In this section, you will learn how to build ext JS extensions.
在这一小节，您将学习如何构建Ext JS扩展。
You then learned how to create an ext JS extension-a browser window that subclassed the Ext.Window component.
然后您学习了如何创建一个Ext JS扩展—子类化ext. Window组件的一个浏览器窗口。
As shown in Figure 3, Ext JS also provides tree controls, which provide users with a familiar file system-like view.
如图3所示，Ext JS还提供树控件，这种控件提供用户熟悉的与文件系统相似的视图。
An extension for ext JS is a derived class or a subclass, which is designed to allow the inclusion of additional features to existing ext JS classes.
Ext JS的扩展是从类或者子类衍生出来的，为支持现有Ext JS类包含附加特性而设计的。
In this section, you will learn how to build an Ext JS plug-in.
在本小节，我们将学习如何构建一个Ext JS插件。
Build rich Internet applications with Ext js.
用Ext JS构建富因特网应用程序。
Ext JS keeps its promise with an easy-to-use development model.
Ext JS通过一个易用的开发模型实现了它的承诺。
The plug-in is very simple: It contains the basic requirements of an Ext JS plug-in.
这个插件非常简单：包含一个Ext JS插件的基本需求。
I have seen and toyed with Ext JS applications running on an iPad with limited functionality.
我已经看到并且实验了在iPad上运行有限功能的Ext JS应用。
There has never been an easy way to create custom themes in Ext JS, and this continues to be a disappointment.
在Ext JS中从来没有一个轻松的方法来创建自定义主题，现在这仍然是一个让人失望的地方。
Another big and completely new feature to Ext JS is charting.
Ext JS中另一个大的全新特性就是图表。
Using existing Ext JS plug-ins.
使用已有Ext JS插件。
Developers should appreciate the well-thought-out design and implementation of Ext JS.
开发人员应该会喜欢Ext JS经过深思熟虑的设计和实现。
Ext JS includes controls such as message boxes, combo boxes, data grids, and toolbars.
Ext JS包含消息框、组合框、数据网格和工具栏等控件。
Although this new distribution is merely an abstraction of the full Ext JS library, it does bring a new mindset to development with Ext JS.
尽管这个新的发行版仅仅是完整Ext js库的抽象，但却引入了Ext JS开发的新思维。
Ext JS provides you with a rich set of tools to create interactive forms.
Ext JS提供一组用来创建交互式表单的工具。
Ext Direct also leverages Ext JS data stores and reduces boiler plate code, particularly with creating and handling Ajax requests.
ExtDirect还利用了Ext JS数据存储，并减少了样板式代码，尤其是在创建和处理Ajax请求方面。
It's using the excellent Ext JS 2.1 framework to define the UI, which includes almost everything.
本项目使用优秀的Ext JS 2.1框架定义ui，这些UI几乎包括了一切。
This article reviews some of the more important and useful updates to the Ext JS framework.
本文将介绍Ext JS框架中相对更重要和有用的更新。
Perhaps one of the most powerful Ext JS UI elements is the grid control.
最强大的Ext JS用户界面元素可能是网格控件。
This basically means that you don't need to instantiate the object manually; Ext JS will take care of it for you.
这基本上意味着您不需要人工初始化对象；ext JS将为您处理。
You can find existing Ext JS extensions and plug-ins in a couple of ways.
找到现有Ext JS扩展和插件有很多种方法。
The first big update to Ext JS 3.0 was the introduction of a new distribution called Ext Core.
Ext JS 3.0的第一个大的更新就是引入了一个新的发行版ExtCore。
Ext JS 4.0 shares the same base code as Sencha Touch, which already has great support for these technologies.
Ext JS 4.0与Sencha Touch共用同一个代码库，而Sencha Touch已经对这些技术有大量的支持。
Ext JS provides numerous UI elements that are essential to developing rich Internet applications (RIAs).
Ext JS提供大量用户界面元素，这是开发富因特网应用程序(RIA)所必需的。
The final feature to mention in the Ext JS 3.2 release is the accessibility theme.
Ext JS 3.2版本最后一个要提的特性是可访问性主题。
Jack Slocum continues on the Ext JS blog to describe plans for the second of these exceptions, which will cover free and open source software (FLOSS) projects which employ the Ext JS API.
JackSlocum在Ext JS博客上撰文谈到了第二个例外的起草计划，该例外将覆盖使用Ext JS API的免费或开源软件(FLOSS)项目。
As shown in Figure 4, Ext JS grids can implement paging and column sorting.
如图4所示，Ext JS网格可以实现分页和列排序。
InfoQ: What is your preferred process for developing an Ext JS application?
InfoQ：对于开发Ext JS应用，你喜欢哪种过程？
Ext JS has recognized this and added a good deal of updates to its most important component.
Ext JS认识到了这点，对这个重要组件做了大量更新。
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