一种网页进度条[网页特效]
循环不间断向上滚动的文本特效代码，可以当作网站公告也可以调整文字滚动的速度，还可以实现鼠标放上面停止滚动，鼠标离开又继续滚动。
<html>
<head>
<title>不间断循环向上滚动的文本特效</title>
</head>
<body>
<div id="marquees">
<a href="#">网页教学网knowsky.com欢迎您1</a><br>
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</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>