JavaScript 实现图片放大镜特效完整代码

<!doctype html>
<html lang="en">
<head>
 <meta charset="UTF-8" />
 <title>Document</title>
 <script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
 <style type="text/css">
  *{
   margin: 0;
   padding: 0;
  }
  .imgBox{
   width: 1000px;
   margin: auto;
   text-align: center;
  }
  .small,.large{
   font-size: 0;
   outline: 1px solid burlywood;
   margin: auto;
  }
  .small{
   margin: 20px auto;
  }
  .large{
   /*display: none;*/
  }
  .small,.small img,.large{
   width: 300px;
   height: 200px;
   overflow: hidden;
  }
  .large img{
   width: 900px;
   height: 600px;
  }
  .small,.large{
   position: relative;
  }
  .mark{
   opacity: 0.5;
   background-color: #DEB887;
   z-index: 55;
   width: 100px;
   height: 66.666666666px;
   display: none;
  }
  .mark,.large img{
   position: absolute;
   left: 0;
   top: 0;
  }
 </style>
</head>
<body>
 <div class="imgBox">
  <div class="small">
   <img src="img/img_14.jpg"/>
   <div class="mark"></div>
  </div>
  <div class="large">
   <img src="img/img_14.jpg"/>
  </div>
 </div>
 
 <script type="text/javascript">
  $(function(){
   var $small = $(".small"),
    $mark = $(".mark"),
    $large = $(".large");
   $small.on("mousemove",function(e){
// 在鼠标移到小图片中显示出mark
    $mark.css("display","block");
//    $large.css("display","block");
// 获取mark的一半宽度高度
    var hw = $mark.width()/2,
     hh = $mark.height()/2;
// 获取鼠标在当前图片中的位置
    var lf = e.pageX-$small.offset().left-hw,
     tt = e.pageY-$small.offset().top-hh;
// 获取mark的想x,y轴偏移率
    var ix = lf/$small.width(),
     iy = tt/$small.height();
// 获取边缘线
    var lb = 1-hw/$small.width()*2,
     tb = 1-hh/$small.height()*2;
// 计算和边缘的关系
    var ix = ix<lb?ix>0?ix:0:lb,
     iy = iy<tb?iy>0?iy:0:tb;
// 进行大图和小图百分比计算
    $mark.css("left",ix*100+"%").css("top",iy*100+"%");
    $large.children().css("left",-ix*300+"%").css("top",-iy*300+"%");
   }).on("mouseout",function(){
// 鼠标移出后mark隐藏
    $mark.css("display","none");
//    $large.css("display","none");
   })
  })
 </script>
</body>
</html>