当该页发回服务器时，服务器可以分析、验证、并将此视图状态数据应用回该页的控件树。

When the page is posted back to the server, the server can parse, validate, and apply this view state data back to the page's tree of controls.

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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。

As shown in Figure 3, Ext JS also provides tree controls, which provide users with a familiar file system-like view.

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如果元素是一个容器(例如列表或树视图)，它必须具有一个点，单击此点时将导致控件的背景获得焦点。

If the element is a container (such as list or tree view), it must have a point that when clicked will cause the background of the control to be focused.

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