JS与HTML结合使用marquee标签实现无缝滚动效果代码

具体代码如下所示：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
"http://www.w3c.org/TR/1999/REC-html401-19991224/loose.dtd">
<HTML xmlns="http://www.w3.org/1999/xhtml">
<HEAD>
<TITLE>一行多列文字循环滚动带停顿-</TITLE>
<meta name="keywords" content="网页特效" />
<meta name="description" content="" />
<META http-equiv=Content-Type content="text/html; charset=utf-8">
<style type="text/css">
ul {height:200px;
padding-right: 0px;
padding-left: 0px;
padding-bottom: 0px;
margin: 0px;
padding-top: 0px
}
#announcement {
width:300px;
height:200px;
background:url(img/menu_bg.gif) repeat;
overflow: hidden;
}
#announcement div {
border: #e6e6e6 1px solid;
padding:0px 10px 0px 10px;
overflow-y:hidden;
line-height: 24px;
height:100px;
}
#announcement li {
font-size: 12px;
float: left;
list-style-type: none;
margin-right: 20px;
padding-left: 10px;
background: url(img/arrow_right.gif) no-repeat 0px 50%;
white-space: nowrap
}
#announcement a {
text-decoration: none;
}
#announcement a:hover {
text-decoration:underline;
}
</style>
</HEAD>
<BODY>
<DIV id="announcement" onMouseOver="if(!anncount) {clearTimeout(annst);annst = 0}" onMouseOut="if(!annst) annst = setTimeout('announcementScroll()', anndelay);">
<DIV id="scrbody">
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</DIV>
</DIV>
<script type="text/javascript">
function $(id)
{
return document.getElementById(id);
}
var anndelay = 3000;
var anncount = 0;
var annheight = 24;
var annst = 0;
function announcementScroll()
{
if( ! annst)
{
$('scrbody').innerHTML += '<br style="clear: both" />' + 
$('scrbody').innerHTML;
$('scrbody').scrollTop = 0;
if($('scrbody').scrollHeight > annheight * 3)
{
annst = setTimeout('announcementScroll()', anndelay);
}
else
{
$('announcement').onmouseover = $('announcement').onmouseout = null;
}
return;
}
if(anncount == annheight)
{
if($('scrbody').scrollHeight - annheight <= $('scrbody').scrollTop)
{
$('scrbody').scrollTop = $('scrbody').scrollHeight / 2 - annheight;
}
anncount = 0;
annst = setTimeout('announcementScroll()', anndelay);
}
else
{
$('scrbody').scrollTop ++ ;
anncount ++ ;
annst = setTimeout('announcementScroll()', 10);
}
}
announcementScroll();
</script>
</BODY>
</HTML>
JS与HTML结合使用marquee标签实现无缝滚动效果代码

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