Ext从后台一次性加载数据，循环获取子节点数据的问题
环境 Extjs4.2
做tree一次性从后台加载数据的时候，发现返回了数据结构，包含了children子节点结合，前端还是会继续查询每个节点的子节点，最后发现是我这边TreeStore定义有问题，
这里的root写了是res。但是后台传过来的时候，子节点写的是children。
private List<MenuTree> children;
这里将后台返回数据的子节点的名字改成res。就好了。
extjs原文如下。
For the tree to read nested data, the Ext.data.reader.Reader must be configured with a root property, so the reader can find nested data for each node (if a root is not specified, it will default to ‘children’). This will tell the tree to look for any nested tree nodes by the same keyword, i.e., ‘children’. If a root is specified in the config make sure that any nested nodes with children have the same name. Note that setting defaultRootProperty accomplishes the same thing.
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