原生JS实现商品详情页放大镜特效及冲突解决方案

<style type="text/css">
#div1 { width:304px; height:222px; position:relative; margin:30px auto 0px; border:2px solid red;}
#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=UTF-8" />
<title>JavaScript 图片放大代码</title>
<body>
<div id="div1">
<img src="http://demo.jb51.net/js/2017/html5-canvas-fangdajing-codes/s1.jpg" /> <!-- 本地图片路径 -->
<span></span> <!-- 鼠标滑动 放大区域 -->
<div class="show"></div>
</div>
<div id="div2"> <!-- 展示放大后的图片 -->
<img id="img1" src="http://demo.jb51.net/js/2017/html5-canvas-fangdajing-codes/s1.jpg" /> <!-- 本地大图片路径 -->
</div>
</body>

<script type="text/javascript">
//通过页面加载事件，使页面加载完毕自动执行
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;
//获得具体坐标
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>