js 获取鼠标位置坐标

<html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> 
<title>javascript获得鼠标位置</title> 
</head> 
<body> 
<div id="lijj"  style="500px;height:500px;background:#000;">
</div>

<script> 
function mouseMove(ev) 
{ 
    Ev= ev || window.event; 
    var mousePos = mouseCoords(ev); 
    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.getElementById('lijj').onclick = mouseMove; 

</script> 
鼠标X轴: 
<input id=xxx type=text> 
鼠标Y轴: 
<input id=yyy type=text> 
</body>
人如代码，规矩灵活；代码如诗，字句精伦。