https://www.nomura-cln-namba.jp/wp-content/themes/child/script/gotop.js

1$(document).ready(function(){
2
3    $(".gotop").hide();
4
5    $(window).on("scroll", function() {
6
7        if ($(this).scrollTop() > 100) {
8         $('.gotop').slideDown("fast");
9        } else {
10            $('.gotop').slideUp("fast");
11        }
12
13        scrollHeight = $(document).height();
14        scrollPosition = $(window).height() + $(window).scrollTop();
15        footHeight = $("footer").innerHeight();
16
17        if ( scrollHeight - scrollPosition  <= footHeight ) {
18            $(".gotop").css({
19                "position":"absolute",
20                "bottom": footHeight
21            });
22        } else {
23            $(".gotop").css({
24                "position":"fixed",
25                "bottom": "0px"
26            });
27        }
28    });
29
30    $('.gotop a').click(function () {
31        $('body,html').animate({
32        scrollTop: 0
33        }, 500);
34        return false;
35     });
36});