分享一则JavaScript滚动条插件源码

                if (arg0) {
                    if ((arg0.constructor == Event || arg0.constructor == MouseEvent) || (typeof (arg0) == “object” && arg0.preventDefault && arg0.stopPropagation)) {
                        return arg0;
                    }
                }
                func = func.caller;
            }
            return null;
        },
        getMousePos: function (ev) {
            /// <summary>
            ///     1: 获取当前鼠标坐标
            ///         1.1 – getMousePos(ev) – 获取当前鼠标坐标，兼容性处理，返回的对象格式：{ x:鼠标x坐标 , y:鼠标y坐标 }
            /// </summary>
            /// <param name=”ev” type=”Event”>
            ///     Event事件对象
            /// </param>
            /// <returns type=”Json” />
            if (!ev) {
                ev = currScroll.getEvent();
            }
            if (ev.pageX || ev.pageY) {
                return {
                    x: ev.pageX,
                    y: ev.pageY
                };