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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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+ * {
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+ margin: 0;
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+ padding: 0;
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+ list-style: none;
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+ text-decoration: none;
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+ box-sizing: border-box;
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+ }
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+ #container {
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+ position: relative;
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+ }
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+ #small {
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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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+ #big {
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+ position: absolute;
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+ top: 0;
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+ left: 400px;
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+ width: 400px;
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+ height: 400px;
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+ overflow: hidden;
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+ display: none;
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+ }
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+ #drag {
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+ width: 200px;
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+ height: 200px;
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+ background:rgba(0,0,0,.3);
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+ position: absolute;
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+ top: 0;
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+ left: 0;
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+ display: none;
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+ }
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+ #bigImg {
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+ position:absolute;
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+ }
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+ </style>
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+</head>
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+<body>
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+ <div id="container">
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+ <div id="small">
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+ <img src="./images/6.jpg" alt="">
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+ <div id="drag"></div>
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+ </div>
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+ <div id="big">
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+ <img src="./images/7.jpg" id="bigImg" alt="">
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+ </div>
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+ </div>
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+ <script>
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+ var drag = document.getElementById("drag");
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+ var small = document.getElementById("small");
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+ var bigImg = document.getElementById("bigImg");
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+ var big = document.getElementById("big");
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+ // 思路：鼠标移入小盒子时 遮罩显示 大盒子显示
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+ // 鼠标移出小盒子是 遮罩隐藏 大盒子隐藏
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+ small.onmouseover = function() {
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+ drag.style.display = 'block';
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+ big.style.display = 'block';
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+ }
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+ small.onmouseout = function() {
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+ drag.style.display = 'none';
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+ big.style.display = 'none';
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+ }
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+ small.onmousemove = function(e) {
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+ var smallLeft = e.clientX - drag.offsetWidth / 2;
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+ var smallTop = e.clientY - drag.offsetHeight / 2;
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+ drag.style.top = smallTop + 'px';
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+ drag.style.left = smallLeft + 'px';
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+ if(drag.offsetTop <=0) {
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+ drag.style.top = 0;
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+ }
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+ if(drag.offsetLeft <=0) {
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+ drag.style.left = 0;
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+ }
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+ // 思路：求出遮罩最大可移动的范围
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+ var maxLeft = small.offsetWidth - drag.offsetWidth;
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+ var maxTop = small.offsetHeight - drag.offsetHeight;
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+ if(drag.offsetLeft > maxLeft) {
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+ drag.style.left = maxLeft + 'px';
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+ }
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+ if(drag.offsetTop > maxTop) {
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+ drag.style.top = maxTop + 'px';
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+ }
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+ // 思路：求出大盒子最大可移动的范围
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+ var bigLeft = bigImg.offsetWidth - big.offsetWidth;
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+ var bigTop = bigImg.offsetHeight - big.offsetHeight;
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+ var x = drag.offsetLeft / maxLeft;
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+ var y = drag.offsetTop / maxTop;
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+ bigImg.style.left = -x * bigLeft + 'px';
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+ bigImg.style.top = -y * bigTop + 'px';
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+ console.log(drag.offsetLeft)
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+ }
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+ </script>
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+</body>
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+</html>
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