这段代码是做什么用的啊?
<script> var speed=40
m0.innerHTML=mtext.innerHTML
function Marquee(){
if(m0.offsetTop-maq.scrollTop<=0)
maq.scrollTop-=mtext.offsetHeight
else{
maq.scrollTop++
}
}
var MyMar=setInterval(Marquee,speed)
maq.onmouseover=function() {clearInterval(MyMar)}
maq.onmouseout=function() {MyMar=setInterval(Marquee,speed)}