HTML代码：

<img style="display: none" id="qrcode" data-width="100" data-height="100" data-url="https:///#/guard'+"?unique_code="+this.QueryDetail;var canvas = document.getElementById('canvas') QRCode.toCanvas(canvas, this.QueryDetail, function (error) { if (error) console.error(error) console.log('success!'); }) }