Now that the tree is created, you can expand a node that fetches data for the requested node.
现在已经创建了树，您可以扩展获取被请求节点数据的节点了。
treeNodeExpand: Expand a particular node in the category tree.
treeNodeExpand：展开类别树中的特定节点。
treeNodeExpand: Expand a particular node in the category tree.
treeNodeExpand：展开类别树中的特定节点。
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