--CCLayer就是一帧图层
		ccLayer = CCLayerColor:create(ccc4(0,255,255))
		layerFarm:setVisible(true)
		layerFarm:addChild(ccLayer)	

ccc4是颜色RGBA格式， 0,255是纯蓝

255,255 纯红

0,255 纯绿

渐变背景

blue = 	ccc4(255,255)
		green = ccc4(0,255)
		gradiant = CCLayerGradient:create(blue,green)
		
		layerFarm:setVisible(true)
		layerFarm:addChild(gradiant)