Ext JS began as a project to extend the functionality that the YUI Library offered.
ExtJS项目最初的目的是扩展yuiLibrary提供的功能。
It also examines the proper ways to customize or extend ext widgets.
它还探讨了定制或者扩展ExtJS组件的可行办法。
Thankfully, ext JS includes a powerful class and component ecosystem that makes it easy to extend existing features or build new components entirely.
谢天谢地，ExtJS包含一个功能强大的类和组件生态系统，可以轻松地扩展现有特性或者完全构建新组件。
InfoQ: in your book you describe several components that you get out of the box, when using ext JS. Is it easy to extend those?
InfoQ：在书中，你描述了使用ExtJS时框架之外的若干组件，易于扩展吗？
Extend existing Ext Component classes in order to take advantage of managed lifecycle.
扩展现有的Ext组件类以便发挥可控生存周期的能力。
Extend existing Ext Component classes in order to take advantage of managed lifecycle.
扩展现有的Ext组件类以便发挥可控生存周期的能力。
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