基于jquery的滚动固定位置广告位插件，支持自定义偏移量。 用法： window.onscroll=function(){floatWin("branding","right","top")} window.onscroll=function(){floatWin("branding","left","top")} window.onscroll=function(){floatWin("branding","right","bottom")} window.onscroll=function(){floatWin("branding","left","bottom")} 支持div