console
<!DOCTYPE html>
<html>
<head>
<meta charset="{CHARSET}">
<title></title>
<style>
#div1{width: 100px;height: 100px;background: red;position: absolute;}
</style>
<script>
window.onload = function(){
var i=0;
var oDiv = document.getElementById('div1');
document.onmousemove = function(ev){
var ev = ev || event;
var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
oDiv.style.left = ev.clientX +'px';
oDiv.style.top = ev.clientY + scrollTop+'px';
}
}
</script>
</head>
<body style="height: 2000px;">
<div id="div1"></div>
</body>
</html>