js 自动播放幻灯片缓冲效果代码

作者：简简单单 2013-09-04

提示：您可以先修改部分代码再运行

<!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=utf-8" />
<title>自动播放幻灯片缓冲效果</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;background:#fff;border-radius:5px;border:8px solid #fff;margin:10px auto;cursor:pointer;}
#box .list{position:relative;overflow:hidden;}
#box .list ul{position:absolute;top:0;left:0;}
#box .list li{overflow:hidden;}
#box .count{position:absolute;right:0;bottom:5px;}
#box .count li{color:#fff;float:left;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{background:red;position:absolute;}
</style>
<script type="text/javascript">
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><a href="img/01.jpg" class="js-smartPhoto" target="_blank"><img  src="img/01.jpg"   /></a></li>
            <li><a href="img/02.jpg" class="js-smartPhoto" target="_blank"><img  src="img/02.jpg"   /></a></li>
            <li><a href="img/03.jpg" class="js-smartPhoto" target="_blank"><img  src="img/03.jpg"   /></a></li>
            <li><a href="img/04.jpg" class="js-smartPhoto" target="_blank"><img  src="img/04.jpg"   /></a></li>
            <li><a href="img/05.jpg" class="js-smartPhoto" target="_blank"><img  src="img/05.jpg"   /></a></li>
        </ul>
    </div>
</div>
</body>
</html></td>
	  </tr>
	</table>

提示：您可以先修改部分代码再运行

js 自动播放幻灯片缓冲效果代码

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