$.ajax({      type: 'post',      url: "maintain_findRoomByBuildingId.shtml",      cache: false,      data: {"buildingId":buildingId},      dataType: 'json',      success: function(data){        jQuery.each(data.roomList, function(i,item){          alert(item.id+","+item.name);        });      },      error: function(){        return;      }    });