Vue用pdfJs将页面导出成pdf时报错

我想要达到的结果

install(Vue, options) {
    Vue.prototype.getPdf = function(htmlTitle) {
      var title = htmlTitle;
      html2Canvas(document.querySelector('#pdfDom'), {
        allowTaint: true
      }).then(function(canvas) {
        console.log(canvas.height, 'canvas.height');
        let contentWidth = canvas.width;
        let contentHeight = canvas.height;
        let pageHeight = (contentWidth / 592.28) * 841.89;
        let leftHeight = contentHeight;
        let position = 0;
        let imgWidth = 595.28;
        let imgHeight = (592.28 / contentWidth) * contentHeight;
        let pageData = canvas.toDataURL('image/jpeg', 1.0);
        let PDF = new JsPDF('', 'pt', 'a4');
        if (leftHeight < pageHeight) {
          PDF.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight);
        } else {
          while (leftHeight > 0) {
            PDF.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight);

            leftHeight -= pageHeight;

            position -= 841.89;

            if (leftHeight > 0) {
              PDF.addPage();
            }
          }
        }
        PDF.save(title + '.pdf');
      });
    };
  }

htmltopdf里面的错。代码发出来看看