1 <!DOCTYPE html> 2 <html lang="en"> 3 4 <head> 5 <meta charset="UTF-8"> 6 <meta name="viewport" content="width=device-width, initial-scale=1.0"> 7 <title>Document</title> 8 <style> 9 * { 10 margin: 0px; 11 padding: 0px; 12 } 13 14 #small { 15 width: 322px; 16 height: 480px; 17 position: absolute; 18 left: 100px; 19 top: 100px; 20 border: 1px solid black; 21 } 22 23 #small img { 24 width: 100%; 25 height: 100%; 26 } 27 28 #mark { 29 width: 200px; 30 height: 200px; 31 background-color: black; 32 position: absolute; 33 opacity: 0.5; 34 filter: aplha(opacity=50); 35 left: 0px; 36 top: 0px; 37 display: none; 38 } 39 40 #big { 41 width: 400px; 42 height: 400px; 43 border: 1px solid black; 44 position: absolute; 45 top: 100px; 46 left: 500px; 47 display: none; 48 overflow: hidden; 49 } 50 51 #big img { 52 width: 644px; 53 height: 960px; 54 position: absolute; 55 } 56 </style> 57 <script src="../../jquery-1.10.1.min.js"></script> 58 <script> 59 $(function() { 60 $('#small').mouseenter(function() { 61 $('#mark').add('#big').show(20) 62 }).mouseleave(function() { 63 $('#mark').add('#big').hide(20) 64 }).mousemove(function(ev) { 65 var left = ev.clientX - $("#small").offset().left - $('#mark').width() / 2, 66 top = ev.clientY - $("#small").offset().top - $('#mark').height() / 2, 67 maxLeft = $("#small").outerWidth() - $('#mark').outerWidth(), 68 maxTop = $("#small").outerHeight() - $('#mark').outerHeight() 69 70 if (left < 0) left = 0 71 if (left > maxLeft) left = maxLeft 72 if (top < 0) top = 0 73 if (top > maxTop) top = maxTop 74 75 $('#mark').css({ 76 left: left, 77 top: top 78 }) 79 $("#big img").css({ 80 left: -2 * left, 81 top: -2 * top 82 }) 83 }) 84 }) 85 </script> 86 </head> 87 88 <body> 89 <div id='small'> 90 <img src="https://img2020.cnblogs.com/blog/1958222/202006/1958222-20200612091552231-1508736387.jpg" alt=""> 91 <div id='mark'></div> 92 </div> 93 <div id='big'> 94 <img src="https://img2020.cnblogs.com/blog/1958222/202006/1958222-20200612091552231-1508736387.jpg" alt=""> 95 </div> 96 </body> 97 98 </html>