// JavaScript Document
var speedn=60; //数字越大速度越慢
var tabn=document.getElementById("newdemo");
var tabn1=document.getElementById("newdemo1");
var tabn2=document.getElementById("newdemo2");
tabn2.innerHTML=tabn1.innerHTML; //克隆demo1为demo2
function Marqueen(){
if(tabn2.offsetTop-tabn.scrollTop<=0)//当滚动至demo1与demo2交界时
tabn.scrollTop-=tabn1.offsetHeight //demo跳到最顶端
else{
tabn.scrollTop++
}
}
var MyMarn=setInterval(Marqueen,speedn);
tabn.onmouseover=function() {clearInterval(MyMarn)};//鼠标移上时清除定时器达到滚动停止的目的
tabn.onmouseout=function() {MyMarn=setInterval(Marqueen,speedn)};//鼠标移开时重设定时器