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@@ -0,0 +1,72 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+ <style>
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+ body{
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+ margin: 0;
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+ }
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+ .small-img{
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+ width: 400px;
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+ height: 400px;
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+ position: relative;
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+ }
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+ .small-img img{
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+ width: 100%;
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+ height: 100%;
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+ position: absolute;
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+ top:0;
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+ left: 0;
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+ }
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+ .box{
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+ width: 200px;
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+ height: 200px;
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+ background-color: #fff;
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+ position: absolute;
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+ top:0;
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+ left: 0;
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+ opacity: 0.5;
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+ }
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+ </style>
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+</head>
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+<body>
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+ <div class="container">
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+ <div class="small-img">
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+ <img src="./image/niu.png" alt="img">
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+ <div class="box"></div>
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+ </div>
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+ <div class="big-img"></div>
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+ </div>
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+ <script>
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+ var smallImg = document.getElementsByClassName("small-img")[0];
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+ var oBox = document.getElementsByClassName("box")[0];
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+
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+ smallImg.onmousemove = function(e){
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+ var _top = e.clientY-100;
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+ var _left = e.clientX-100;
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+
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+ // 控制左侧边界
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+ if(_left <= 0){
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+ _left = 0
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+ }
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+ // 控制顶部边界
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+ if(_top<=0){
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+ _top = 0;
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+ }
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+ // 控制右侧边界
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+ if(_left>=200){
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+ _left = 200;
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+ }
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+ // 控制底部
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+ if(_top>=200){
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+ _top = 200;
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+ }
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+
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+ oBox.style.top = _top + "px";
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+ oBox.style.left = _left + "px";
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+ }
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+ </script>
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+</body>
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+</html>
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