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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title>放大镜</title>
</head>
<style type="text/css">
*{
padding: 0;
margin: 0;
}
.open{
width: 350px;
height: 350px;
position: relative;
}
.small{
width: 350px;
height: 350px;
border: 1px solid black;
overflow: hidden;
cursor: move;
}
.small img{
width: 350px;
height: 350px;
}
img{
border: none;
border: 0;
}
a img{
border: none;
border:0;
}
.big{
width: 350px;
height: 350px;
border: 1px solid black;
position: absolute;
left: 354px;
top: 0;
display: none;
overflow: hidden;
}
.big img{
width: 800px;
position: absolute;
top: 0;
left: 0;
}
.mask{
width: 150px;
height: 150px;
background: rgba(0,0,255,0.2);
position: absolute;
top: 0;
left: 0;
display: none;
}
</style>
<body>
<div class="open">
<div class="small">
<img src="img/small.jpg"/>
<div class="mask"></div>
</div>
<div class="big">
<img src="img/big.jpg"/>
</div>
</div>
</body>
<script type="text/javascript">
// window.onload = function(){}预加载
window.onload = function(){
var small = document.querySelector(‘.small‘);
var mask = document.querySelector(‘.mask‘);
var big = document.querySelector(‘.big‘);
// 鼠标触摸小图标，蒙版和放大效果出现
small.onmouseover = function(){
mask.style.display = ‘block‘;
big.style.display = ‘block‘;
}
// 鼠标一开，蒙版，放大效果消失
small.onmouseout = function(){
mask.style.display = ‘none‘;
big.style.display = ‘none‘;
}
// 小图标移动事件
small.onmousemove =function(event){
var oEvent = event || window.event;
// event||window.event兼容IE
var x = oEvent.clientX;
var y = oEvent.clientY;
var minX = x - mask.offsetWidth/2;
var minY = y - mask.offsetHeight/2;
if (x <=mask.offsetWidth/2) {
minX = 0;
}else if(x >= small.offsetWidth - mask.offsetWidth/2){
minX = small.offsetWidth - mask.offsetWidth;
}
if (y <= mask.offsetHeight/2) {
minY = 0;
}else if(y >= small.offsetHeight - mask.offsetHeight/2){
minY =small.offsetHeight -mask.offsetHeight;
}
// 蒙版在small里面的位置
mask.style.left = minX +‘px‘;
mask.style.top = minY +‘px‘;
var bigImg = document.querySelector(‘.big img‘);
var ratioX = minX/(small.offsetWidth - mask.offsetWidth);
var ratioY = minY/(small.offsetHeight - mask.offsetHeight);
bigImg.style.left = -ratioX *(bigImg.offsetWidth-big.offsetWidth) +‘px‘;
bigImg.style.top = -ratioY*(bigImg.offsetHeight-big.offsetHeight)+‘px‘;
}
}
</script>
</html>
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原文地址：http://www.cnblogs.com/lin-f/p/5854479.html
