效果预览：
HTML代码：
Code<!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=gb2312" />
<title>图片特效</title>
<style type="text/css">
.lightbox{width:300px;background:#FFFFFF;border:1px solid #ccc;line-height:25px; top:5%; left:5%;}
.lightbox dt{background:#f4f4f4;}
</style>
<script src="JPImage.js" type="text/javascript">
</script>
</head>
<body>
<table id="idBox" class="lightbox">
<tr id="idBoxHead" style="text-align:right">
<td>
<span style="font-size:12px">鼠标滚轮放大图片</span>
<a href="2.jpg" target="_blank"><img src="newwindow.gif" onclick="" alt="" width="16" height="16" border="0"/></a>
<img src="resize.gif" onclick="ResizeImage()" alt="" width="16" height="16" />
<img src="close.gif" id="idBoxCancel" alt="close" width="11" height="11"/>
</td>
</tr>
<tr style="text-align:left">
<td><img src="2.jpg" height="500" onmousewheel="return ZoomImg(this)" style="800px" id="imgclose" alt="" /></td>
</tr>
</table>
<div>
<br />
<img src="2.jpg" alt="" id="iimg" width="120" height="100"/>
</div>
<script language="javascript" type="text/javascript">
var box = new LightBox("idBox");
$("idBoxCancel").onclick = function(){ box.Close(); }
$("imgclose").onclick = function(){ box.Close(); }
$("iimg").onclick = function(){ box.Show(); }
</script>
</body>
</html>
JS文件代码：
Codevar isIE = (document.all) ? true : false;
var isIE6 = isIE && ([/MSIE (\d)\.0/i.exec(navigator.userAgent)][0][1] == 6);
var $ = function (id)
{
return "string" == typeof id ? document.getElementById(id) : id;
};
var Class =
{
create: function()
{
return function() { this.initialize.apply(this, arguments); }
}
};
var Extend = function(destination, source)
{
for (var property in source)
{
destination[property] = source[property];
}
};
var Bind = function(object, fun)
{
return function()
{
return fun.apply(object, arguments);
}
};
var Each = function(list, fun)
{
for (var i = 0, len = list.length; i < len; i++) { fun(list[i], i); }
};
var Contains = function(a, b)
{
return a.contains ? a != b && a.contains(b) : !!(a.compareDocumentPosition(b) & 16);
};
var OverLay = Class.create();
OverLay.prototype =
{
initialize: function(options)
{
this.SetOptions(options);
this.Lay = $(this.options.Lay) || document.body.insertBefore(document.createElement("div"), document.body.childNodes[0]);
this.Color = this.options.Color;
this.Opacity = parseInt(this.options.Opacity);
this.zIndex = parseInt(this.options.zIndex);
with(this.Lay.style){ display = "none"; zIndex = this.zIndex; left = top = 0; position = "fixed"; width = height = "100%"; }
if(isIE6){
this.Lay.style.position = "absolute";
//ie6设置覆盖层大小程序
this._resize = Bind(this, function(){
this.Lay.style.width = Math.max(document.documentElement.scrollWidth, document.documentElement.clientWidth) + "px";
this.Lay.style.height = Math.max(document.documentElement.scrollHeight, document.documentElement.clientHeight) + "px";
});
//遮盖select
this.Lay.innerHTML = '<iframe style="position:absolute;top:0;left:0;100%;height:100%;filter:alpha(opacity=0);"></iframe>'
}
},
//设置默认属性
SetOptions: function(options)
{
this.options =
{//默认值
Lay: null,//覆盖层对象
Color: "#000",//背景色
Opacity: 50,//透明度(0-100)
zIndex: 1000//层叠顺序
};
Extend(this.options, options || {});
},
//显示
Show: function()
{
//兼容ie6
if(isIE6){ this._resize(); window.attachEvent("onresize", this._resize); }
