The source code for the tree controls shown in Figure 3 appears in Listing 4.
图3所示树控件的源代码见清单4。
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。
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。
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。
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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