这个需要两个 js 库支持，html2canvas 和 jspdf。
下载：
npm install html2canvas --save
npm install jspdf–save
引用：
import { jsPDF } from ‘jspdf’;
import html2canvas from ‘html2canvas’;
直接上代码：
const downloadPDF = () => {const element: any = document.querySelector('.app');// const { scrollHeight, scrollWidth, offsetHeight, height } = element;const opts = {scale: 3, // 缩放比例，提高生成图片清晰度useCORS: true, // 允许加载跨域的图片allowTaint: false, // 允许图片跨域，和 useCORS 二者不可共同使用tainttest: true, // 检测每张图片都已经加载完成logging: true, // 日志开关，发布的时候记得改成 falseheight: element.offsetHeight};html2canvas(element, opts).then((canvas) => {let contentWidth = canvas.width;let contentHeight = canvas.height;let pageHeight = contentWidth / 592.28 * 841.89 - 40;let leftHeight = contentHeight;let position = 20;let imgWidth = 570;let imgHeight = 592.28 / contentWidth * contentHeight;let pageData = canvas.toDataURL('image/jpeg', 1.0);let PDF = new jsPDF('p', 'pt', 'a4');if (leftHeight < pageHeight) {PDF.addImage(pageData, 'JPEG', 14, 20, imgWidth, imgHeight);} else {while (leftHeight > 0) {PDF.addImage(pageData, 'JPEG', 14, position, imgWidth, imgHeight);leftHeight -= pageHeight;position -= 841.89;if (leftHeight > 0) {PDF.addPage();}}}PDF.save(2222 + '.pdf');});
};
)
