JavaScript实现鼠标跟随图片效果

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>js鼠标移到</title>
<script type="text/javascript">
function Divflying(){
var div=document.getElementById('dv1');
if (!div) {
return;
}
var intX=window.event.clientX;
var intY=window.event.clientY;
div.style.left=intX+"px";
div.style.top=intY+"px";
}
document.onmousemove=Divflying;
</script>
</head>
<body>
<div id="dv1" style="position:absolute;">
<img src="fly.jpg"><br>
低调的跟着鼠标飘过~~
</div>
</body>
</html>