js页面滚动浮动层智能定位(MooTools)实例页面

HTML代码：

<div class="float" id="float">
我是个腼腆羞涩的浮动层...
</div>

JS代码：

var $smartFloat = function(elements) {
var position = function(element) {
var top = element.getPosition().y, pos = element.getStyle("position");
window.addEvent("scroll", function() {
var scrolls = this.getScroll().y;
if (scrolls > top) {
if (window.XMLHttpRequest) {
element.setStyles({
position: "fixed",
top: 0
});
} else {
element.setStyles({
top: scrolls
});
}
}else {
element.setStyles({
position: "absolute",
top: top
});
}
});
};
if ($type(elements) === "array") {
return elements.each(function(items) {
position(items);
});
} else if ($type(elements) === "element") {
position(elements);
}
};

//绑定
$smartFloat($("float"));
转至：http://www.zhangxinxu.com/wordpress/?p=1242