var speed_1=30; //数字越大速度越慢
var tab_0=document.getElementById("demoa");
var tab1_1=document.getElementById("demo1a");
var tab2_1=document.getElementById("demo2a");
tab2_1.innerHTML=tab1_1.innerHTML;
function Marquee(){
if(tab2_1.offsetWidth-tab_0.scrollLeft<=0)
tab_0.scrollLeft-=tab1_1.offsetWidth
else{
tab_0.scrollLeft++;
}
}
var MyMar=setInterval(Marquee,speed_1);
tab_0.onmouseover=function() {clearInterval(MyMar)};
tab_0.onmouseout=function() {MyMar=setInterval(Marquee,speed)};