vue使用pdf 导出当前页面，（jspdf， html2canvas ）

需要安装两个插件

npm install `html2canvas` jspdf

yarn add html2canvas jspdf

<div class="app-container" id="pdfPage">我是内容
</div><el-button size="mini" @click="onExportPdf">导出数据</el-button>

onexportPDF() {html2canvas(document.querySelector("#pdfPage"), {scale: 2, // 设置画布缩放比例allowTaint: true, // 允许加载跨域图片useCORS: true, // 使用跨域资源共享加载图片// scaleFonts: true, // 缩放字体}).then((canvas) => {var pdf = new jsPDF('p', 'mm', 'a4') // A4纸，纵向var ctx = canvas.getContext('2d')var a4w = 180;var a4h = 280 // A4大小，210mm x 297mm，四边各保留20mm的边距，显示区域170x257var imgHeight = Math.floor(a4h * canvas.width / a4w) // 按A4显示比例换算一页图像的像素高度var renderedHeight = 0while (renderedHeight < canvas.height) {var page = document.createElement('canvas')page.width = canvas.widthpage.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 += imgHeightif (renderedHeight < canvas.height) {pdf.addPage()} // 如果后面还有内容，添加一个空页}pdf.save('能力模型图' + ".pdf");}