: 14
            });
        }
       },
        mounted () {
          this.qrCode('123456789')
        }