导出多个pdf并在页面中打开

 const pages = document.querySelectorAll('.pdf-page');
  const promises = Array.from(pages).map(page =>
    html2canvas(page, {
      scale: 2,
      useCORS: true,
      background: '#fff'
    })
  );

  Promise.all(promises).then(canvases => {
    const pdf = new jsPDF({
      orientation: 'p',
      unit: 'mm',
      format: 'a4'
    });

    canvases.forEach((canvas, index) => {
      const imgData = canvas.toDataURL('image/png');
      const imgWidth = 210; // A4 页面宽度
      const imgHeight = (canvas.height * imgWidth) / canvas.width;

      if (index > 0) {
        pdf.addPage();
      }

      pdf.addImage(imgData, 'PNG', 0, 0, imgWidth, imgHeight);
    });

    pdf.output('dataurlnewwindow'); // 在新窗口中打开 PDF
  });