<a href="http://www.vinylfox.com/four-tips-for-staying-on-track-with-scope-in-extjs/">Four Tips for Staying on Track With Scope in ExtJS</a>
对于ExtJS可以使用这段代码：
ExtJS自定义事件冒泡：
Ext.ux.BroadcastEvents -application level events (aka broadcasting) v0.5
<a href="http://www.extjs.com/forum/showthread.php?t=37422">http://www.extjs.com/forum/showthread.php?t=37422</a>
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