var?area=document.getElementById("moocBox");
	area.innerHTML+=area.innerHTML;
	scroll_byline(area,50,24,2000);
	function?scroll(element,speed,lineH){
		element.timer=setInterval(function(){
			if(element.scrollTop>=element.scrollHeight/2){
				element.scrollTop=0;//只在這里進行了初始化
			}
			element.scrollTop++;
			//提前終止
			if(element.scrollTop%lineH==0){
				clearInterval(element.timer);
			}
		},speed)
	}
	function?scroll_byline(element,speed,lineH,delay){
		setInterval(function(){
		clearInterval(element.timer);
		scroll(element,speed,lineH);
		},delay)
	}