function MainScene:onEnter()

     local item

     local item0

     local temptype =

     for i=, do

         temptype = math.floor(math.random(,))

         item = SpriteItem.new()

         item:setData(temptype)

         item:addTo(self.layer)

         item:setName(string.format("item%d", i))

         self.items[i] = item

         item:setPos(math.floor((i-)%row),math.floor((i-)/row))

         item0 = SpriteItem.new()

         item0:setData(temptype)

         item0:addTo(self.layer)

         self.items[i+] = item0

         item0:setName(string.format("item%d", i+))

         item0:setPos(math.floor((i+)%row),math.floor((i+)/row))

     end

     self:shuffle(self.items)

     self.layer:addNodeEventListener(cc.NODE_TOUCH_EVENT, handler(self, self.onTouched))

     self.layer:setTouchEnabled(true)

 end

 function MainScene:shuffle(t)

     local  len = #t

     for i=,len* do

         local a = math.floor(math.random(len))

         local b = math.floor(math.random(len))

         if a ~= b then

             t[a],t[b] = t[b],t[a]

             t[a]:setPos(math.floor((a-)%row),math.floor((a-)/row))

             t[b]:setPos(math.floor((b-)%row),math.floor((b-)/row))

             --printInfo("swap item %d : %d", a,b)

         end

     end

     --[[i = 1

     for i=1,len do

         print(t[i]:getName())

     end]]

 end

 function MainScene:getItem( posx, posy )

     --printInfo("getItem %d : %d", posx, posy)

     local px = math.round((posx - startX)/)

     local py = math.round((posy-startY)/)

     if px >  or py >  then

         return

     end

     local index = row * py + px +

     local item = self.items[index]

     return item

 end