lua实现单例模式

Singleton = {}
function Singleton:new(o)
o = o or {}
setmetatable(o,self)
self.__index = self
return o
end

function Singleton:Instance()
if self.instance == nil then
self.instance = self:new()
end
return self.instance
end

s1 = Singleton:Instance()

s2 = Singleton:Instance()

if s1 == s2 then
print("两个对象是相同的实例")
end