js 公告无间隔循环向上滚动

公告栏里的公告列表向上滚动，是无间隔循环向上滚动的，不知道JS是怎么写的，谁有完整的例子吗，　谢谢大家． --------------------编程问答-------------------- <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head>

<body>

<div id="Div1" style="overflow: hidden; width: 128px; height: 100px;">
                            <div id="Div2">
                                a<br />a<br />a<br />a<br />a<br />a<br />a<br />
b
c
cd

                            </div>
                            <div id="Div3">
                            </div>
                        </div>

                        <script language="javascript">
                                 var speed=30
                                Div3.innerHTML=Div2.innerHTML

                                function Marquee(){
                                if(Div3.offsetTop-Div1.scrollTop<=0)
                                Div1.scrollTop-=Div2.offsetHeight
                                else{
                                Div1.scrollTop++
                                }
                                }
                                var MyMar=setInterval(Marquee,speed)
                                Div1.onmouseover=function() {clearInterval(MyMar)}
                                Div1.onmouseout=function() {MyMar=setInterval(Marquee,speed)}
                        </script>

</body>
</html>

把上面的代码保存成一个网页，运行试试！~~~~无缝隙，自动循环！~~~ --------------------编程问答--------------------

<style>a{display:block;font-size:15px};</style>

<div id="div1" style="width:300px;height:68px;overflow:hidden">

<a href="javascript:">1,你可曾有过无数的梦想，</a>

<a href="javascript:">2,却在时光的流逝里幻灭 </a>

<a href="javascript:">3,你可曾对未来期待憧憬，</a>

<a href="javascript:">4,却在成长的岁月中迷失</a>

<a href="javascript:">5,CSDN中国程序员论坛</a>

<a href="javascript:">6,大家一起来</a>

<a href="javascript:">7,好象都很不错的样子</a>

</div> 

<script>

var t=setInterval(myfunc,1000)

var d=document.getElementById("div1")

function myfunc(){

var o=d.firstChild

d.removeChild(o)

d.appendChild(o)

}

d.onmouseover=function(){clearInterval(t)}

d.onmouseout=function(){t=setInterval(myfunc,1000)}

</script>





2，



<div id="marquees">

   <a href="#">链接一</a><br>

   <br>

   <a href="#">链接二</a><br>

   <br>

   <a href="#">链接三</a><br>

   <br>

   <a href="#">链接四</a><br>

   <br>

</div> 

<script language="JavaScript">



marqueesHeight=200;

stopscroll=false;



with(marquees){

   style.width=0;

   style.height=marqueesHeight;

   style.overflowX="visible";

   style.overflowY="hidden";

   noWrap=true;

   onmouseover=new Function("stopscroll=true");

   onmouseout=new Function("stopscroll=false");

}

document.write('<div id="templayer" style="position:absolute;z-index:1;visibility:hidden"></div>');



preTop=0; currentTop=0; 



function init(){

   templayer.innerHTML="";

   while(templayer.offsetHeight<marqueesHeight){

     templayer.innerHTML+=marquees.innerHTML;

   }

   marquees.innerHTML=templayer.innerHTML+templayer.innerHTML;

   setInterval("scrollUp()",10);

}

document.body.onload=init;



function scrollUp(){

   if(stopscroll==true) return;

   preTop=marquees.scrollTop;

   marquees.scrollTop+=1;

   if(preTop==marquees.scrollTop){

     marquees.scrollTop=templayer.offsetHeight-marqueesHeight;

     marquees.scrollTop+=1;

   }

}

</script>

--------------------编程问答-------------------- JavaScript 无缝上下左右滚动加定高定宽停顿效果 --------------------编程问答--------------------

楼上的可以的试试吧

补充：.NET技术 ,  ASP.NET