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@@ -0,0 +1,88 @@
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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 http-equiv="X-UA-Compatible" content="IE=edge">
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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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+ }
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+ #container{
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+ position: relative;
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+ }
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+ #smallBox{
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+ width: 400px;
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+ height: 400px;
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+ }
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+ #bigBox{
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+ width: 800px;
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+ height: 800px;
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+ left: 400px;
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+ top: 0;
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+ position: absolute;
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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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+ left: 0;
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+ top: 0;
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+ display: none;
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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="smallBox">
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+ <img src="images/1.jpg" alt="">
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+ <div id="drag"></div>
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+ </div>
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+ <div id="bigBox">
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+ <img src="images/2.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('smallBox')
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+ var drag = document.getElementById('drag')
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+
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+ //鼠标划入显示遮罩层
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+ small.onmouseover = function(){
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+ drag.style.display = 'block'
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+ }
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+ //鼠标划出显示遮罩层
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+ small.onmouseout = function(){
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+ drag.style.display = 'none'
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+ }
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+ //鼠标滑动
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+ small.onmousemove = function(e){
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+ var xLeft = e.clientX - drag.offsetWidth / 2
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+ var xTop = e.clientY - drag.offsetHeight /2
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+
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+ drag.style.left = xLeft + 'px'
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+ drag.style.top = xTop + 'px'
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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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+ if(drag.offsetTop <= 0 ){
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+ drag.style.top = 0
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+ }
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+
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+ //横轴最大移动距离
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+ var zLeft = small.offsetWidth - drag.offsetWidth
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+ //纵轴最大移动距离
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+ var zTop = small.offsetHeight - drag.offsetHeight
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+ if(drag.offsetLeft > zLeft){
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+ drag.style.left = zLeft + 'px'
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+ }
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+ if(drag.offsetTop > zTop){
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+ drag.style.top = zTop + 'px'
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+ }
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+ }
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+ </script>
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+</body>
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+</html>
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zsydgithub
