网页顶部全屏导航栏是一款基于jQuery实现的位于页面顶端的全屏导航栏菜单，鼠标滑动到栏目项显示下拉二级菜单，代码有详细中文注释，供大家参考。-Full Screen navigation bar at the top of the page is a jQuery-based realization of the page at the top of the full screen menu navigation, slide the mouse to the column drop-down