var speed=30; //数字越大速度越慢
var tab_1=document.getElementById("demo_1");
var tab1_1=document.getElementById("demo1_1");
var tab2_1=document.getElementById("demo2_1");
tab2_1.innerHTML=tab1_1.innerHTML;
function Marquee(){
if(tab2_1.offsetWidth-tab_1.scrollLeft<=0)
tab_1.scrollLeft-=tab1_1.offsetWidth
else{
tab_1.scrollLeft++;
}
}
var MyMar=setInterval(Marquee,speed);
tab_1.onmouseover=function() {clearInterval(MyMar)};
tab_1.onmouseout=function() {MyMar=setInterval(Marquee,speed)};// JavaScript Document