html2canvas：
https://github.com/niklasvh/html2canvas
jsPDF：
https://github.com/MrRio/jsPDF
render-html-to-pdf （html2canvas + jsPDF）
https://github.com/linwalker/render-html-to-pdf
https://mp.weixin.qq.com/s/13EF1SfGopBAeJeacLXNhA
dom-to-image.js ：
https://github.com/tsayen/dom-to-image
filesave.js jspdf.js：
https://github.com/eligrey/FileSaver.js
原文：https://www.cnblogs.com/CyLee/p/9353043.html