js透明按钮图片滑动切换焦点图滚动特效代码

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以下是 js透明按钮图片滑动切换焦点图滚动特效代码的示例演示效果:
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平台:
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部分效果截图:
HTML代码(index.html):
<!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>js透明按钮图片滑动切换焦点图</title>
<style type="text/css">
body, ul, dl, dd, dt, ol, li, p, h1, h2, h3, h4, h5, h6, textarea, form, select, fieldset, table, td, div, input {margin:0;padding:0;-webkit-text-size-adjust: none; font-size:12px}
h1, h2, h3, h4, h5, h6{font-size:12px;font-weight:normal;}
li { list-style-type:none }
.column1_left { width:321px; margin:0 auto; text-align:center; border:1px solid #CCC; padding:2px }
.container { width:321px; height:306px; overflow:hidden; position:relative; background:#000 }
.slider li { list-style:none; display:inline; }
.slider img { width:321px; height:279px; display:block; border:0; }
.slider2 li { float:left; position:relative }
.num { position:absolute; right:100px; bottom:4px; height:20px; _bottom:1px; }
.num li { float: left; width:21px; height:20px; background:url(images/ink0721hui.png) no-repeat center center; _background:none; _filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='images/ink0721hui.png', sizingMethod='crop');
cursor: pointer; overflow: hidden; }
.num li.on { background:url(images/ink0721hui1.png) no-repeat center center; _background:none; _filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='images/ink0721hui1.png', sizingMethod='crop');
width:21px; height:20px; }
.idSiideer_pos{height:27px; line-height:27px; color:#FFF;position:absolute; left:0px; bottom:0px; width:321px; z-index:10; text-align:center;}
.idSiideer_pos2{height:27px; background:#000; position:absolute; left:0px; bottom:0px; width:321px;filter:alpha(opacity=50);opacity:0.5;}
</style>
</head>
<body>
<div style="background:#FFF; padding:50px;">
<!--效果开始-->
<div class="column1_left">
  <div class="container" id="idTransformView2">
    <ul class="slider slider2" id="idSlider2">
      <li><a href=""><img src="images/0721js001.jpg"/></a>
      <div class="idSiideer_pos">女星露背大比拼 谁是你心中的“美背女神”</div>
      <div class="idSiideer_pos2"></div>
      </li>
      <li><a href=""><img src="images/0721js002.jpg"/></a>
      <div class="idSiideer_pos">如此惊艳的造型，让人不禁感叹</div>
      <div class="idSiideer_pos2"></div>
      </li>
      <li><a href=""><img src="images/0721js003.jpg"/></a>
      <div class="idSiideer_pos">林志玲身穿前短后长的银色亮片裙亮相</div>
      <div class="idSiideer_pos2"></div>
      </li>
      <li><a href=""><img src="images/0721js004.jpg"/></a>
      <div class="idSiideer_pos">女星露背大比拼 谁是你心中的“美背女神”</div>
      <div class="idSiideer_pos2"></div>
      </li>
      <li><a href=""><img src="images/0721js005.jpg"/></a>
      <div class="idSiideer_pos">如此惊艳的造型，让人不禁感叹</div>
      <div class="idSiideer_pos2"></div>
      </li>
      <li><a href=""><img src="images/0721js006.jpg"/></a>
      <div class="idSiideer_pos">林志玲身穿前短后长的银色亮片裙亮相</div>
      <div class="idSiideer_pos2"></div>
      </li>
    </ul>
    <ul class="num" id="idNum2">
      <li></li>
      <li></li>
      <li></li>
      <li></li>
      <li></li>
      <li></li>
    </ul>
   </div>
</div>
<script type="text/javascript">
//计算idslider2的宽度开始
var kuan1=0;
var kuand=document.getElementById('idSlider2')
var kuan=document.getElementById('idSlider2').getElementsByTagName("li");
var tpz=kuan.length;//图片总个数
for(var i=0; i<kuan.length; i++){
	kuan1+=321;
	}
kuand.style.width=kuan1+'px';
//计算结束

var keVar = function (id) {
	return "string" == typeof id ? document.getElementById(id) : id;
};

var Class = {
  create: function() {
	return function() {
	  this.initialize.apply(this, arguments);
	}
  }
}

