Vue将页面导出为图片或者PDF

npm install html2canvas --save

import html2canvas from 'html2canvas';

dataURLToBlob(dataurl) {//ie 图片转格式
        var arr = dataurl.split(','), mime = arr[0].match(/:(.*?);/)[1],
         bstr = atob(arr[1]), n = bstr.length, u8arr = new Uint8Array(n);
        while (n--) {
         u8arr[n] = bstr.charCodeAt(n);
        }
        return new Blob([u8arr], {type: mime})
       },
    downloadResult(name) {
        let canvasID = document.body
        let a = document.createElement('a');
        html2canvas(canvasID).then(canvas => {
         let dom = document.body.appendChild(canvas);
         dom.style.display = "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, /https://img.qb5200.com/download-x/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
    });
   },