用JavaScript中jQuery编写放大镜效果

 <!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>

         #big {

             width: 400px;

             height: 400px;

             border: 1px solid black;

             overflow: hidden;

             display: none;

             position: absolute;

             background-color: white;

             background-image: url('./image/1.bmp');

             opacity: 0.8;

         }

         #small {

             width: 350px;

             height: 350px;

             border: 1px solid black;

             background-image: url('./image/11.bmp');

         }

         #img {

             width: 800px;

             height: 800px;

         }

         #div {

             width: 175px;

             height: 175px;

             background-color: blue;

             opacity: 0.5;

             position: absolute;

             display: none;

         }

     </style>

 </head>

 <body>

     <div id="small">

         <div id="div"></div>

         <!-- <img src="./image/11.bmp" /> -->

     </div>

     <div id="img">

         <div id="big">

             <!-- <img src="./image/1.bmp" /> -->

         </div>

     </div>

     <script src="./jquery-1.12.4.min.js"></script>

     <script>

         //当鼠标在图片上移动时的操作

         $(window).on('load', function () {

             $("#small").on('mouseenter', function () {

                 let position = $(this).position();//获取small偏移

                 $("#big").css({//大的图片距离小的图片的距离

                     top: position.top,

                     left: position.left + $(this).width() + 80

                 }).show();

             })

             $("#small").on('mousemove', function (e) {//鼠标在图片上移动

                 let left1 =e.pageX-$(this).offset().left;

                 let top1=e.pageY-$(this).offset().top;

                 left1=left1-80<0?90:left1;

                 top1=top1-80<0?90:top1;

                 left1=left1-80>175?263:left1;

                 top1=top1-80>175?263:top1;

                 $('#div').css({//小方块显示

                     display: "block",

                     left:left1-80,

                     top:top1 -80

                 })

                 let position = $(this).position();

                 //第一种

                 //计算鼠标在图片上面的偏移坐标

                 // let X = e.pageX - position.left;

                 // let Y = e.pageY - position.top;

                 // //定位放大镜的距离

                 // $("#big").scrollTop(Y-100).scrollLeft(X-100);

                 // //第二种

                 let x =$("#div").position().left/350*800;

                 let y =$("#div").position().top/350*800;

                 $("#big").css({

                     backgroundPosition:`-${x}px -${y}px`

                 })

             });

             $("#small").on('mouseleave', function () {//鼠标移出时

                 $("#big").css({

                     display: "none"

                 })

                 $('#div').css({//小方块显示

                     display: "none",

                 })

             })

             // console.log($.unique($.merge([1,2],[2,3,4])))

         })

     </script>

 </body>

 </html>
巴特西

用JavaScript中jQuery编写放大镜效果

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