https://09women.cn/js/default/CN/Frontend/Layout/layout.js

1var name = "#Rfloating";
2var y = null;
3$(function(){
4
5
6    // name exists
7    if (document.getElementById(name.replace('#', ''))) {
8        y = parseInt($(name).css("top").substring(0,$(name).css("top").indexOf("px")))
9        function scrollit() {
10            offset = y + $(document).scrollTop();
11            gap = (offset + $(name).height()) - ($(window).height() + $(document).scrollTop());
12            // hit bottom
13            if (gap > 0) {
14                offset -= gap;
15            }
16            // hit top (original y offset)
17            if (offset < y) {
18                offset = y;
19            }
20            offset += "px";
21            $(name).animate({
22                top:offset
23            },{
24                duration:500,
25                queue:false
26            });
27        }
28        $(window).scroll(scrollit);
29        scrollit();
30    }
31});