异步调用代码嵌套问题

Javascript异步编程的4种方法

http://www.ruanyifeng.com/blog/2012/12/asynchronous%EF%BC%BFjavascript.html

jQuery的deferred对象详解

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

• http://howtonode.org/control-flow
• http://bjouhier.wordpress.com/2011/04/04/currying-the-callback-or-the-essence-of-futures/
• http://howtonode.org/step-of-conductor

老赵的Jscex https://github.com/JeffreyZhao/jscex

朴灵的EventProxy https://github.com/JacksonTian/eventproxy 是两种完全不同的解决方案。