摘要： 参考博客地址：http://chengyoyo2006.blog.163.com/blog/static/8451734820087843950604/tree menu by jiarry +收起所有栏目+栏目一菜单一菜单二菜单三+栏目二菜单一菜单二菜单三+栏目三菜单一菜单二菜单三+栏目四菜单一菜单二菜单三菜单三菜单三菜单三+展开所有栏目初始化时：展开所有菜单时： 阅读全文