var speed3=25 //速度数值越大速度越慢
demo2.innerHTML=demo1.innerHTML
function marquee(){
if(demo2.offsetWidth-demo.scrollLeft<0)
demo.scrollLeft-=demo1.offsetWidth
else{
demo.scrollLeft++
}
}
var MyMar=setInterval(marquee,speed3)
demo.onmouseover=function() {clearInterval(MyMar)}
demo.onmouseout=function() {MyMar=setInterval(marquee,speed3)}