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<html>
<head>
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>图片放大镜</title>
<style type="text/css">
body{ padding: 0;margin: 0;width: 100%;height:100%;overflow: hidden; }
.wrap{ text-align: center; }
.wrap img{ width: 60%;cursor: crosshair; }
.loupe{
position:absolute;
pointer-events:none;
visibility:hidden;
z-index:999;
width: 200px;
height: 200px;
border:3px solid #636363;
border-radius:50%;
}
</style>
</head>
<body>
<div class="loupe"></div>
<div class="wrap">
<img src="http://wx.karlew.com/loupe/img/pic.jpg">
</div>
</body>
</html>
<script type="text/javascript" src="http://cdn.bootcss.com/jquery/2.1.1/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
var vh=$(window).height()
var vw=$(window).width()
var imgh=$(".wrap img").height()
var imgw=$(".wrap img").width()
var beginX=vw*2/10
var endX=beginX+imgw
var beginY=(vh-imgh)/2
var endY=beginY+imgh
$(".wrap").css("margin-top",beginY+"px")
//鼠标经过
document.addEventListener("mousemove", loupe , false);
//触屏模式触发
document.addEventListener("touchmove", loupe , false);
document.addEventListener("touchstart", loupe , false);
document.addEventListener("touchend", function(e) {
$(".loupe").css("visibility","hidden")
}, false);
function loupe(e){
var x,y
if(e.type!="mousemove"){
x=e.touches[0].pageX
y=e.touches[0].pageY
}
//如果支持触摸事件，则屏蔽鼠标经过事件，避免影响touchstart的效果
else if("ontouchend" in document){
return false;
}
//如果不支持触摸事件，则让鼠标经过事件正常触发
else{
x=e.clientX
y=e.clientY
}
//判断鼠标或触摸点在图片区域，是则显示放大镜div层
if(x>beginX&&x<endX&&y>beginY&&y<endY){
var mx=100-(x-beginX)/imgw*1920 //1920为原图片宽度
var my=100-(y-beginY)/imgh*1200 //1200为原图片高度
var bg="url(http://wx.karlew.com/loupe/img/pic.jpg) "+mx+"px "+my+"px no-repeat #fff"
$(".loupe").css("left",x-103+"px").css("top",y-103+"px").css(‘background‘,bg)
$(".loupe").css("visibility","visible")
}else{
$(".loupe").css("visibility","hidden")
}
}
})
</script>
<html>
<head>
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>图片放大镜</title>
<style type="text/css">
body{ padding: 0;margin: 0;width: 100%;height:100%;overflow: hidden; }
.wrap{ text-align: center; }
.wrap img{ width: 60%;cursor: crosshair; }
.loupe{
position:absolute;
pointer-events:none;
visibility:hidden;
z-index:999;
width: 200px;
height: 200px;
border:3px solid #636363;
border-radius:50%;
}
</style>
</head>
<body>
<div class="loupe"></div>
<div class="wrap">
<img src="http://wx.karlew.com/loupe/img/pic.jpg">
</div>
</body>
</html>
<script type="text/javascript" src="http://cdn.bootcss.com/jquery/2.1.1/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
var vh=$(window).height()
var vw=$(window).width()
var imgh=$(".wrap img").height()
var imgw=$(".wrap img").width()
var beginX=vw*2/10
var endX=beginX+imgw
var beginY=(vh-imgh)/2
var endY=beginY+imgh
$(".wrap").css("margin-top",beginY+"px")
//鼠标经过
document.addEventListener("mousemove", loupe , false);
//触屏模式触发
document.addEventListener("touchmove", loupe , false);
document.addEventListener("touchstart", loupe , false);
document.addEventListener("touchend", function(e) {
$(".loupe").css("visibility","hidden")
}, false);
function loupe(e){
var x,y
if(e.type!="mousemove"){
x=e.touches[0].pageX
y=e.touches[0].pageY
}
//如果支持触摸事件，则屏蔽鼠标经过事件，避免影响touchstart的效果
else if("ontouchend" in document){
return false;
}
//如果不支持触摸事件，则让鼠标经过事件正常触发
else{
x=e.clientX
y=e.clientY
}
//判断鼠标或触摸点在图片区域，是则显示放大镜div层
if(x>beginX&&x<endX&&y>beginY&&y<endY){
var mx=100-(x-beginX)/imgw*1920 //1920为原图片宽度
var my=100-(y-beginY)/imgh*1200 //1200为原图片高度
var bg="url(http://wx.karlew.com/loupe/img/pic.jpg) "+mx+"px "+my+"px no-repeat #fff"
$(".loupe").css("left",x-103+"px").css("top",y-103+"px").css(‘background‘,bg)
$(".loupe").css("visibility","visible")
}else{
$(".loupe").css("visibility","hidden")
}
}
})
</script>
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原文地址：http://www.cnblogs.com/znj211985211/p/5391122.html
