The check box before each node in the tree controls the enabling state of the element.

树中每个节点前的复选框控制元素的启用状态。

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Previously, tree controls were created out of lists and links so the user had to TAB to each tree item.

以前树形控件是通过清单和链接创建的，因此用户必须使用制表键跳到每个树项目。

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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，ExtJS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。

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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，ExtJS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。

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