var speed3=25;//速度数值越大速度越慢
var oDemo2=document.getElementById("demo2");
var oDemo1=document.getElementById("demo1");
var oDemo=document.getElementById("demo");

/*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)}
*/

oDemo2.innerHTML=oDemo1.innerHTML
function Marquee(){
if(oDemo2.offsetWidth-oDemo.scrollLeft<=0)
oDemo.scrollLeft-=oDemo1.offsetWidth
else{
oDemo.scrollLeft++
}
}
var MyMar=setInterval(Marquee,speed3)
oDemo.onmouseover=function() {clearInterval(MyMar)}
oDemo.onmouseout=function() {MyMar=setInterval(Marquee,speed3)}