<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
}
#small {
width: 320px;
height: 320px;
margin: 100px 100px;
float: left;
/*border: 1px solid black;*/
position: relative;
}
#small img {
width: 100%;
height: 100%;
}
#meng {
width: 100px;
height: 100px;
background: white;
position: absolute;
opacity: 0.5;
display: none;
}
#big {
width: 400px;
height: 400px;
float: left;
overflow: hidden;
margin-top: 100px;
/*border: 1px solid black;*/
position: relative;
display: none;
}
#big img {
position: absolute;
}
</style>
<script>
window.onload = function () {
var small = document.getElementById('small');
var meng = document.getElementById('meng');
var big = document.getElementById('big');
small.onmouseover = function() {
meng.style.display = 'block';
big.style.display = 'block';
}
small.onmousemove = function (ev) {
var e = ev || window.event;
var mengOffsetX = e.clientX - 50 - small.offsetLeft;
var mengOffsetY = e.clientY - 50 - small.offsetTop;
var smallWidth = small.offsetWidth;
var smallHeight = small.offsetHeight;
if (mengOffsetX < 0) {
mengOffsetX = 0;
}
if (mengOffsetX >= smallWidth - 100) {
mengOffsetX = smallWidth - 100;
}
if (mengOffsetY < 0) {
mengOffsetY = 0;
}
if (mengOffsetY >= smallHeight - 100) {
mengOffsetY = smallHeight - 100;
}
meng.style.left = mengOffsetX + 'px';
meng.style.top = mengOffsetY + 'px';
var bigImg = big.getElementsByTagName('img')[0];
bigImg.style.left = mengOffsetX * -4 + 'px';
bigImg.style.top = mengOffsetY * -4 + 'px';
}
small.onmouseout = function () {
meng.style.display = 'none';
big.style.display = 'none';
}
}
</script>
</head>
<body>
<div id="small">
<div id="meng"></div>
<img src="../img/qb.jpg" alt="乔巴">
</div>
<div id="big">
<img src="../img/qb.jpg" alt="乔巴">
</div>
</body>
</html>
