Asynchronous

http://sporto.github.io/blog/2012/12/09/callbacks-listeners-promises/

 

http://www.cnblogs.com/liuning8023/p/3220492.html

 

http://www.ruanyifeng.com/blog/2011/08/a_detailed_explanation_of_jquery_deferred_object.html

 

http://blog.allenm.me/2012/01/jquery_deferred_promise_method/

 

http://blog.csdn.net/yanyan19880509/article/details/7339900

 

http://jqueryvsmootools.com/