原生javascript图片自动或手动切换示例附演示源码

一、效果图
 
二、html代码

<style type="text/css"> 
.container, .container *{margin:0; padding:0;} .container{width:408px; height:168px; overflow:hidden;position:relative;} 
.slider{position:absolute;} 
.slider li{ list-style:none;display:inline;} 
.slider img{ width:408px; height:168px; display:block;} 
.slider2{width:2000px;} 
.slider2 li{float:left;} 
.num{ position:absolute; right:5px; bottom:5px;} 
.num li{ 
float: left; 
color: #FF7300; 
text-align: center; 
line-height: 16px; 
width: 16px; 
height: 16px; 
font-family: Arial; 
font-size: 12px; 
cursor: pointer; 
overflow: hidden; 
margin: 3px 1px; 
border: 1px solid #FF7300; 
background-color: #fff; 
} 
.num li.on{ 
color: #fff; 
line-height: 21px; 
width: 21px; 
height: 21px; 
font-size: 16px; 
margin: 0 1px; 
border: 0; 
background-color: #FF7300; 
font-weight: bold; 
} 
</style> 
<div class="container" id="idTransformView2"> 
<ul class="slider slider2" id="idSlider2"> 
<li><img src="images/01.jpg"/></li> 
<li><img src="images/02.jpg"/></li> 
<li><img src="images/03.jpg"/></li> 
</ul> 
<ul class="num" id="idNum2"> 
<li>1</li> 
<li>2</li> 
<li>3</li> 
</ul> 
</div>

三、源代码

var $ = 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 = $(container), oSlider = $(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 objs = $("idNum2").getElementsByTagName("li"); 
var tv = new TransformView("idTransformView2", "idSlider2", 408, 3, { 
onStart: function(){ Each(objs, function(o, i){ o.className = tv.Index == i ? "on" : ""; }) },//按钮样式 
Up: false 
}); 
tv.Start(); 
Each(objs, function(o, i){ 
o.onmouseover = function(){ 
o.className = "on"; 
tv.Auto = false; 
tv.Index = i; 
tv.Start(); 
} 
o.onmouseout = function(){ 
o.className = ""; 
tv.Auto = true; 
tv.Start(); 
} 
}) 
}

一看就名目了然了，所以就不细讲解代码！
演示及源文件下载