when i enter this URL : https://www.codecademy.com/learn
but the web page are blank.
A common problem
In China because of the GFW，many websites won’t work correctly. So jquery failed to react in codes below
《script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"script》 —>these codes just can’t work.
You can use “http://libs.baidu.com/jquery/1.10.2/jquery.min.js” instead or use VPN to 科学上网