https://pilgrimsurfsupply.jp/js/libs/jquery-contained-sticky-scroll-min.js

1/*!
2 * Contained Sticky Scroll v1.1
3 * http://blog.echoenduring.com/2010/11/15/freebie-contained-sticky-scroll-jquery-plugin/
4 *
5 * Copyright 2010, Matt Ward
6*/
7(function($){$.fn.containedStickyScroll=function(options){var defaults={unstick:true,easing:'linear',duration:500,queue:false,closeChar:'^',closeTop:0,closeRight:0}
8var options=$.extend(defaults,options);var $getObject=$(this).selector;if(options.unstick==true){this.css('position','relative');this.append('<a class="scrollFixIt">'+options.closeChar+'</a>');jQuery($getObject+' .scrollFixIt').css('position','absolute');jQuery($getObject+' .scrollFixIt').css('top',options.closeTop+'px');jQuery($getObject+' .scrollFixIt').css('right',options.closeTop+'px');jQuery($getObject+' .scrollFixIt').css('cursor','pointer');jQuery($getObject+' .scrollFixIt').click(function(){jQuery($getObject).animate({top:"0px"},{queue:options.queue,easing:options.easing,duration:options.duration});jQuery(window).unbind();jQuery('.scrollFixIt').remove();});}
9jQuery(window).scroll(function(){if(jQuery(window).scrollTop()>(jQuery($getObject).parent().offset().top)&&(jQuery($getObject).parent().height()+jQuery($getObject).parent().position().top-30)>(jQuery(window).scrollTop()+jQuery($getObject).height())){jQuery($getObject).animate({top:(jQuery(window).scrollTop()-jQuery($getObject).parent().offset().top)+"px"},{queue:options.queue,easing:options.easing,duration:options.duration});}
10else if(jQuery(window).scrollTop()<(jQuery($getObject).parent().offset().top)){jQuery($getObject).animate({top:"0px"},{queue:options.queue,easing:options.easing,duration:options.duration});}});};})(jQuery);