当浮动框移动到浏览器边缘时，跟随一起滚动

$.fn.smartFloat = function() {
var position = function(element){
var abLeft=$(element).css("left"); //当为ablute时的left相对初始值
var fixeLeft=$(element).offset().left+"px"; //在整个页面的绝对值
var top = element.position().top;
var pos = element.css("position");
$(window).scroll(function() {
var scrolls = $(this).scrollTop();
if (scrolls > top) {
if (window.XMLHttpRequest) {
element.css({
position: "fixed",
top: 0,
left:fixeLeft
});
} else {
element.css({
top: scrolls
});
}

}else {
element.css({
position: pos,
top: top,
left:abLeft
});
}
});
};
return $(this).each(function() {
position($(this));
});
};

<script type="text/javascript">

$(".count-box").smartFloat();

</script>