图片放大镜效果

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        .img-out{width: 180px;height: 180px;overflow: hidden;position: relative}
        .img-out span{width: 100px;height: 100px;background: yellow;opacity: 0.5;filter: alpha(opacity=50);position: absolute;left: 0;top: 0;display: none;}
        .zz{width: 180px;height: 180px;background: red;position: absolute;left: 0px;top: 0px;opacity: 0;filter: alpha(opacity=0);}
        #div2{width: 400px;height: 300px;overflow: hidden;position: absolute;left: 200px;top: 0px;}
        #div2 img{position: absolute;left: 0px;top: 0px;}
    </style>
</head>
<body>
    <div class="img-out" id="div1">
        <img src="img/b2.jpg" alt="">
        <span></span>
        <div class="zz"></div>
    </div>
    <div id="div2">
        <img src="img/b1.jpg" alt="">
    </div>
    <script>
        window.onload=function(){
            var oDiv=document.getElementById("div1");
            var oSpan=oDiv.getElementsByTagName('span')[0];
            var oDiv2=document.getElementById("div2");
            var img2=oDiv2.getElementsByTagName('img')[0]
            oDiv.onmouseover=function(){
                oSpan.style.display='block';

            }
            oDiv.onmouseout=function(){
                oSpan.style.display='none';
            }

            oDiv.onmousemove=function(ev){
                var ev=ev||window.event;
                var l=ev.clientX-oDiv.offsetLeft-(oSpan.offsetWidth/2);
                var t=ev.clientY-oDiv.offsetTop-(oSpan.offsetHeight/2);
                if(l<0){
                    l=0;
                }else if(l>oDiv.offsetWidth-oSpan.offsetWidth){
                    l=oDiv.offsetWidth-oSpan.offsetWidth;
                }

                if(t<0){
                    t=0;
                }else if(t>oDiv.offsetHeight-oSpan.offsetHeight){
                    t=oDiv.offsetHeight-oSpan.offsetHeight;
                }

                oSpan.style.left=l+'px';
                oSpan.style.top=t+'px';
                var scaleX=l/(oDiv.offsetWidth-oSpan.offsetWidth);
                var scaleY=t/(oDiv.offsetHeight-oSpan.offsetHeight);

                img2.style.left=-scaleX*(img2.offsetWidth-oDiv2.offsetHeight)+'px'
                img2.style.top=-scaleY*(img2.offsetHeight-oDiv2.offsetHeight)+'px'
            }

        }
    </script>
</body>
</html>