rainyjune/gist:94ed1aaf1cdaa4bf679e

## gistfile1.js
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Js图片无缝滚动</title>
<style type="text/css">
body{
background:gray;
}
#wrap{
width:810px;
height:200px;
border:1px solid black;
position:relative;
/*
left:50%;
top:50%;
margin-left:-410px;
margin-top:-250px;
*/
margin-left: auto;
margin-right: auto;
background:#F5E0E3;
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;
}
#wrap ul li img{
width:250px;
height:180px;
cursor:pointer;
}
.direction{
width:104px;
margin:50px auto;
}
.direction img{
border:1px dotted pink;
cursor:pointer;
}
.active{
border:2px solid gray;
}
</style>
<script type="text/javascript">
window.onload = initAll;
function initAll(){
	var ul = document.getElementById("wrap").getElementsByTagName("ul")[0];
	var lis = ul.getElementsByTagName("li");
	var btn1 = document.getElementById("button1");
	var btn2 = document.getElementById("button2");
	var imgs = ul.getElementsByTagName("img");
	var speed = 3;
	var time = null;
  var activeImg = null;

	ul.innerHTML += ul.innerHTML;
  var ulWidth = (lis[0].offsetWidth+20)*lis.length + "px";
	ul.style.width = ulWidth;

  function moveFunction() {
    ul.style.left = ul.offsetLeft - speed + "px";
		if(ul.offsetLeft <= -ul.offsetWidth/2){
			ul.style.left ="0px";
		}else if(ul.offsetLeft >=0){
			ul.style.left = -ul.offsetWidth/2 + "px";
		}
  }

	time = setInterval(moveFunction,30);

	btn1.onmouseover = function(){
		speed = 3;
	};
	btn2.onmouseover = function(){
		speed = -3;
	};

  ul.onmouseover = function(e) {
    clearInterval(time);
    e = e || window.event;
    var source = e.target || e.srcElement;
    var sourceTagName = source.tagName;

    console.log("source:", source.tagName);

    if (sourceTagName.toLowerCase() == "img") {
      activeImg = source;
      activeImg.className = "active";
    }

    if (e.stopPropagation) {
      e.stopPropagation();
    } else {
      e.cancelBubble = true;
    }
    return false;
  };

  ul.onmouseout = function() {
    time = setInterval(moveFunction,30);
    if (activeImg) {
      activeImg.className = "none";
      activeImg = null;
    }
  };
}
</script>
</head>
<body>
<div class="direction"><img src="/jscss/demoimg/201204/left.png" alt="" id="button1"/><img src="/jscss/demoimg/201204/right.png" alt="" id="button2"/></div>
<div id="wrap">
<ul>
<li><img src="http://www.codefans.net/jscss/demoimg/wall1.jpg" alt="pic one" /></li>
<li><img src="http://www.codefans.net/jscss/demoimg/wall2.jpg" alt="pic two" /></li>
<li><img src="http://www.codefans.net/jscss/demoimg/wall3.jpg" alt="pic three" /></li>
<li><img src="http://www.codefans.net/jscss/demoimg/wall4.jpg" alt="pic four" /></li>
</ul>
</div>
</body>
</html>
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8" />
	<title>Js图片无缝滚动</title>
	<style type="text/css">
	body{
	background:gray;
	}
	#wrap{
	width:810px;
	height:200px;
	border:1px solid black;
	position:relative;
	/*
	left:50%;
	top:50%;
	margin-left:-410px;
	margin-top:-250px;
	*/
	margin-left: auto;
	margin-right: auto;
	background:#F5E0E3;
	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;
	}
	#wrap ul li img{
	width:250px;
	height:180px;
	cursor:pointer;
	}
	.direction{
	width:104px;
	margin:50px auto;
	}
	.direction img{
	border:1px dotted pink;
	cursor:pointer;
	}
	.active{
	border:2px solid gray;
	}
	</style>
	<script type="text/javascript">
	window.onload = initAll;
	function initAll(){
	var ul = document.getElementById("wrap").getElementsByTagName("ul")[0];
	var lis = ul.getElementsByTagName("li");
	var btn1 = document.getElementById("button1");
	var btn2 = document.getElementById("button2");
	var imgs = ul.getElementsByTagName("img");
	var speed = 3;
	var time = null;
	var activeImg = null;

	ul.innerHTML += ul.innerHTML;
	var ulWidth = (lis[0].offsetWidth+20)*lis.length + "px";
	ul.style.width = ulWidth;

	function moveFunction() {
	ul.style.left = ul.offsetLeft - speed + "px";
	if(ul.offsetLeft <= -ul.offsetWidth/2){
	ul.style.left ="0px";
	}else if(ul.offsetLeft >=0){
	ul.style.left = -ul.offsetWidth/2 + "px";
	}
	}

	time = setInterval(moveFunction,30);

	btn1.onmouseover = function(){
	speed = 3;
	};
	btn2.onmouseover = function(){
	speed = -3;
	};

	ul.onmouseover = function(e) {
	clearInterval(time);
	e = e \|\| window.event;
	var source = e.target \|\| e.srcElement;
	var sourceTagName = source.tagName;

	console.log("source:", source.tagName);

	if (sourceTagName.toLowerCase() == "img") {
	activeImg = source;
	activeImg.className = "active";
	}

	if (e.stopPropagation) {
	e.stopPropagation();
	} else {
	e.cancelBubble = true;
	}
	return false;
	};

	ul.onmouseout = function() {
	time = setInterval(moveFunction,30);
	if (activeImg) {
	activeImg.className = "none";
	activeImg = null;
	}
	};
	}
	</script>
	</head>
	<body>
	<div class="direction"><img src="/jscss/demoimg/201204/left.png" alt="" id="button1"/><img src="/jscss/demoimg/201204/right.png" alt="" id="button2"/></div>
	<div id="wrap">
	<ul>
	<li><img src="http://www.codefans.net/jscss/demoimg/wall1.jpg" alt="pic one" /></li>
	<li><img src="http://www.codefans.net/jscss/demoimg/wall2.jpg" alt="pic two" /></li>
	<li><img src="http://www.codefans.net/jscss/demoimg/wall3.jpg" alt="pic three" /></li>
	<li><img src="http://www.codefans.net/jscss/demoimg/wall4.jpg" alt="pic four" /></li>
	</ul>
	</div>
	</body>
	</html>