用来下载mooc上ppt的脚本
// ==UserScript==
// @name mooc2md
// @namespace http://tampermonkey.net/
// @version 0.1
// @description 用来下载mooc上ppt的脚本
// @author Drelf2018
// @match *://mooc1.chaoxing.com/mycourse/*
// @icon https://www.google.com/s2/favicons?sz=64&domain=chaoxing.com
// @grant none
// ==/UserScript==
function download(title, content) {
// chatgpt 抄的下载代码
var blob = new Blob([content], { type: "text/plain" });
const url = URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = url;
a.download = title + ".md";
a.click();
URL.revokeObjectURL(url);
}
function fetch() {
// 获取 ppt 所在的 doc (嵌套了三个iframe
var ifr, doc = document
for (var i = 0; i < 3; i++) {
ifr = doc.getElementsByTagName("iframe")[0]
doc = ifr.contentDocument
}
// 获取当前文档名
var title = document.getElementsByClassName("posCatalog_active")[0].innerText;
title = title.replace("\n已完成", "")
var md = `# ${title}`
// 枚举图片链接
var result = doc.evaluate("/html/body/div[1]/img", doc, null, XPathResult.ANY_TYPE, null);
var nodes = result.iterateNext();
var j = 1
while(nodes) {
md += "![" + j + "](" + nodes.src + ")\n"
nodes = result.iterateNext();
j += 1
}
// 等待确认并下载
if(confirm(title + "\n总页数：" + (j - 1))) download(title, md)
}
(function () {
'use strict';
var span = document.createElement('span');
span.style.position = "fixed"
span.style.width = "50px"
span.style.height = "50px"
span.style.backgroundColor = "white"
span.style.borderRadius = "25px"
span.style.boxShadow = "0px 1px 3px grey"
span.style.top = "50px"
span.style.left = "10px"
span.innerHTML = "下载"
span.style.textAlign = "center";
span.style.lineHeight = "50px";
span.style.fontSize = "15px";
span.onclick = fetch
document.body.appendChild(span);
})();