imooc website: http://www.imooc.com
$ node crawler.js
Usage: crawler.js [Options] --search Search for the specified keywords --list List the video list under the specified course ID or URL --download Download the video list under the specified course ID or URL 
Like this https://nodejs.org/en/download/package-manager/
You can download the zip or clone the git repository :
git clone https://github.com/monkeym4ster/imooc_crawler npm install