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| Worker=People:new()
function Worker:new(o,n,a,id) o=o or People:new(o,n,a) setmetatable(o,self) self.__index=self o.id=id return o end
function Worker:__tostring() local sum=People.__tostring(self) sum=sum.."nID为:"..self.id return sum end
worker=Worker:new(nil,"kaka",55,01) print(worker) worker:walk()
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