var speed=30;//数字越大速度越慢
var FGDemo=document.getElementById('demoa');
var FGDemo1=document.getElementById('demoa1');
var FGDemo2=document.getElementById('demoa2');
FGDemo2.innerHTML=FGDemo1.innerHTML
function Marquee1(){
if(FGDemo2.offsetHeight-FGDemo.scrollTop<=0)
FGDemo.scrollTop-=FGDemo1.offsetHeight
else{
FGDemo.scrollTop++}}
var MyMar1=setInterval(Marquee1,speed)
FGDemo.onmouseover=function() {clearInterval(MyMar1)}
FGDemo.onmouseout=function() {MyMar1=setInterval(Marquee1,speed)}