js实时获得鼠标位置

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head>

<body>

<script>
function mouseMove(ev)
{
ev= ev || window.event;
  var mousePos = mouseCoords(ev);
  //alert(ev.pageX);
      document.getElementById('xxx').value = mousePos.x;
      document.getElementById('yyy').value = mousePos.y;
}

function mouseCoords(ev)
{
if(ev.pageX || ev.pageY){
   return {x:ev.pageX, y:ev.pageY};
}
return {
     x:ev.clientX + document.body.scrollLeft - document.body.clientLeft,
     y:ev.clientY + document.body.scrollTop     - document.body.clientTop
};
}

document.onmousemove = mouseMove;
</script>
Mouse X Position:
<input id=xxx type=text>
<br>Mouse Y Position:
<input id=yyy type=text>




</body>

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