不错的dynamic menu基于css+js+html -good dynamic menu based on the css js html

不限条目的三级菜单，菜单可展开合并，纯JS HTML CSS实现-Not limited to the purpose of the three level menu, can be automatically retractable, pure HTML CSS JS implementation

模拟单复选按钮选择，主要使用js html css 模拟 很实用(Analog single check button selection, the main use of JS, HTML, CSS simulation, very practical)