Object.extend = function(destination, source) {
	for (var property in source) {
		destination[property] = source[property];
	}
	return destination;
}

var TransformView = Class.create();
TransformView.prototype = {
  //容器对象,滑动对象,切换参数,切换数量
  initialize: function(container, slider, parameter, count, options) {
	if(parameter <= 0 || count <= 0) return;
	var oContainer = keVar(container), oSlider = keVar(slider), oThis = this;

	this.Index = 0;//当前索引
	
	this._timer = null;//定时器
	this._slider = oSlider;//滑动对象
	this._parameter = parameter;//切换参数
	this._count = count || 0;//切换数量
	this._target = 0;//目标参数
	
	this.SetOptions(options);
	
	this.Up = !!this.options.Up;
	this.Step = Math.abs(this.options.Step);
	this.Time = Math.abs(this.options.Time);
	this.Auto = !!this.options.Auto;
	this.Pause = Math.abs(this.options.Pause);
	this.onStart = this.options.onStart;
	this.onFinish = this.options.onFinish;
	
	oContainer.style.overflow = "hidden";
	oContainer.style.position = "relative";
	
	oSlider.style.position = "absolute";
	oSlider.style.top = oSlider.style.left = 0;
  },
  //设置默认属性
  SetOptions: function(options) {
	this.options = {//默认值
		Up:			true,//是否向上(否则向左)
		Step:		5,//滑动变化率
		Time:		10,//滑动延时
		Auto:		true,//是否自动转换
		Pause:		2000,//停顿时间(Auto为true时有效)
		onStart:	function(){},//开始转换时执行
		onFinish:	function(){}//完成转换时执行
	};
	Object.extend(this.options, options || {});
  },
  //开始切换设置
  Start: function() {
	if(this.Index < 0){
		this.Index = this._count - 1;
	} else if (this.Index >= this._count){ this.Index = 0; }
	
	this._target = -1 * this._parameter * this.Index;
	this.onStart();
	this.Move();
  },
  //移动
  Move: function() {
	clearTimeout(this._timer);
	var oThis = this, style = this.Up ? "top" : "left", iNow = parseInt(this._slider.style[style]) || 0, iStep = this.GetStep(this._target, iNow);
	
	if (iStep != 0) {
		this._slider.style[style] = (iNow + iStep) + "px";
		this._timer = setTimeout(function(){ oThis.Move(); }, this.Time);
	} else {
		this._slider.style[style] = this._target + "px";
		this.onFinish();
		if (this.Auto) { this._timer = setTimeout(function(){ oThis.Index++; oThis.Start(); }, this.Pause); }
	}
  },
  //获取步长
  GetStep: function(iTarget, iNow) {
	var iStep = (iTarget - iNow) / this.Step;
	if (iStep == 0) return 0;
	if (Math.abs(iStep) < 1) return (iStep > 0 ? 1 : -1);
	return iStep;
  },
  //停止
  Stop: function(iTarget, iNow) {
	clearTimeout(this._timer);
	this._slider.style[this.Up ? "top" : "left"] = this._target + "px";
  }
};

window.onload=function(){
	function Each(list, fun){
		for (var i = 0, len = list.length; i < len; i++) { fun(list[i], i); }
	};
	
	var objs2 = keVar("idNum2").getElementsByTagName("li");
	var tv2 = new TransformView("idTransformView2", "idSlider2", 321, tpz, {	
		onStart: function(){ Each(objs2, function(o, i){ o.className = tv2.Index == i ? "on" : ""; }) },//按钮样式
		Up: false
	});//6是轮播总数
	tv2.Start();
	Each(objs2, function(o, i){
		o.onmouseover = function(){
			o.className = "on";
			tv2.Auto = false;
			tv2.Index = i;
			tv2.Start();
		}
		o.onmouseout = function(){
			o.className = "";
			tv2.Auto = true;
			tv2.Start();
		}
	})
}
</script>
<!--End-->
</div>
</body>
</html>
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