个支持多级的JS横向下拉导航菜单类，以目前的菜单数据来看，它可以完美支持四级，操作感很舒服，只需引用几个JS文件就可以实现，使用方法非常简单，黑色风格，很漂亮。-A multi-level drop-down navigation menu JS horizontal class to view the current menu of data, it can be the perfect support for 4, the operation feeling very comfortable, simply quote a few JS file can be achieved, using the method is very simple, black style, very pretty.