//设置样式
with(this.Lay.style)
{
//设置透明度
isIE ? filter = "alpha(opacity:" + this.Opacity + ")" : opacity = this.Opacity / 100;
backgroundColor = this.Color; display = "block";
}
},
//关闭
Close: function()
{
this.Lay.style.display = "none";
if(isIE6){ window.detachEvent("onresize", this._resize); }
}
};
var LightBox = Class.create();
LightBox.prototype =
{
initialize: function(box, options)
{
this.Box = $(box);//显示层
this.OverLay = new OverLay(options);//覆盖层
this.SetOptions(options);
this.Fixed = !!this.options.Fixed;
this.Over = !!this.options.Over;
this.Center = !!this.options.Center;
this.onShow = this.options.onShow;
this.Box.style.zIndex = this.OverLay.zIndex + 1;
this.Box.style.display = "none";
//兼容ie6用的属性
if(isIE6)
{
this._top = this._left = 0; this._select = [];
this._fixed = Bind(this, function(){ this.Center ? this.SetCenter() : this.SetFixed(); });
}
},
//设置默认属性
SetOptions: function(options)
{
this.options =
{//默认值
Over: true,//是否显示覆盖层
Fixed: false,//是否固定定位
Center: false,//是否居中
onShow: function(){}//显示时执行
};
Extend(this.options, options || {});
},
//兼容ie6的固定定位程序
SetFixed: function()
{
this.Box.style.top = document.documentElement.scrollTop - this._top + this.Box.offsetTop + "px";
this.Box.style.left = document.documentElement.scrollLeft - this._left + this.Box.offsetLeft + "px";
this._top = document.documentElement.scrollTop; this._left = document.documentElement.scrollLeft;
},
//兼容ie6的居中定位程序
SetCenter: function()
{
this.Box.style.marginTop = document.documentElement.scrollTop - this.Box.offsetHeight / 2 + "px";
this.Box.style.marginLeft = document.documentElement.scrollLeft - this.Box.offsetWidth / 2 + "px";
},
//显示
Show: function(options)
{
//固定定位
this.Box.style.position = this.Fixed && !isIE6 ? "fixed" : "absolute";
//覆盖层
this.Over && this.OverLay.Show();
this.Box.style.display = "block";
//居中
if(this.Center)
{
this.Box.style.top = this.Box.style.left = "50%";
//设置margin
if(this.Fixed)
{
this.Box.style.marginTop = - this.Box.offsetHeight / 2 + "px";
this.Box.style.marginLeft = - this.Box.offsetWidth / 2 + "px";
}else{
this.SetCenter();
}
}
//兼容ie6
if(isIE6)
{
if(!this.Over)
{
//没有覆盖层ie6需要把不在Box上的select隐藏
this._select.length = 0;
Each(document.getElementsByTagName("select"), Bind(this, function(o){
if(!Contains(this.Box, o)){ o.style.visibility = "hidden"; this._select.push(o); }
}))
}
//设置显示位置
this.Center ? this.SetCenter() : this.Fixed && this.SetFixed();
//设置定位
this.Fixed && window.attachEvent("onscroll", this._fixed);
}
this.onShow();
},
//关闭
Close: function()
{
this.Box.style.display = "none";
this.OverLay.Close();
if(isIE6)
{
window.detachEvent("onscroll", this._fixed);
Each(this._select, function(o){ o.style.visibility = "visible"; });
}
}
};
function ZoomImg(o)
{
var zoom = parseInt(o.style.zoom, 10) || 100;
zoom += event.wheelDelta / 12;
if(zoom >60&&zoom<120)
o.style.zoom = zoom + '%';
return false;
}
function ResizeImage()
{
var img=document.getElementById("imgclose");
var a=img.width;
var b=img.height;
//移除img的width,这样就得到原始的长了,不过图片也放大了,上面的代码不会,只是使用Image对象来获取原始的长
img.removeAttribute("width");
img.removeAttribute("height");
var w=img.width;
var h=img.height;
document.getElementById("").style.width=w;
document.getElementById("").style.height=h;
alert(w+" "+h);
}