今天我们要来分享一款jQuery纵向分类菜单，这款jQuery菜单是下拉菜单，鼠标滑过菜单项时即可展开相应的子菜单，并伴随很酷的淡入淡出和滑块动画效果。当鼠标滑过菜单项时，菜单项的背景颜色也会有渐变的效果。(Today we are going to share a jQuery longitudinal taxonomy menu, the jQuery menu is a drop-down menu, the mouse slids through the menu item to expand the corresponding submenu, and is accompanied by a cool fade out and slider animation effect. When the mouse slides over the menu item, the background color of menu item also has a gradual effect.)