jQuery网页左侧固定导航栏基于jquery-1.7.1.min.js制作，点击导航栏菜单滑动到对应的页面，带返回顶部按钮。-jQuery page on the left navigation bar based on fixed jquery-1.7.1.min.js production, click on the navigation menu slide to the corresponding page, with a return to the top of the button