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Geekhub scrollTop

Geekhub 返回顶部

  1. // ==UserScript==
  2. // @name         Geekhub scrollTop
  3. // @namespace    http://wenyi.me
  4. // @version      0.4
  5. // @description  Geekhub 返回顶部
  6. // @author       SeaMonster
  7. // @match        https://*.geekhub.com/*
  8. // @grant        none
  9. // ==/UserScript==
  10.  
  11. try {
  12.     var body = document.body;
  13.     var div = document.createElement("div");
  14.     div.id = "myBtn";
  15.     div.setAttribute("style",
  16.         "display: none;position: fixed;bottom: 160px;right: 50px;z-index: 99; outline: none;background-color: #fff;color: #333;cursor: pointer;border-radius: 10px;box-shadow: 0 2px 4px 0 rgba(0,0,0,.05);"
  17.     );
  18.     div.innerHTML = '<button onclick="topFunction()" style="padding: 15px;" id="myBtn" title="回顶部">Top</button>';
  19.     body.appendChild(div);
  20. } catch (e) {
  21.     console.log("scroll Error");
  22. }
  23. // 当网页向下滑动 300px 出现"返回顶部" 按钮
  24. window.onscroll = function () {
  25.     scrollFunction()
  26. };
  27.  
  28. function scrollFunction() {
  29.     console.log(121);
  30.     if (document.body.scrollTop > 300 || document.documentElement.scrollTop > 300) {
  31.         document.getElementById("myBtn").style.display = "block";
  32.     } else {
  33.         document.getElementById("myBtn").style.display = "none";
  34.     }
  35. }
  36. // 点击按钮，返回顶部
  37. window.topFunction = function topFunction() {
  38.     (function smoothscroll() {
  39.         var currentScroll = document.documentElement.scrollTop || document.body.scrollTop;
  40.         if (currentScroll > 0) {
  41.             window.requestAnimationFrame(smoothscroll);
  42.             window.scrollTo(0, currentScroll - (currentScroll / 5));
  43.         }
  44.     })();
  45. }