npm install html2canvas --save

import html2canvas from 'html2canvas';

dataURLToBlob(dataurl) {//ie 图片转格式
    var arr = dataurl.split(','), mime = arr[0].match(/:(.*"none";
     a.style.display = "none";
     document.body.removeChild(dom);
     let blob = this.dataURLToBlob(dom.toDataURL("image/png"));
     a.setAttribute("href", URL.createObjectURL(blob));
     a.setAttribute("download", name + ".png")
     document.body.appendChild(a);
     a.click();
     URL.revokeObjectURL(blob);
     document.body.removeChild(a);
    });
    },
   printOut(name) {
   // 个人观察只是截取可见范围以及以下的区域，所以先将滚动条置顶
    $(window).scrollTop(0); // jQuery 的方法
    document.body.scrollTop = 0; // IE的
    document.documentElement.scrollTop = 0; // 其他
    this.downloadResult(name)
  },

npm install html2canvas --save

npm install jspdf --save

import html2canvas from 'html2canvas';
import JsPDF from 'jspdf'

printOut(name) {
  let shareContent = document.body,//需要截图的包裹的（原生的）DOM 对象
   width = shareContent.clientWidth, //获取dom 宽度
   height = shareContent.clientHeight, //获取dom 高度
   canvas = document.createElement("canvas"), //创建一个canvas节点
   scale = 2; //定义任意放大倍数 支持小数
  canvas.width = width * scale; //定义canvas 宽度 * 缩放
  canvas.height = height * scale; //定义canvas高度 *缩放
  canvas.style.width = shareContent.clientWidth * scale + "px";
  canvas.style.height = shareContent.clientHeight * scale + "px";
  canvas.getContext("2d").scale(scale, scale); //获取context,设置scale
  let opts = {
   scale: scale, // 添加的scale 参数
   canvas: canvas, //自定义 canvas
   logging: false, //日志开关，便于查看html2canvas的内部执行流程
   width: width, //dom 原始宽度
   height: height,
   useCORS: true, // 【重要】开启跨域配置
  };

  html2Canvas(shareContent, opts).then(() => {
   var contentWidth = canvas.width;
   var contentHeight = canvas.height;
   //一页pdf显示html页面生成的canvas高度;
   var pageHeight = (contentWidth / 592.28) * 841.89;
   //未生成pdf的html页面高度
   var leftHeight = contentHeight;
   //页面偏移
   var 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
   var imgWidth = 595.28;
   var imgHeight = (592.28 / contentWidth) * contentHeight;
   var pageData = canvas.toDataURL("image/jpeg", 1.0);
   var 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(name + ".pdf"); // 这里是导出的文件名
  });
  },