var speed3=10//速度数值越大速度越慢
demoa2.innerHTML=demoa1.innerHTML
function Marquee(){
if(demoa2.offsetWidth-demoa.scrollLeft<=0)
demoa.scrollLeft-=demoa1.offsetWidth
else{
demoa.scrollLeft++
}
}
var MyMar=setInterval(Marquee,speed3)
demoa.onmouseover=function() {clearInterval(MyMar)}
demoa.onmouseout=function() {MyMar=setInterval(Marquee,speed3)}