js放大镜

<!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>

<style type="text/css">

#div1 { width:304px; height:222px; position:relative; margin:30px auto 0px;}

#div1 img{width:304px; height:222px;}

#div1 span { width:100px; height:100px; background:red; left:0px;top:0px; position:absolute; display:none; filter:alpha(opacity:20); opacity:0.2;}

.show { width:100%; height:100%; background:red; position:absolute; z-index:10px; filter:alpha(opacity:10); opacity:0.1; left:0px; top:0px; }

#div2 {width:304px; height:222px; position:relative; display:none; overflow:hidden; margin:0px auto 0px;}

#img1 { position:absolute;}

</style>

<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />

<title>Javascript 图片放大代码</title>

<script type="text/javascript">

window.onload=function ()

{

var oDiv=document.getElementById('div1');

var oShow=oDiv.getElementsByTagName('div')[0];

var oSpan=oDiv.getElementsByTagName('span')[0];

var oImg=document.getElementById('img1');

oShow.onmouseover=function()

{

oSpan.style.display='block';

oImg.parentNode.style.display='block';

};

oShow.onmouseout=function()

{

oSpan.style.display='none';

oImg.parentNode.style.display='none';

};

oShow.onmousemove=function(ev)

{

var oEvent=ev||event;

var x=oEvent.clientX-oDiv.offsetLeft-oSpan.offsetWidth/2;

var y=oEvent.clientY-oDiv.offsetTop-oSpan.offsetHeight/2; 

if(x<0)

{

x=0;

}

else if(x>oShow.offsetWidth-oSpan.offsetWidth)

{

x=oShow.offsetWidth-oSpan.offsetWidth;

}

if(y<0)

{

y=0;

}

else if(y>oShow.offsetHeight-oSpan.offsetHeight)

{

y=oShow.offsetHeight-oSpan.offsetHeight

} 

oSpan.style.left=x+'px';

oSpan.style.top=y+'px';

var percentX=x/(oShow.offsetWidth-oSpan.offsetWidth);

var percentY=y/(oShow.offsetHeight-oSpan.offsetHeight);

var oImgparent=oImg.parentNode;

oImg.style.left=-percentX*(oImg.offsetWidth-oImgparent.offsetWidth)+'px';

oImg.style.top=-percentY*(oImg.offsetHeight-oImgparent.offsetHeight)+'px';

};

};

</script>

</head>

<body>

<div id="div1">

<img src="http://files.jb51.net/demoimg/201102/11_2_2.jpg" />

<span></span>

<div class="show"></div>

</div>

<div id="div2">

<img id="img1" src="http://files.jb51.net/demoimg/201102/11_2_2.jpg" />

</div>

</body>

</html>
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