我准备调用回调函数的函数: function CarDriver:tapGas(self, callback) currentSpeed = currentSpeed + 10 callback(currentSpeed) end 调用过程: CarDriver:tapGas(Car.setSpeed) 然后我欢快的调用tapGas,踩着油门踏板。。。结果打印的self.speed = nil... 正确的调用过程应该是这样: CarDriver:tapGas(functio...