var speed1=100000//速度数值越大速度越慢
  demo5.innerHTML=demo4.innerHTML
  function Marquee1(){
  if(demo3.scrollLeft<=0)
  demo3.scrollLeft+=demo5.offsetWidth
  else{
  demo3.scrollLeft--
  }
  }
  var MyMar1=setInterval(Marquee1,speed1)
  demo3.onmouseover=function() {clearInterval(MyMar1)}
  demo3.onmouseout=function() {MyMar1=setInterval(Marquee1,speed1)}