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利用JS实现购物网站商品放大镜效果

大家几乎都有在网上购物的经验,有的网站会有一个商品放大镜功能,

就是把鼠标移到图片上的时候,旁边会有另外一张大的图片展示,等同于

放大镜效果,那这样的效果怎样实现的呢,我把代码发给大家,请大家参考。

<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title>放大镜</title>    <style>    *{margin:0;padding: 0;}    #warp{width: 1184px;height:500px;margin:50px auto 0;background-color: #ccc;overflow: hidden;padding: 10px;position: relative;}    #warp #minbox{width: 350px;height: 350px;float: left;position: relative;}    #maxbox{width: 400px;height: 400px;position: absolute;left: 380px;overflow: hidden;display: none;}    #maxbox img{width: 800px;height: 800px;position: absolute;}    #con{float: left;margin-left: 20px;}    #meng{width: 175px;height: 175px;position: absolute;background-color:yellow;opacity:0.4;filter:alpha(opacity=40);left: 0;top: 0;display: none;}    </style></head><body>    <div id="warp">        <div id="minbox">            <img src="images/min.jpg" alt="">            <p id="meng"></p>        </div>        <div id="maxbox">            <img src="images/max.jpg" alt="">        </div>        <div id="con">            <img src="images/msg.png" alt="">        </div>    </div>    <script>        var minbox=document.getElementById(minbox);        var meng=document.getElementById(meng);        var maxbox=document.getElementById(maxbox);        var maximg=maxbox.getElementsByTagName(img)[0];        var minimg=minbox.getElementsByTagName(img)[0];        function offsetTL(obj){            var ofL=0,ofT=0;            while(obj){                ofL+=obj.offsetLeft+obj.clientLeft;                ofT+=obj.offsetTop+obj.clientTop;                obj=obj.offsetParent;            }            return{left:ofL,top:ofT};        }        minbox.onmousemove=function(e){            var e=e||window.event;            meng.style.display=block;            maxbox.style.display=block;            var niubi1=e.clientX-offsetTL(minbox).left-meng.clientWidth/2;//蒙板的X坐标            var niubi2=e.clientY-offsetTL(minbox).top-meng.clientHeight/2;//蒙板的Y坐标            var bili=maximg.clientWidth/minimg.clientWidth;            if (niubi1<=0) {                niubi1=0;            }else if (niubi1>=minbox.clientWidth-meng.clientWidth) {                niubi1=minbox.clientWidth-meng.clientWidth;            }            if (niubi2<=0) {                niubi2=0;            }else if (niubi2>=minbox.clientHeight-meng.clientHeight) {                niubi2=minbox.clientHeight-meng.clientHeight;            }            console.log(niubi1);            console.log(niubi2);            meng.style.left=niubi1+px;            meng.style.top=niubi2+px;            maximg.style.left=-parseInt(meng.style.left)*bili+px;            maximg.style.top=-parseInt(meng.style.top)*bili+px;        }        minbox.onmouseout=function(){            meng.style.display=none;            maxbox.style.display=none;        }    </script></body></html>

 

利用JS实现购物网站商品放大镜效果