area.innerHTML+=area.innerHTML;是什么意思?
<script>
var area=document.getElementById(“moocBox”);
var LiHeight=24;
area.innerHTML+=area.innerHTML;
area.scrollTop=0;
function scrollUp(){
area.scrollTop++;
if(area.scrollTop%LiHeight==0){
clearInterval(time);
}
}
Var time=setInterval(“scrollUp”,50);
</script>