如何用JSP+JS实现动态树！

各位大虾帮帮忙。如何实现下面的树啊。有例子发我一份。
 -变动费
     -变动成本                                                 新增
             +外包开发                                 新增|编辑|删除
             -采购成本                                 新增|编辑|删除
                   内部采购                            新增|编辑|删除
                   外部采购                            新增|编辑|删除
     +其它变动成本                                             新增
     -业务资金利息
              应收款资金利息                                     
              应付款资金利息                                     
              库存资金利息                                     
              毛利调整