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用javascript制作放大镜放大图片

2006-11-03 17:01 621 查看
<html>
<head>
<title>emu</title>
</head>
<body>
<BR>
原图：<BR>
<img src=http://www.web745.com/image/logo.gif width="280" height="150" id=srcImg onmousemove="zoom()">
<BR>
局部放大图：<BR>
<div style="overflow:hidden"><img id=zoomImg></div>

<SCRIPT LANGUAGE="JavaScript">
<!--
zoomImg.src = srcImg.src;
srcImg.height = srcImg.height/2;
var zoomRate = 5; //放大倍数
zoomImg.height = srcImg.height*zoomRate;
zoomImg.parentNode.style.width = srcImg.width;
zoomImg.parentNode.style.height = srcImg.height;
function zoom(){
var elm = event.srcElement;
h = elm.offsetHeight/zoomRate/2;
w = elm.offsetWidth/zoomRate/2;
var x = event.x-elm.offsetLeft;
x=x<(elm.offsetWidth-w)?x<w?w:x:elm.offsetWidth-w;
zoomImg.style.marginLeft=(w-x)*zoomRate;
var y = event.y-elm.offsetTop;
y=y<(elm.offsetHeight-h)?y<h?h:y:elm.offsetHeight-h;
zoomImg.style.marginTop=(h-y)*zoomRate;
}
//-->
</SCRIPT>
</body>
</html>
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