将vue页面导出为图片或者PDF文件

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导出为图片 1.将页面html转换成图片   npm install html2canvas --save 2.在需要导出的页面引入  import html2canvas from 'html2canvas'; 3.在 methods 中添加方法  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) },        导出为PDF 1.将页面html转换成图片  npm install html2canvas --save 2.将图片生成pdf  npm install jspdf --save 3.在需要导出的页面引入  import html2canvas from 'html2canvas';   import JsPDF from 'jspdf' 4.在 methods 中添加方法 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     }); },