鼠标的当前位置

意思搞的不是太明白，先发上来做为一个记录。

window.onload = function(){
            var a = document.getElementById('a');
            a.onmousemove = function(e){
                var pointer = getCroodsInDocument(e);
                var b = document.getElementById('b');
                b.innerHTML = 'x, y = (' + pointer.x + ',' + pointer.y + ')';
            }
            
            function getCroodsInDocument(e){
                e = e || window.event;
                var x = e.pageX || (e.clientX + (document.documentElement.scrollLeft || document.body.scrollLeft));
                var y = e.pageY || (e.clientY + (document.documentElement.scrollTop || document.body.scrollTop));
                return {
                    'x': x,
                    'y': y
                };
            }
        }

静态代码：

<div id="a">
            <div id="c"></div>
        </div>
        <div id="b">x</div>