jquery实现多级树形分类可折叠菜单特效代码

Parent Goes somewhere
- Child Goes somewhere
  - Grand Child Goes somewhere
- Child Goes somewhere
  - Grand Child Goes somewhere
  - Grand Child Goes somewhere
    - Great Grand Child Goes somewhere
      - Great great Grand Child Goes somewhere
      - Great great Grand Child Goes somewhere
    - Great Grand Child Goes somewhere
    - Great Grand Child Goes somewhere
  - Grand Child Goes somewhere
Parent2 Goes somewhere
- Child Goes somewhere