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效果图

《javaScript100例|04》自动播放——Js幻灯片缓冲效果效果图_javascript

 

示例


<html>
<head>
<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;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 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 = [];

//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);

//初始化状态
var aBtn = oBox.getElementsByTagName("ul")[1].getElementsByTagName("li");
aBtn[index].className = "current";

//按钮点击切换
for (i = 0; i < aBtn.length; i++)
    {
aBtn[i].index = i;
aBtn[i].onclick = function ()
        {
index = this.index;
for (i = 0; i < aBtn.length; i++) aBtn[i].className = "";
this.className = "current";         
startMove(-(this.index * aImg[0].offsetHeight))     
        }
    }

//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 ()
    {
autoPlay()
    };

//页面加载即调用自动播放
oBox.onmouseout();

//自动播放函数
function autoPlay()
    {
playTimer = setInterval(function ()
        {
bOrder ? index++ : index--;         
index == aBtn.length - 1 && (bOrder = false);
index == 0 && (bOrder = true);
aBtn[index].onclick();
startMove(-(index * aImg[0].offsetHeight))
        }, 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="wall5.jpg" width="490" height="170" /></li>
<li><img src="wall6.jpg" width="490" height="170" /></li>
<li><img src="wall7.jpg" width="490" height="170" /></li>
</ul>
</div>
</div>
</body>
</html>

 

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