- // JavaScript Document
- function goTopEx(){
- var obj=document.getElementById("goTopBtn");
- function getScrollTop(){
- return document.documentElement.scrollTop;
- }
- function setScrollTop(value){
- document.documentElement.scrollTop=value;
- }
- window.onscroll=function(){getScrollTop()>0?obj.style.display="":obj.style.display="none";}
- obj.onclick=function(){
- var goTop=setInterval(scrollMove,10);
- function scrollMove(){
- setScrollTop(getScrollTop()/1.1);
- if(getScrollTop()<1)clearInterval(goTop);
- }
- }
- }
来源: http://www.phpxs.com/code/1003978/