官方教程

w3school

http://www.w3school.com.cn/js/js_library_jquery.asp

codecademy

http://www.codecademy.com/tracks/javascript

js异步实现

http://www.cnblogs.com/sprying/archive/2013/05/26/3100639.html

js闭包

http://www.ruanyifeng.com/blog/2009/08/learning_javascript_closures.html

理解Javascript的闭包