为页面添加按钮，平滑的滚动到顶部/底部
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// ==UserScript== // @name Lite Add button for Smooth Scroll to the top / bottom // @author burningall // @description 为页面添加按钮，平滑的滚动到顶部/底部 // @version 2015.8.1 // @include * // @supportURL http://www.burningall.com // @contributionURL [email protected]|alipay.com // @namespace https://greatest.deepsurf.us/zh-CN/users/3400-axetroy // ==/UserScript== //=======快捷键====== //alt+1>>>>>>回到顶部 //alt+2>>>>>>去到底部 (function(document){ //================公共函数区============ function addEvent(obj, event, fn) {return obj.addEventListener ? obj.addEventListener(event, fn, false) : obj.attachEventListener("on" + event, fn);} function getSize(obj) {return document.documentElement[obj]!==0 ? document.documentElement[obj]: document.body[obj];} function scroll(obj,dir){//obj随意，dir>0往上滚，dir<0往下滚 clearInterval(obj.timerScroll); obj.timerScroll=setInterval(function(){ var position,speed; if(dir>0){//往上滚动 speed = (getSize('scrollTop') / 10) + 1; position = getSize('scrollTop') - speed; if (position <= 0) {//如果滚到顶部 document.body.scrollTop = document.documentElement.scrollTop = 0; clearInterval(obj.timerScroll); console.timeEnd('hello'); } }else{//往下滚动 speed = ((getSize('scrollHeight')-getSize('scrollTop')-getSize('clientHeight')) / 10) + 1; position = getSize('scrollTop') + speed; if (position + getSize('clientHeight') >= getSize('scrollHeight')) {//如果滚到底部 document.body.scrollTop = document.documentElement.scrollTop = getSize('scrollHeight'); clearInterval(obj.timerScroll); } } document.body.scrollTop = document.documentElement.scrollTop = position; },20); } //================快捷键区============ addEvent(document,'keydown',function(e){ e=e || window.top.event; if(e.altKey && e.keyCode == 49){//alt+1，向上滚动 scroll(document,1); }else if(e.altKey && e.keyCode == 50) { //alt+2，向下滚动 scroll(document,-1); } }); })(document);
