cocos2dx添加背景颜色

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

ccc4是颜色RGBA格式， 0, 0, 255, 255是纯蓝

255, 0, 0, 255 纯红

0, 255, 0, 255 纯绿

渐变背景

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

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