// JScript 文件
    var speed=20;
    
    document.getElementById("demo2").innerHTML=document.getElementById("demo1").innerHTML;    //克隆demo1为demo2
    
    function Marquee(){
        if(document.getElementById("demo2").offsetWidth  <= document.getElementById("demo").scrollLeft){    //当滚动至demo1与demo2交界时
            document.getElementById("demo").scrollLeft = document.getElementById("demo").scrollLeft - document.getElementById("demo1").offsetWidth;        //demo跳到最顶端
        }
        else{
            document.getElementById("demo").scrollLeft++;
        }
    }
    var MyMar=setInterval(Marquee,speed);    //设置定时器
    document.getElementById("demo").onmouseover=function() {clearInterval(MyMar);}//鼠标移上时清除定时器达到滚动停止的目的
    document.getElementById("demo").onmouseout=function() {MyMar=setInterval(Marquee,speed);}//鼠标移开时重设定时器
    
  /* 改变颜色*/
  function changeColor(obj)
  {
    obj.style.background='#F5FAFE';
  }
  function changeColorNull(obj)
  {
  obj.style.background='';
  }
 /*over*/