<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
#small{width: 190px;height: 280px;border: 1px solid black;position: absolute;left: 100px;top: 150px;}
#small img{width: 100%;height: 100%;}
#big img{width: 760px;height: 1120px;position: absolute;}
#big{display:none;overflow:hidden;width: 380px;height: 560px;border: 1px solid black;position: absolute;left: 400px;top: 10px;}
#mark{display:none;width:95px;height:140px;background-color: white;opacity: 0.5;filter: alpha(opacity=50)/* 兼容 */;position: absolute;left: 0px;top: 0px;}
</style>
</head>
<body>
<div id="small">
<img src="download.jpg" alt="">
<div id="mark"></div>
</div>
<div id="big">
<img src="download.jpg" alt="">
</div>
</body>
</html>
<script src="jquery-3.4.1.js"></script>
<script>
/*
*/
$(function(){
$('#small').mouseenter(function(){
$('#mark,#big').show();
}).mouseleave(function(){
$('#mark,#big').hide();
}).mousemove(function(ev){
var l = ev.pageX - $(this).offset().left -47;
var t = ev.pageY - $(this).offset().top -70;
if(l<=0){
l=0
}
if(l>=95){
l=95;
}
if(t<=0){
t=0;
}
if(t>=140){
t=140;
}
//改变遮罩层位置
$('#mark').css({
left: l,
top: t
})
//同时放大图片的位置，两倍于遮罩层的位置，注意反方向的
$('#big img').css({
left: -4 * l,
top: -4 *t
})
})
})
</script>
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