JavaScript图片放大镜效果代码[代码比较简单]

#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;}

JavaScript 图片放大代码

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(xoShow.offsetWidth-oSpan.offsetWidth)
{
x=oShow.offsetWidth-oSpan.offsetWidth;
}
if(yoShow.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';
};
};

[Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]