Go7hic/js自动轮播效果

## js自动轮播效果
<!doctype html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>js图片轮播</title>
	<style>
	body,div,ul,li{margin:0;padding:0;}
ul{list-style-type:none;}
body{background:#000;text-align:center;font:12px/20px Arial;}
#box{position:relative;width:492px;height:172px;background:#fff;border-radius:5px;border:8px solid #fff;margin:10px auto;cursor:pointer;}
#box .list{position:relative;width:490px;height:170px;overflow:hidden;}
#box .list ul{position:absolute;top:0;left:0;}
#box .list li{width:490px;height:170px;overflow:hidden;}
#box .count{position:absolute;right:0;bottom:5px;}
#box .count li{color:#fff;float:left;width:20px;height:20px;cursor:pointer;margin-right:5px;overflow:hidden;background:#F90;opacity:0.7;filter:alpha(opacity=70);border-radius:20px;}
#box .count li.current{color:#fff;opacity:1;filter:alpha(opacity=100);font-weight:700;background:#f60;}
#tmp{width:100px;height:100px;background:red;position:absolute;}

	</style>
	<script>
window.onload = function () {
	var oBox = document.getElementById("box");
	var oList = oBox.getElementsByTagName("ul")[0];
	var aImg = oBox.getElementsByTagName("img");
	var timer = playTimer = null;
	var index = i = 0;
	var bOrder = true;
	var aTmp = [];
	var aBtn = null;

	//生成数字按钮
	for (i = 0; i < aImg.length; i++) aTmp.push("<li>" + (i + 1) + "</li>");

	//插入元素
	var oCount = document.createElement("ul");
	oCount.className = "count";
	oCount.innerHTML = aTmp.join("");
	oBox.appendChild(oCount);
	aBtn = oBox.getElementsByTagName("ul")[1].getElementsByTagName("li");

	//初始化状态
	cutover();

	//按钮点击切换
	for (i = 0; i < aBtn.length; i++) {
		aBtn[i].index = i;
		aBtn[i].onmouseover = function ()
		{
			index = this.index;
			cutover()
		}
	}

	function cutover() {
		for (i = 0; i < aBtn.length; i++) aBtn[i].className = "";
		aBtn[index].className = "current";
		startMove(-(index * aImg[0].offsetHeight))
	}

	function next() {
		bOrder ? index++ : index--;
		index <= 0 && (index = 0, bOrder = true);
		index >= aBtn.length - 1 && (index = aBtn.length - 1, bOrder = false)
		cutover()
	}

	playTimer = setInterval(next, 3000);

	//鼠标移入展示区停止自动播放
	oBox.onmouseover = function () {
		clearInterval(playTimer)
	};

	//鼠标离开展示区开始自动播放
	oBox.onmouseout = function () {
		playTimer = setInterval(next, 3000)
	};
	function startMove(iTarget) {
		clearInterval(timer);
		timer = setInterval(function ()
		{
			doMove(iTarget)
		}, 30)
	}
	function doMove (iTarget) {
		var iSpeed = (iTarget - oList.offsetTop) / 10;
		iSpeed = iSpeed > 0 ? Math.ceil(iSpeed) : Math.floor(iSpeed);
		oList.offsetTop == iTarget ? clearInterval(timer) : oList.style.top = oList.offsetTop + iSpeed + "px"
	}
};
</script>
</head>
<body>
<div id="box">
	<div class="list">
		<ul>
			<li><img src="" alt="" width="490" height="170"></li>
			<li><img src="" alt="" width="490" height="170"></li>
			<li><img src="" alt="" width="490" height="170"></li>
			<li><img src="" alt="" width="490" height="170"></li>
			<li><img src="" alt="" width="490" height="170"></li>
		</ul>
	</div>
</div>


</body>
</html>
	<!doctype html>
	<html lang="en">
	<head>
	<meta charset="UTF-8">
	<title>js图片轮播</title>
	<style>
	body,div,ul,li{margin:0;padding:0;}
	ul{list-style-type:none;}
	body{background:#000;text-align:center;font:12px/20px Arial;}
	#box{position:relative;width:492px;height:172px;background:#fff;border-radius:5px;border:8px solid #fff;margin:10px auto;cursor:pointer;}
	#box .list{position:relative;width:490px;height:170px;overflow:hidden;}
	#box .list ul{position:absolute;top:0;left:0;}
	#box .list li{width:490px;height:170px;overflow:hidden;}
	#box .count{position:absolute;right:0;bottom:5px;}
	#box .count li{color:#fff;float:left;width:20px;height:20px;cursor:pointer;margin-right:5px;overflow:hidden;background:#F90;opacity:0.7;filter:alpha(opacity=70);border-radius:20px;}
	#box .count li.current{color:#fff;opacity:1;filter:alpha(opacity=100);font-weight:700;background:#f60;}
	#tmp{width:100px;height:100px;background:red;position:absolute;}

	</style>
	<script>
	window.onload = function () {
	var oBox = document.getElementById("box");
	var oList = oBox.getElementsByTagName("ul")[0];
	var aImg = oBox.getElementsByTagName("img");
	var timer = playTimer = null;
	var index = i = 0;
	var bOrder = true;
	var aTmp = [];
	var aBtn = null;

	//生成数字按钮
	for (i = 0; i < aImg.length; i++) aTmp.push("<li>" + (i + 1) + "</li>");

	//插入元素
	var oCount = document.createElement("ul");
	oCount.className = "count";
	oCount.innerHTML = aTmp.join("");
	oBox.appendChild(oCount);
	aBtn = oBox.getElementsByTagName("ul")[1].getElementsByTagName("li");

	//初始化状态
	cutover();

	//按钮点击切换
	for (i = 0; i < aBtn.length; i++) {
	aBtn[i].index = i;
	aBtn[i].onmouseover = function ()
	{
	index = this.index;
	cutover()
	}
	}

	function cutover() {
	for (i = 0; i < aBtn.length; i++) aBtn[i].className = "";
	aBtn[index].className = "current";
	startMove(-(index * aImg[0].offsetHeight))
	}

	function next() {
	bOrder ? index++ : index--;
	index <= 0 && (index = 0, bOrder = true);
	index >= aBtn.length - 1 && (index = aBtn.length - 1, bOrder = false)
	cutover()
	}

	playTimer = setInterval(next, 3000);

	//鼠标移入展示区停止自动播放
	oBox.onmouseover = function () {
	clearInterval(playTimer)
	};

	//鼠标离开展示区开始自动播放
	oBox.onmouseout = function () {
	playTimer = setInterval(next, 3000)
	};
	function startMove(iTarget) {
	clearInterval(timer);
	timer = setInterval(function ()
	{
	doMove(iTarget)
	}, 30)
	}
	function doMove (iTarget) {
	var iSpeed = (iTarget - oList.offsetTop) / 10;
	iSpeed = iSpeed > 0 ? Math.ceil(iSpeed) : Math.floor(iSpeed);
	oList.offsetTop == iTarget ? clearInterval(timer) : oList.style.top = oList.offsetTop + iSpeed + "px"
	}
	};
	</script>
	</head>
	<body>
	<div id="box">
	<div class="list">
	<ul>
	<li><img src="" alt="" width="490" height="170"></li>
	<li><img src="" alt="" width="490" height="170"></li>
	<li><img src="" alt="" width="490" height="170"></li>
	<li><img src="" alt="" width="490" height="170"></li>
	<li><img src="" alt="" width="490" height="170"></li>
	</ul>
	</div>
	</div>


	</body>
	</html>