var speed3=20//速度数值越大速度越慢
 var t=false;
 var id="aa";
 document.getElementById("demo2").innerHTML=document.getElementById("demo1").innerHTML
 function Marquee(){
 if(document.getElementById("demo2").offsetWidth-document.getElementById("demo").scrollLeft<=0)
 document.getElementById("demo").scrollLeft-=document.getElementById("demo1").offsetWidth
 else{
 document.getElementById("demo").scrollLeft++
 }
 t=false;
 }
 function RMarquee(){ 
 if(document.getElementById("demo").scrollLeft<=0)
   document.getElementById("demo").scrollLeft+=document.getElementById("demo2").offsetWidth
   else{
   document.getElementById("demo").scrollLeft--
   }
   t=true;

 }
 function clickdiv(){
 clearInterval(MyMar)
 Marquee();
 }
 function Rclickdiv(){
 clearInterval(MyMar)
 RMarquee();
 }
 var MyMar=setInterval(Marquee,speed3)
 document.getElementById("demo").onmouseover=function() {clearInterval(MyMar)}
 document.getElementById("demo").onmouseout=function() {if(t){MyMar=setInterval(RMarquee,speed3)}else{MyMar=setInterval(Marquee,speed3)}}
 document.getElementById('mcc').onmouseout=function(){clearInterval(MyMar);MyMar=setInterval(RMarquee,speed3);}
 document.getElementById('aa').onmouseout=function(){clearInterval(MyMar);MyMar=setInterval(Marquee,speed3);}