This script can autoplay the course videos on tsinghua.yuketang.cn.
Install it from Greasy Fork to your browser with Tampermonkey extension.
Open one of the videos in some course. Since the numbers at the end of the URLs are increasing (though not continuous) as the course progresses, this script will automatically open the URLs with incremental numbers. The URLs that have no video on their pages will be skipped quickly.
The script is written for JavaScript programming practice only.