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@@ -0,0 +1,97 @@
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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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+ #small {
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+ width: 400px;
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+ height: 400px;
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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, 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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+ #big {
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+ width: 400px;
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+ height: 400px;
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+ position: absolute;
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+ top: 0;
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+ left: 400px;
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+ overflow: hidden;
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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 id="bigImg" src="./images/7.jpg" alt="" />
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+ </div>
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+ </div>
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+ <script>
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+ var small = document.getElementById("small");
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+ var big = document.getElementById("big");
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+ var drag = document.getElementById("drag");
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+ var bigImg = document.getElementById("bigImg");
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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.left = smallLeft + "px";
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+ drag.style.top = smallTop + "px";
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+ if (drag.offsetLeft <= 0) {
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+ drag.style.left = 0;
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+ }
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+ if (drag.offsetTop <= 0) {
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+ drag.style.top = 0;
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+ }
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+ // 求出遮罩在小盒子最大的可移动范围
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+ var left1 = small.offsetWidth - drag.offsetWidth;
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+ var top1 = small.offsetHeight - drag.offsetHeight;
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+ if (drag.offsetLeft > left1) {
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+ drag.style.left = left1 + "px";
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+ }
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+ if (drag.offsetTop > top1) {
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+ drag.style.top = top1 + "px";
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+ }
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+ // 大盒子可移动的最大范围
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+ var bigLeft = bigImg.offsetWidth - big.offsetWidth;
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+ var bigTop = bigImg.offsetHeight - big.offsetHeight;
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+ // 移动的比例
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+ var x = drag.offsetLeft / left1;
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+ var y = drag.offsetTop / top1;
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+ // 大图片的移动
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+ bigImg.style.top = -bigTop * y + "px";
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+ bigImg.style.left = -bigLeft * x + "px";
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+ };
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+ </script>
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+ </body>
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+</html>
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