<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<img id="tu" src="img/1.jpg" style="position: absolute; left: -400px; top: -200px; width: 200px; height: 200px;">
<script>
var tu=document.getElementById("tu");
document.onmousemove=a;
function a(b){
var x=b.clientX;
var y=b.clientY;
tu.style.top=y+2+"px";
tu.style.left=x+2+"px";
}
</script>
</body>
</html>
原文：http://www.cnblogs.com/wangxirui/p/6371464.html