现仅已.NET为例，HTML代码如下
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>test</title>
<meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
<meta name="CODE_LANGUAGE" Content="C#">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
<script language="JavaScript">
<!--
var smallX = 200; //缩略图宽度
var bigX = 600; //预览窗大小,可以任意设置
var bigY = 450;
var srcX = -1; //原图大小,可以任意设置. 如都为-1将使用图片原始大小
var srcY = -1;
var border = 5; //边框
var smallY,viewX,viewY,bl,isIE,vX,vY;
window.onload=function (){
head.innerHTML="图片已载入";
isIE=window.event?1:0;
if (srcX==-1 && srcY==-1){srcX=document.getElementByIdx('bigpic').width;srcY=document.getElementByIdx('bigpic').height;}
else{document.getElementByIdx('bigpic').width=srcX;document.getElementByIdx('bigpic').height=srcY;}
smallY=srcY*smallX/srcX;
viewX=bigX/srcX*smallX; //预览范围
viewY=bigY/srcY*smallY;
bl=srcX/smallX; //缩小比例
document.getElementByIdx('smallpic').width=smallX;
document.getElementByIdx('smallpic').height=smallY;
smallbox.style.borderWidth=border;
smallbox.style.width=document.getElementByIdx('smallpic').offsetWidth+border*2*isIE;
smallbox.style.height=document.getElementByIdx('smallpic').offsetHeight+border*2*isIE;
bigbox.style.borderWidth=border;
bigbox.style.width=bigX+border*2*isIE;
bigbox.style.height=bigY+border*2*isIE;
view.style.left=smallbox.offsetLeft + border;
view.style.top=smallbox.offsetTop + border;
view.style.width=viewX- !isIE*3+1;
view.style.height=viewY- !isIE*3+1;
}
function move(e){
var e = window.event?window.event:e;
if (!isIE){vX=e.pageX-border-smallbox.offsetLeft;
vY=e.pageY-border-smallbox.offsetTop}
else{vX=e.offsetX;vY=e.offsetY}
vX+=-viewX/2;
vY+=-viewY/2;
if (vX < 0) vX = 0;
if (vY < 0) vY = 0;
if (vX > smallX - viewX) vX = smallX - viewX;
if (vY > smallY - viewY) vY = smallY - viewY;
bigpico.style.marginLeft = - vX * bl;
bigpico.style.marginTop = - vY * bl;
view.style.left = vX + smallbox.offsetLeft + border;
view.style.top = vY + smallbox.offsetTop + border;
}
//-->
</script>
<style type="text/css">
<!--
*{padding:0;margin:0}
body{background:black}
img{display:block;}
#smallbox{border:1px #c33 solid;float:left;width:0;height:0;overflow:hidden;font-size:0px}
#bigbox{border:1px #c33 solid;width:0px;height:0px;float:left;overflow:hidden;font-size:0px}
#view{border:1px #ddd solid;width:0px;height:0px;position:absolute;font-size:0px}
#head{text-align:center;line-height:40px;font:bold 16px/40px;color:pink}
//-->
</style>
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<div id="head">图片loading...</div>
<div id="smallbox"><img id="smallpic" src="Upimages/ShopImages/<%=simage%>" border="0" onmousemove="move(event)"></div>
<div id="bigbox"><div id="bigpico"><img id="bigpic" src="Upimages/ShopImages/<%=zimage%>" border="0"></div></div>
<div id="view" onmousemove="if (!isIE) move(event)"></div>
</form>
</body>
</HTML>
其中的<%=simage%>,<%=zimage%>都是程序调用的。预览效果如下：
