https://www.blackstoneresort.com/jj/static/share/js/parallax-scroll.jquery.js

1$.fn.parscroll = function (spd) {
2
3	var agent = navigator.userAgent.toLowerCase();
4	if ( (navigator.appName == 'Netscape' && agent.indexOf('trident') != -1) || (agent.indexOf("msie") != -1)) {// ie일 경우
5	     
6	}else{// ie가 아닐 경우
7        var opt = $.extend({}, spd);
8        opt.speed===void 0&&(opt.speed=.3);
9        this.each(function() {
10        	var t = $(this);
11
12            function init() {
13            	var title = t.data("title");
14                var img = t.attr('style').replace('background-image:url(','').replace(')','');
15            	console.log(img);
16                t.append('<div class="ps-bg-wrap"><div class="ps-bg" style="background-image:url('+img+')"></div></div>')
17        
18                if (title !== undefined) {
19                    t.prepend('<div class="item-title">'+title+'}</div>')
20                }
21            }
22            function scroll() {
23            	var scrolltop = $(window).scrollTop(),
24                         offsettop = t.offset().top;
25        
26                if (offsettop + t.outerHeight() > scrolltop && scrolltop + $(window).height() > offsettop) {
27                    t.find(".ps-bg").css("transform", 'translateY(' + -opt.speed * (scrolltop - offsettop) + 'px)')
28                }
29            }
30            init(), scroll(), $(window).scroll(scroll)
31        })
32	}
33
34}