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

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)}