<script type="text/javascript">

var area = document.getElementById("moocBox");

var con1 = document.getElementById("con1");

var con2 = document.getElementById("con2");

//克隆con2的內(nèi)容,讓con2的內(nèi)容與con1完全相同！

con2.innerHTML = con1.innerHTML;

//設(shè)置滾動(dòng)距離

area.scrollTop = 0;

//判斷con1的位置

function scrollUp(){

if(area.scrollTop >= con1.scrollHeight) {

area.scrollTop = 0;

}else{

? ?area.scrollTop ++;?

}?

}

//定時(shí)器setInterval（）需要加入兩個(gè)值 第一個(gè)可以是公式，函數(shù)，第二個(gè)是時(shí)間

var speed = 50;

var myScroll = setInterval("scrollUp()",speed);

area.onmouseover = function(){

clearInterval(myScroll);

}

area.onmouseout = function(){

myScroll = setInterval("scrollUp()",speed);

}

</script>