滑动表层div时 禁止底层滑动

            $(".container").bind("touchstart", function (events) {
                startX = events.originalEvent.changedTouches[0].pageX;
                startY = events.originalEvent.changedTouches[0].pageY;
            });
            $(".fanslist_box").bind("touchmove", function (e) {
            var ulheight = $(this).height();
            var scrollTop = $(this).scrollTop();
            var scrollheight = $(this)[0].scrollHeight;
            if (ulheight + scrollTop + 20 >= scrollheight) { //滚到底部20px左右
                $(".fanslist_box").bind("touchmove", function (event) {
                    moveEndX = event.originalEvent.changedTouches[0].pageX,
                    moveEndY = event.originalEvent.changedTouches[0].pageY,
                    theX = moveEndX - startX;
                    theY = moveEndY - startY;
                    if (Math.abs(theY) > Math.abs(theX) && theY > 0) { //这里是判断上滑还是下滑！绝对值方式！
                        $(".fanslist_box").unbind("touchmove");//滑动到底部再往上滑动，解除阻止！ 
                    }
                    if (Math.abs(theY) > Math.abs(theX) && theY < 0) {
                        event.preventDefault();//滑动到底部，再往下滑动，阻止滑动！ 
                    } 
                })  
            }
            })