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为页面添加按钮，平滑的滚动到顶部/底部
// ==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 troy450409405@gmail.com|alipay.com
// @namespace https://greasyfork.org/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);