请问，获得鼠标坐标的代码得到的是鼠标箭头尖的位置吗？我怎么感觉是中间的，怎么获得箭头尖的位置呢？

function mouseX(event)
                {
                if(!event)
                {
                    return window.event.clientX + (document.documentElement.scrollLeft || document.body.scrollLeft);
                }
                else
                {
                    return event.pageX;
                }
            }
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FROM 211.99.222.*