// 页面导出为pdf格式 import html2Canvas from 'html2canvas' import jsPDF from 'jspdf' const htmlToPdf = { getPdf(title,url) { html2Canvas(document.querySelector('#pdfDom'), { allowTaint: false, taintTest: false, logging: false, useCORS: true, dpi: window.devicePixelRatio*4, //将分辨率提高到特定的DPI 提高四倍 scale:4 //按比例增加分辨率 }).then(canvas=>{ var pdf = new jsPDF('p', 'mm', 'a4'); //A4纸,纵向 var ctx = canvas.getContext('2d'), a4w = 190, a4h = 277, //A4大小,210mm x 297mm,四边各保留10mm的边距,显示区域190x277 imgHeight = Math.floor(a4h * canvas.width / a4w), //按A4显示比例换算一页图像的像素高度 renderedHeight = 0; while(renderedHeight < canvas.height) { var page = document.createElement("canvas"); page.width = canvas.width; page.height = Math.min(imgHeight, canvas.height - renderedHeight);//可能内容不足一页 //用getImageData剪裁指定区域,并画到前面创建的canvas对象中 page.getContext('2d').putImageData(ctx.getImageData(0, renderedHeight, canvas.width, Math.min(imgHeight, canvas.height - renderedHeight)), 0, 0); pdf.addImage(page.toDataURL('image/jpeg', 1.0), 'JPEG', 10, 10, a4w, Math.min(a4h, a4w * page.height / page.width)); //添加图像到页面,保留10mm边距 renderedHeight += imgHeight; if(renderedHeight < canvas.height) { pdf.addPage();//如果后面还有内容,添加一个空页 } // delete page; } //保存文件 pdf.save(title + '.pdf') }) } }; export default htmlToPdf;