var speed2=30; //数字越大速度越慢
var tab=document.getElementById("demo");
var tab1=document.getElementById("demo1");
var tab2=document.getElementById("demo2");
tab2.innerHTML=tab1.innerHTML;
function Marquee2(){
if(tab2.offsetWidth-tab.scrollLeft<=0)
tab.scrollLeft-=tab1.offsetWidth
else{
tab.scrollLeft++;
}
}
var MyMar2=setInterval(Marquee2,speed2);
tab.onmouseover=function() {clearInterval(MyMar2)};
tab.onmouseout=function() {MyMar2=setInterval(Marquee2,speed2)};