效果图：
代码如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
*{padding:0; margin:0;}
#img1{width:300px; height:200px;}
#sp1{width:60px; height:40px; position: absolute; left:0; top:0; background: rgba(62, 55, 58, 0.4)
}
#img2{width:2250px; height:1500px; position: absolute;}
div{width:450px; height:300px; position: absolute; left:310px; top:0; overflow: hidden; border:2px solid black; display: none;}
</style>
<script>
window.onload=function(){
var img1 = document.getElementById('img1');
var img2 = document.getElementById('img2');
var sp = document.getElementById('sp1');
var oBox = document.getElementById('box');
sp.onmouseover=function(){
oBox.style.display='block';
};
sp.onmouseout=function(){
oBox.style.display='none';
};
document.onmousemove=function(ev){
var x = (ev.clientX || event.clientX)-sp.offsetWidth/2;
var y = (ev.clientY || event.clientY)-sp.offsetHeight/2;
if((ev.clientX || event.clientX)<sp.offsetWidth/2){
x = 0;
}
if((ev.clientX || event.clientX)>img1.offsetWidth-sp.offsetWidth/2){
x = img1.offsetWidth-sp.offsetWidth;
}
if((ev.clientY || event.clientY)<sp.offsetHeight/2){
y = 0;
}if((ev.clientY || event.clientY)>img1.offsetHeight-sp.offsetHeight/2){
y = img1.offsetHeight-sp.offsetHeight;
}
if((ev.clientX || event.clientX)<300 && (ev.clientY || event.clientY)<200) {
sp.style.left = x + 'px';
sp.style.top = y + 'px';
img2.style.left = -x * (img2.offsetWidth / img1.offsetWidth) + 'px';
img2.style.top = -y * (img2.offsetHeight / img1.offsetHeight) + 'px';
}
}
}
</script>
</head>
<body>
<img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1489083204637&di=244fe324db033fc826de48e90d2373f0&imgtype=0&src=http%3A%2F%2Fpic2015.5442.com%2F2016%2F0328%2F025%2F5.jpg%2521960.jpg
" id="img1">
<span id="sp1"></span>
<div id="box">
<img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1489083204637&di=244fe324db033fc826de48e90d2373f0&imgtype=0&src=http%3A%2F%2Fpic2015.5442.com%2F2016%2F0328%2F025%2F5.jpg%2521960.jpg
" id="img2">
</div>
</body>
</html>
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