分享一款实用的js图片切换代码，区域内几张图片自动轮播切换显示，能自定义切换速度和图片数量。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<title>js图片自动轮播切换代码_武鸣人</title>
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<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_www_wuming_ren{position:relative;width:492px;height:172px;background:#fff;border-radius:5px;border:8px solid #fff;margin:10px auto;cursor:pointer;}
#box_www_wuming_ren .list{position:relative;width:490px;height:170px;overflow:hidden;}
#box_www_wuming_ren .list ul{position:absolute;top:0;left:0;}
#box_www_wuming_ren .list li{width:490px;height:170px;overflow:hidden;}
#box_www_wuming_ren .count{position:absolute;right:0;bottom:5px;}
#box_www_wuming_ren .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_www_wuming_ren .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">
//获取ID
var $ = function (id) {return typeof id === "string" ? document.getElementById(id) : id};
//获取tagName
var $$ = function (tagName, oParent) {return (oParent || document).getElementsByTagName(tagName)};
//自动播放对象
var AutoPlay = function (id) {this.initialize(id)};
AutoPlay.prototype = {
initialize: function (id)
{
var oThis = this;
this.oBox = $(id);
this.oUl = $$("ul", this.oBox)[0];
this.aImg = $$("img", this.oBox);
this.timer = null;
this.autoTimer = null;
this.iNow = 0;
this.creatBtn();
this.aBtn = $$("li", this.oCount);
this.toggle();
this.autoTimer = setInterval(function ()
{
oThis.next()
}, 3000);
this.oBox.onmouseover = function ()
{
clearInterval(oThis.autoTimer)
};
this.oBox.onmouseout = function ()
{
oThis.autoTimer = setInterval(function ()
{
oThis.next()
}, 3000)
};
for (var i = 0; i < this.aBtn.length; i++)
{
this.aBtn[i].index = i;
this.aBtn[i].onmouseover = function ()
{
oThis.iNow = this.index;
oThis.toggle()
}
}
},
creatBtn: function ()
{
this.oCount = document.createElement("ul");
this.oFrag = document.createDocumentFragment();
this.oCount.className = "count";
for (var i = 0; i < this.aImg.length; i++)
{
var oLi = document.createElement("li");
oLi.innerHTML = i + 1;
this.oFrag.appendChild(oLi)
}
this.oCount.appendChild(this.oFrag);
this.oBox.appendChild(this.oCount)
},
toggle: function ()
{
for (var i = 0; i < this.aBtn.length; i++) this.aBtn[i].className = "";
this.aBtn[this.iNow].className = "current";
this.doMove(-(this.iNow * this.aImg[0].offsetHeight))
},
next: function ()
{
this.iNow++;
this.iNow == this.aBtn.length && (this.iNow = 0);
this.toggle()
},
doMove: function (iTarget)
{
var oThis = this;
clearInterval(oThis.timer);
oThis.timer = setInterval(function ()
{
var iSpeed = (iTarget - oThis.oUl.offsetTop) / 5;
iSpeed = iSpeed > 0 ? Math.ceil(iSpeed) : Math.floor(iSpeed);
oThis.oUl.offsetTop == iTarget ? clearInterval(oThis.timer) : (oThis.oUl.style.top = oThis.oUl.offsetTop + iSpeed + "px")
}, 30)
}
};
window.onload = function ()
{
new AutoPlay("box_www_wuming_ren");
};
</script>
</head>
<body>
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<script type="text/javascript" src="https://www.wuming.ren/ad/a.js"></script>
<div id="box_www_wuming_ren">
<div class="list">
<ul>
<li><img src="/img/20240221_www_wuming_ren_25.jpg" width="490" height="170" /></li>
<li><img src="/img/20240221_www_wuming_ren_26.jpg" width="490" height="170" /></li>
<li><img src="/img/20240221_www_wuming_ren_27.jpg" width="490" height="170" /></li>
<li><img src="/img/20240221_www_wuming_ren_28.jpg" width="490" height="170" /></li>
<li><img src="/img/20240221_www_wuming_ren_29.jpg" width="490" height="170" /></li>
</ul>
</div>
</div>
</body>
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