页面一些树的加载库

(dhtmlxTree的demo)

http://dhtmlx.com/docs/products/dhtmlxTree/samples/

(dhtmlxTree的api)

http://docs.dhtmlx.com/doku.php?id=dhtmlxtree:api_toc_alpha

(zTree的api以及demo)

http://www.ztree.me/v3/api.php