var speed  = 1;//滚动速度
  var rows  = 211;//每行高度
  var stim  = 200; //停留时间倍数 * speed
  var stop  = 0; //初始化值，不管
  
  demo2.innerHTML = demo1.innerHTML
  function Marquee(){
    if(demo.scrollTop%rows==0 && stop<=stim){
      stop++;
      return;
    }
    stop = 0;
    if(demo2.offsetTop-demo.scrollTop<=0)
      demo.scrollTop-=demo1.offsetHeight
    else{
      demo.scrollTop++
    }
  }
  var MyMar    = setInterval(Marquee,speed)
  demo.onmouseover = function() {clearInterval(MyMar)}
  demo.onmouseout  = function() {MyMar=setInterval(Marquee,speed)}