[转]不间断连续图片滚动效果的制作方法(JS)

From: http://x8.maicoo.com/tech/9/225.html

以前我们站点也介绍过连续滚动的图片，但缺陷是有间断。如何制作连续不间断的播放滚动呢？请参看制作方法：
　　先制作向上滚动的效果：(演示：http://x8.maicoo.com/tech/9/225.html)

<!-- 指向链接图片url -->
<base href="http://www.it365cn.com">
<div id=demo style=overflow:hidden;height:150;width:90;background:#214984;color:#ffffff>
<div id=demo1>
<!-- 定义图片 -->
<img src="images/logo_1.gif">
<img src="images/logo/flashempire.gif">
<img src="images/logo.gif">
<img src="images/logo/5dmedia.gif">
<img src="images/logo/macromedia.gif">
<img src="images/logo/sucaiw.gif">
<img src="images/logo/blueieda.gif">
<img src="images/logo/htmlcn.gif">
<img src="images/logo/fwcn.gif">
</div>
<div id=demo2></div>
</div>

<script>
var speed=30
demo2.innerHTML=demo1.innerHTML
function Marquee(){
if(demo2.offsetTop-demo.scrollTop<=0)
demo.scrollTop-=demo1.offsetHeight
else{
demo.scrollTop++
}
}
var MyMar=setInterval(Marquee,speed)
demo.onmouseover=function() {clearInterval(MyMar)}
demo.onmouseout=function() {MyMar=setInterval(Marquee,speed)}
</script>

制作向下滚动的效果：
　　将上面“制作向上滚动的效果”中的红色字体Js部分替换成：

<script>
var speed=30
demo2.innerHTML=demo1.innerHTML
demo.scrollTop=demo.scrollHeight
function Marquee(){
if(demo1.offsetTop-demo.scrollTop>=0)
demo.scrollTop+=demo2.offsetHeight
else{
demo.scrollTop--
}
}
var MyMar=setInterval(Marquee,speed)
demo.onmouseover=function() {clearInterval(MyMar)}
demo.onmouseout=function() {MyMar=setInterval(Marquee,speed)}
</script>

制作向左滚动的效果：

<base href="http://www.it365cn.com">
<div id=demo style=overflow:hidden;height:33;width:500;background:#214984;color:#ffffff>
<table align=left cellpadding=0 cellspace=0 border=0>
<tr>
<td id=demo1 valign=top><img src="images/logo_1.gif"><img src="images/logo/flashempire.gif"><img src="images/logo.gif"><img src="images/logo/5dmedia.gif"><img src="images/logo/macromedia.gif"><img src="images/logo/sucaiw.gif"><img src="images/logo/blueieda.gif"><img src="images/logo/htmlcn.gif"><img src="images/logo/fwcn.gif">
</td>
<td id=demo2 valign=top></td>
</tr>
</table>
</div>

<script>
var speed=30
demo2.innerHTML=demo1.innerHTML
function Marquee(){
if(demo2.offsetWidth-demo.scrollLeft<=0)
demo.scrollLeft-=demo1.offsetWidth
else{
demo.scrollLeft++
}
}
var MyMar=setInterval(Marquee,speed)
demo.onmouseover=function() {clearInterval(MyMar)}
demo.onmouseout=function() {MyMar=setInterval(Marquee,speed)}
</script>

制作向右滚动的效果：
　　将上面“制作向左滚动的效果”中的红色字体Js部分替换成：

<base href="http://www.it365cn.com">
<div id=demo style=overflow:hidden;height:33;width:500;background:#214984;color:#ffffff>
<table align=left cellpadding=0 cellspace=0 border=0>
<tr>
<td id=demo1 valign=top><img src="images/logo_1.gif"><img src="images/logo/flashempire.gif"><img src="images/logo.gif"><img src="images/logo/5dmedia.gif"><img src="images/logo/macromedia.gif"><img src="images/logo/sucaiw.gif"><img src="images/logo/blueieda.gif"><img src="images/logo/htmlcn.gif"><img src="images/logo/fwcn.gif">
</td>
<td id=demo2 valign=top></td>
</tr>
</table>
</div>
<script>
var speed=30
demo2.innerHTML=demo1.innerHTML
demo.scrollLeft=demo.scrollWidth
function Marquee(){
if(demo.scrollLeft<=0)
demo.scrollLeft+=demo2.offsetWidth
else{
demo.scrollLeft--
}
}
var MyMar=setInterval(Marquee,speed)
demo.onmouseover=function() {clearInterval(MyMar)}
demo.onmouseout=function() {MyMar=setInterval(Marquee,speed)}
</script>