网页上经常会用到的树状结构源代码,模拟文件夹方式,采用ajax方式动态加载数据,避免一次性加载带来的数据量过大的效率问题.-Pages are often used in the source code tree structure, simulating the way the folder, using the dynamic load data ajax way to avoid a one-time excessive load brought about by the efficien