Vue实现网页转PDF方法流程详解

function print(){
	window.print();
}

    print(orderNo) {
      // 当下载pdf时，若不在页面顶部会造成PDF样式不对,所以先回到页面顶部再下载
      let top = this.$refs.wrap;
      if (top != null) {
        top.scrollIntoView();
        top = null;
      }
      html2canvas(this.$refs.wrap, {
        allowTaint: true,
      }).then(function (canvas) {
        const pageData = canvas.toDataURL("image/jpeg", 1.0);
        //p表示纵向，l表示横向，px是单位 ,[宽，长]->[x,y]
        const PDF = new JsPdf("p", "px", [2550, 3100]);
        PDF.addImage(pageData, "JPEG", 0, 0, 2550, 3100);
        PDF.save(orderNo + ".pdf");
      });
    },

    print(orderNo) {
      // 当下载pdf时，若不在页面顶部会造成PDF样式不对,所以先回到页面顶部再下载
      let top = this.$refs.wrap;
      if (top != null) {
        top.scrollIntoView();
        top = null;
      }
      html2canvas(this.$refs.wrap, {
        allowTaint: true,
      }).then(function (canvas) {
        const contentWidth = canvas.width;
        const contentHeight = canvas.height;
        //一页pdf显示html页面生成的canvas高度;
        let pageHeight = (contentWidth / 592.28) * 841.89;
        //未生成pdf的html页面高度
        let leftHeight = contentHeight;
        //页面偏移
        let position = 0;
        //a4纸的尺寸[595.28,841.89]，html页面生成的canvas在pdf中图片的宽高
        let imgWidth = 595.28;
        let imgHeight = (592.28 / contentWidth) * contentHeight;
        let pageData = canvas.toDataURL("image/jpeg", 1.0);
        const PDF = new jsPDF("", "pt", "a4");
        //有两个高度需要区分，一个是html页面的实际高度，和生成pdf的页面高度(841.89)
        //当内容未超过pdf一页显示的范围，无需分页
        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;
            //避免添加空白页
            if (leftHeight > 0) {
              PDF.addPage();
            }
          }
        }
        // const pageData = canvas.toDataURL("image/jpeg", 1.0);
        // //p表示纵向，l表示横向，px是单位 ,[宽，长]->[x,y]
        // const PDF = new JsPdf("p", "px", [2550, 3100]);
        // PDF.addImage(pageData, "JPEG", 0, 0, 2550, 3100);
        PDF.save(orderNo + ".pdf");
      });
    },

.print {
  position: fixed;
  background-color: #fff;
  height: 0px;
  // width: 0px;
  overflow: hidden;
  .header {
    padding: 20px;
    text-align: right;
  }
  .wrap {
    // display: none;
    padding: 186px 107px 114px 107px;
    // overflow: scroll;
  }
  .slip {
    display: flex;
    flex-direction: column;
    padding: 81px;
    border: 2px solid #000000;
    position: relative;
    width: 2336px;
    height: 3000px;
    .title {
      display: block;
      padding: 0px 20px;
      position: absolute;
      top: -60px;
      left: 50%;
      transform: translateX(-50%);
      font-style: normal;
      font-weight: 600;
      font-size: 112px;
      line-height: 131px;
      color: #000000;
      background-color: #fff;
    }
   }
  }