鼠标滑轮事件兼容性处理

        $("body").bind('mousewheel DOMMouseScroll', function (e) {
            var wheelDelta = e.originalEvent.wheelDelta || window.event.wheelDelta;
            if (wheelDelta) {
                //chrome、IE
                if (wheelDelta > 0) {
                    //$("header").css('display', 'block');
                    console.log("鼠标向上滚动");
                } else {
                    //$("header").css('display', 'none');
                    console.log("鼠标向下滚动");
                }
            } else {
                //firefox
                var detail = e.originalEvent.detail || window.event.detail;
                if (detail < 0) {
                    //$("header").css('display', 'block');
                    console.log("鼠标向上滚动");
                } else {
                    //$("header").css('display', 'none');
                    console.log("鼠标向下滚动");
                }
            }
        });