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[Java教程]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>