spark中用皮肤写的tree，很简单的实现-written by using the skin spark tree, a very simple implementation

带复选框的属性导航栏，简单实用，代码齐全，还有运行效果图-Check the properties of the navigation bar with simple, practical, code complete, there are plans to run effects

Flex实现树，将树的数据结构进行了包装，在前台只需要简单的配置就可以实现一个Flex树的功能-Flex implementations of the tree, the tree data structure packing, only requires a simple configuration at the front desk can implement a Flex tree functions