监听滚动事件

 //监听scroll滚动 获取当前页数
            /*var scrollLock = null;
            var clickLock = false;
            $("#line").scroll(function(e) {
                if (scrollLock) {
                    clearTimeout(scrollLock);
                }
                var self = this;
                scrollLock = setTimeout(function () {
                    if (clickLock) {
                        return;
                    }
                    var scrollTop = $(self).scrollTop();
                    var symbol = 1; //1:+,0:-
                    if (self.lastScrollTop != null) {
                        if (scrollTop < self.lastScrollTop) {
                            symbol = 0;
                        }
                    } else {
                        this.lastScrollTop = 0;
                    }
                    calculateScrollTop(symbol);
                }, 200);
            });*/