JS左右无缝滚动（一般方法+面向对象方法）

代码如下:

<!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=GBK" />
<title>JS左右无缝滚动（一般方法+面向对象方法）</title>
<style type="text/css">
.clearfix:after {content:"."; display:block; height:0; visibility:hidden; clear:both; }
.clearfix { *zoom:1; }
body{background:gray;}
#wrap{width:810px; height:160px;
border:1px solid black;
position:relative;
left:50%;
top:50%;
margin-left:-410px;
margin-top:200px;
background:#fff;
overflow:hidden;}
#wrap ul{margin:0px;
padding:0px;
position:absolute;
top:0px;
left:0px;}
#wrap ul li{ list-style:none; float:left;margin:5px 10px;width:265px;}
#wrap ul li img{ border:1px black solid; padding:10px;}
</style>
<!--script type="text/javascript">
window.onload=function(){ //一般方法
var wrap=document.getElementById("wrap");
var wrap_ul=wrap.getElementsByTagName("ul")[0];
var wrap_li=wrap.getElementsByTagName("li");
wrap_ul.innerHTML+=wrap_ul.innerHTML;
wrap_ul.style.width=(wrap_li[0].offsetWidth+20)*wrap_li.length+"px";
Autoscroll=setInterval(scroll,100);
function scroll(){
wrap_ul.style.left=wrap_ul.offsetLeft-3+"px"; //这里因为ie对offsetLeft的解析不一样，所以ie下必须减大于等于3的数
if(wrap_ul.offsetLeft<=-wrap_ul.offsetWidth/2){
wrap_ul.style.left="0px";
}else if(wrap_ul.offsetLeft>=0){
wrap_ul.style.left=-wrap_ul.offsetWidth/2+"px";
}
}
wrap.onmouseover=function(){
clearInterval(Autoscroll);
}
wrap.onmouseout=function(){
Autoscroll=setInterval(scroll,100);
}
}
</script-->
<script type="text/javascript">
function Slide(obj,direction,speed){ //面向对象的方法，可以自由控制方向，speed=>3 ie下可以
this.container=document.getElementById(obj);
this.content=this.container.getElementsByTagName("ul")[0];
this.lis=this.content.getElementsByTagName("li");
this.content.innerHTML+=this.content.innerHTML;
this.content.style.width=(this.lis[0].offsetWidth+20)*this.lis.length+"px";
var that=this
if(direction=="left"){
this.speed=-speed
}else if(direction=="right"){
this.speed=speed
}
Slide.prototype.scroll=function(){
this.content.style.left=this.content.offsetLeft+this.speed+"px";
if(this.content.offsetLeft <= -this.content.offsetWidth/2){
this.content.style.left ="0px";
}else if(this.content.offsetLeft >=0){
this.content.style.left = -this.content.offsetWidth/2 + "px";
}
}
this.time=setInterval(function(){that.scroll()},100);
this.container.onmouseover=function(){
clearInterval(that.time);
}
this.container.onmouseout=function(){
that.time=setInterval(function(){that.scroll()},100);
}
}
</script>
<script type="text/javascript">
window.onload=function(){new Slide("wrap","left",5)}
</script>

</head>

<body>
<div id="wrap">
<ul class="clearfix">
<li><a href="#"><img src="http://www.baidu.com/img/baidu_sylogo1.gif" /></a></li>
<li><a href="#"><img src="http://www.baidu.com/img/baidu_sylogo1.gif" /></a></li>
<li><a href="#"><img src="http://www.baidu.com/img/baidu_sylogo1.gif" /></a></li>
<li><a href="#"><img src="http://www.baidu.com/img/baidu_sylogo1.gif" /></a></li>
<li><a href="#"><img src="http://www.baidu.com/img/baidu_sylogo1.gif" /></a></li>
</ul>
</div>
</body>
</html>