这是一个网页上的横向滑出二级菜单，菜单是竖向排列的，但二级子菜单项是向右横向滑出的，引入了一个JS封装库文件，这个菜单兼容性方面也做的挺好，只是觉得，菜单中有些代码不便于修改，有兴趣的自己看看吧。
运行效果截图如下：
在线演示地址如下：
具体代码如下：
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