<!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></title>
</head>
<body>
<script type="text/javascript">

var $ = function (id)
{
return "string" == typeof id ? document.getElementById(id) : id;
};


var Class =
{

create: function()
{

return function()
{
this.initialize.apply(this, arguments);
}
}
}


Object.extend = function(destination, source)
{

for (var property in source)
{
destination[property] = source[property];
}
return destination;
}


function addEventHandler(oTarget, sEventType, fnHandler)
{

if (oTarget.addEventListener)
{
oTarget.addEventListener(sEventType, fnHandler, false);

} else if (oTarget.attachEvent)
{
oTarget.attachEvent("on" + sEventType, fnHandler);

} else
{
oTarget["on" + sEventType] = fnHandler;
}
};


var Scroller = Class.create();

Scroller.prototype =
{

initialize: function(idScroller, idScrollMid, options)
{
var oScroll = this, oScroller = $(idScroller), oScrollMid = $(idScrollMid);
this.heightScroller = oScroller.offsetHeight;
this.heightList = oScrollMid.offsetHeight;
if(this.heightList <= this.heightScroller) return;
oScroller.style.overflow = "hidden";
oScrollMid.appendChild(oScrollMid.cloneNode(true));
this.oScroller = oScroller;
this.timer = null;
this.SetOptions(options);
this.side = 1;//1是上 -1是下

switch (this.options.Side)
{
case "down" :
this.side = -1;
break;
case "up" :
default :
this.side = 1;
}

addEventHandler(oScrollMid , "mouseover", function()
{ oScroll.Stop(); });

addEventHandler(oScrollMid , "mouseout", function()
{ oScroll.Start(); });
if(this.options.PauseStep <= 0 || this.options.PauseHeight <= 0) this.options.PauseStep = this.options.PauseHeight = 0;
this.Pause = 0;
this.Start();
},
//设置默认属性

SetOptions: function(options)
{

this.options =
{//默认值
Step: 1,//每次变化的px量
Time: 20,//速度(越大越慢)
Side: "up",//滚动方向:"up"是上,"down"是下
PauseHeight: 0,//隔多高停一次
PauseStep: 1000//停顿时间(PauseHeight大于0该参数才有效)
};

Object.extend(this.options, options ||
{});
},
//滚动

Scroll: function()
{
var iScroll = this.oScroller.scrollTop, iHeight = this.heightList, time = this.options.Time, oScroll = this, iStep = this.options.Step * this.side;

if(this.side > 0)
{

if(iScroll >= (iHeight * 2 - this.heightScroller))
{ iScroll -= iHeight; }

} else
{

if(iScroll <= 0)
{ iScroll += iHeight; }
}

if(this.options.PauseHeight > 0)
{

if(this.Pause >= this.options.PauseHeight)
{
time = this.options.PauseStep;
this.Pause = 0;

} else
{
this.Pause += Math.abs(iStep);
this.oScroller.scrollTop = iScroll + iStep;
}

} else
{ this.oScroller.scrollTop = iScroll + iStep; }

this.timer = window.setTimeout(function()
{ oScroll.Scroll(); }, time);
},
//开始

Start: function()
{
this.Scroll();
},
//停止

Stop: function()
{
clearTimeout(this.timer);
}
};


window.onload = function()
{

new Scroller("idScroller", "idScrollMid",
{ PauseHeight:25 });
}
</script>
<style>

#idScroller *
{margin:0px; padding:0px;}

#idScroller
{line-height:25px;width:500px; height:50px; overflow:hidden; border:1px solid #000000;}

#idScroller ul
{width:100%}

#idScroller li
{width:50%; float:left; overflow:hidden; list-style:none;}
</style>
<div id="idScroller">
<div id="idScrollMid">
<ul>
<li><a href="http://shundebk.cn/">111111111111111111111</a></li>
<li><a href="http://shundebk.cn/">211111111111111111111</a></li>
<li><a href="http://shundebk.cn/">311111111111111111111</a></li>
<li><a href="http://shundebk.cn/">411111111111111111111</a></li>
<li><a href="http://shundebk.cn/">511111111111111111111</a></li>
<li><a href="http://shundebk.cn/">611111111111111111111</a></li>
</ul>
<div style="clear:both;"></div>
</div>
</div>
</body>
</html>
效果
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