Show Single Eng or double En+Cn subtitles when you're watching coursera, and you may modify the script manually as you like
// ==UserScript==
// @name Show Single En or double En+Cn Subtitles for Coursera
// @name:zh 于 Coursera 显示英文单字幕或中英双字幕
// @namespace http://tampermonkey.net/
// @version 0.1
// @description Show Single Eng or double En+Cn subtitles when you're watching coursera, and you may modify the script manually as you like
// @description:zh 在 Coursera 显示英文单字幕或中英双字幕，或手动更改脚本来更换其它语言
// @author Liu Daqing
// @include http://www.coursera.org/*
// @include https://www.coursera.org/*
// @grant none
// @run-at document-end
// ==/UserScript==
(function() {
'use strict';
setInterval(function(){
var video = document.getElementById("c-video_html5_api");
if(video){
var n = video.textTracks;
var bsubtitleoff = true;
for (var o = 0; o < n.length; o++) {
var i = n[o];
if (i.kind !== "subtitles") continue;
if (i.mode == "showing" && i.language == "zh-CN") bsubtitleoff = false;
}
if (!bsubtitleoff) {
for (var o = 0; o < n.length; o++) {
var i = n[o];
//console.log(i.language);
/*
you may delete the double slash above (uncomment it), click save, and refresh coursera webpage to see the language list in console(F12).
你可以删除前一句双斜杠的注释符号，保存并刷新，在控制台（console，F12）中查看有哪些语言。
你可以刪除前一句雙斜杠的注釋符號，保存並刷新，在控制臺（console，F12）中查看有哪些語言。
*/
if (i.kind !== "subtitles") continue;
if (i.language == "zh-CN" || i.language == "en-US" || i.language == "en") {
/*
if you want to change the fixed language, just modify the word in quotation mark as you like
如果你希望更换语言，可以手动修改引号中的内容
如果你希望更換語言，可以手動修改引號中的内容
*/
i.mode = "showing";
} else {
i.mode = "hidden";
}
}
} else {
//warning: you didn't allow to show any subtitles
//字幕未开启//字幕未開啓
}
}
},500);
})();