js图片放大镜可动态更换图片

现仅已.NET为例，HTML代码如下
 1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
 2 <HTML>
 3  <HEAD>
 4   <title>test</title>
 5   <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
 6   <meta name="CODE_LANGUAGE" Content="C#">
 7   <meta name="vs_defaultClientScript" content="JavaScript">
 8   <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
 9   <script language="JavaScript">
10 <!--
11 var smallX = 200; //缩略图宽度
12 var bigX = 600; //预览窗大小,可以任意设置
13 var bigY = 450;
14 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
15 var srcY = -1;
16 var border = 5; //边框
17 var smallY,viewX,viewY,bl,isIE,vX,vY;
18 window.onload=function (){
19  head.innerHTML="图片已载入";
20  isIE=window.event?1:0;
21  if (srcX==-1 && srcY==-1){srcX=document.getElementByIdx('bigpic').width;srcY=document.getElementByIdx('bigpic').height;}
22  else{document.getElementByIdx('bigpic').width=srcX;document.getElementByIdx('bigpic').height=srcY;}
23  smallY=srcY*smallX/srcX;
24  viewX=bigX/srcX*smallX; //预览范围
25  viewY=bigY/srcY*smallY;
26  bl=srcX/smallX; //缩小比例
27  document.getElementByIdx('smallpic').width=smallX;
28  document.getElementByIdx('smallpic').height=smallY;
29  smallbox.style.borderWidth=border;
30  smallbox.style.width=document.getElementByIdx('smallpic').offsetWidth+border*2*isIE;
31  smallbox.style.height=document.getElementByIdx('smallpic').offsetHeight+border*2*isIE;
32  bigbox.style.borderWidth=border;
33  bigbox.style.width=bigX+border*2*isIE;
34  bigbox.style.height=bigY+border*2*isIE;
35  view.style.left=smallbox.offsetLeft + border;
36  view.style.top=smallbox.offsetTop + border;
37  view.style.width=viewX- !isIE*3+1;
38  view.style.height=viewY- !isIE*3+1;
39 }
40 function move(e){
41  var e = window.event?window.event:e;
42  if (!isIE){vX=e.pageX-border-smallbox.offsetLeft;
43  vY=e.pageY-border-smallbox.offsetTop}
44  else{vX=e.offsetX;vY=e.offsetY}
45  vX+=-viewX/2;
46  vY+=-viewY/2;
47  if (vX < 0) vX = 0;
48  if (vY < 0) vY = 0;
49  if (vX > smallX - viewX) vX = smallX - viewX;
50  if (vY > smallY - viewY) vY = smallY - viewY;
51  bigpico.style.marginLeft = - vX * bl;
52  bigpico.style.marginTop = - vY * bl;
53  view.style.left = vX + smallbox.offsetLeft + border;
54  view.style.top = vY + smallbox.offsetTop + border;
55 }
56 //-->
57 </script>
58 <style type="text/css">
59 <!--
60 *{padding:0;margin:0}
61 body{background:black}
62 img{display:block;}
63 #smallbox{border:1px #c33 solid;float:left;width:0;height:0;overflow:hidden;font-size:0px}
64 #bigbox{border:1px #c33 solid;width:0px;height:0px;float:left;overflow:hidden;font-size:0px}
65 #view{border:1px #ddd solid;width:0px;height:0px;position:absolute;font-size:0px}
66 #head{text-align:center;line-height:40px;font:bold 16px/40px;color:pink}
67 //-->
68 </style>
69  </HEAD>
70  <body MS_POSITIONING="GridLayout">
71   <form id="Form1" method="post" runat="server">
72    <div id="head">图片loading...</div>
73 <div id="smallbox"><img id="smallpic" src="Upimages/ShopImages/<%=simage%>" border="0" onmousemove="move(event)"></div>
74 <div id="bigbox"><div id="bigpico"><img id="bigpic" src="Upimages/ShopImages/<%=zimage%>" border="0"></div></div>
75 <div id="view" onmousemove="if (!isIE) move(event)"></div>
76   </form>
77  </body>
78 </HTML>
其中的<%=simage%>,<%=zimage%>都是程序调用的。预览效果如下：
js图片放大镜 可动态更换图片

js图片放大镜可动态更换图片
