导航随着页面移动而移动是如何做的
导航随着页面移动而移动是怎么做的?
类似于淘宝的那个样子，当你下拉页面的时候，那个导航条会一直保持在顶部。
------解决方案--------------------
监视body的scrollTop,然后控制导航栏的position
------解决方案--------------------
http://www.helloweba.com/view-blog-85.html
去谷歌搜关键字 “js浮动层定位” 还有很多实例。
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