如何在文档中添加2张图像

Question

我尝试使用jsPDF和html2canvas连续下载2 div

我试过了1格，它工作正常，但是2格，它通过“ this”得到了错误

未处理的承诺拒绝：TypeError：undefined不是对象

download: function(index) {
      const doc = new jsPDF();
      /** WITH CSS */
      var canvasElement = document.createElement("canvas");
      html2canvas(this.$refs.DIV1, { canvas: canvasElement }).then(function(
        canvas
      ) {
        const img1 = canvas.toDataURL("image/png");
        var canvasElement = document.createElement("canvas");
        html2canvas(document.DIV2, { canvas: canvasElement }).then(function(
          canvas
        ) {
          const img2 = canvas.toDataURL("image/png");
        });

        doc.addImage(img1, "JPEG", -25, 20);
        doc.addImage(img2, "JPEG", -35, 25);
        doc.save("sample.pdf");
      });
    }