鼠标 X Y 坐标

<script type = "text/javascript" > 
function mousePosition(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; 
function mouseMove( ev) { 
    ev = ev || window.event; 
    var mousePos = mousePosition( ev) ; 
    document. getElementById('mouseXPosition').value=mousePos. x; 
    document. getElementById('mouseYPosition').value=mousePos. y; 
} 
</script> 

<fieldset> 
        <input id = mouseXPosition> 
        <input id = mouseYPosition> 
</fieldset>