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fgm71.html
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<!Doctype html>
<head>
<meta 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;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" src='js/jquery-3.1.1.min.js'></script>
<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>
<script type="text/javascript">
$().function(){
}
</script>
</head>
<body>
<div id="box">
<div class="list">
<ul>
<li><img src="img/img1.png" width="490" height="170" /></li>
<li><img src="img/img2.png" width="490" height="170" /></li>
<li><img src="img/img3.png" width="490" height="170" /></li>
<li><img src="img/img4.png" width="490" height="170" /></li>
<li><img src="img/img4.png" width="490" height="170" /></li>
</ul>
</div>
</div>
</body>
</html>