Gadget:backToTop.js
// From 萌娘百科
"use strict";
$(function () {
var btn = insertToBottomRightCorner("返回顶部").attr({
title: "返回顶部",
id: "backToTop"
}).css({
"user-select": "none",
transition: "opacity .13s ease-in-out",
order: "998"
}).on("click", function () {
$("html, body").animate({
scrollTop: 0
}, 130);
});
var $document = $(document);
$(window).on("scroll", function () {
btn.css("opacity", $document.scrollTop() > 0 ? ".6" : "0");
}).trigger("scroll");
});