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 <) {
                         event.preventDefault();//滑动到底部，再往下滑动，阻止滑动！
                     }
                 })
             }
             })