jsPDF 实现 Google 云端硬盘只读 PDF 文件下载导出

/* 
	Via https://codingcat.codes/2019/01/09/download-view-protected-pdf-google-drive-js-code/
	If the images are not complete, try zooming the page to get the full image.
	1. Open Developer Tools on separate window and choose the Console tab
	2. Paste the code below (and hit enter)
*/

let jspdf = document.createElement("script");
 
jspdf.onload = function () {
 
    let pdf = new jsPDF();
    let elements = document.getElementsByTagName("img");
    for (let i in elements) {
        let img = elements[i];
        if (!/^blob:/.test(img.src)) {
            continue;
        }
        let can = document.createElement('canvas');
        let con = can.getContext('2d');
        can.width = img.width;
        can.height = img.height;
        con.drawImage(img, 0, 0);
        let imgData = can.toDataURL("image/jpeg", 1.0);
        pdf.addImage(imgData, 'JPEG', 0, 0);
        pdf.addPage();
    }

    pdf.save(document.title.split('.pdf - ')[0]+".pdf");
};
 
jspdf.src = 'https://cdn.bootcss.com/jspdf/1.5.3/jspdf.debug.js';
document.body.appendChild(jspdf);