JavaScript 实用的图片放大镜代码_图片特效特效

实用漂亮的放大镜效果，基于JavaScript代码实现，貌似代码不太多，但效果确实不错，因调用的图片比较大，所以运行效果后请稍等一会，等待图片加载。

<!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" mrc="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://p1.mb5u.com/texiao/1/20110225160611724.jpg" />
	<span></span>
	<div class="show"></div>
</div>
<div id="div2">
	<img id="img1" src="http://p1.mb5u.com/texiao/1/20110225160611724.jpg" />
</div>
</body>
</html>

所属频道：图片特效特效/更新时间：2012-11-03

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JavaScript 实用的图片放大镜代码_图片特效特效

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