local function search(k, plist)
	for i, v in pairs(plist) do
		local temp_v = v[k]
		if temp_v then
			return temp_v
		end
	end
end

function createClass(...)
	local c = {}
	local parents = {...}
	
	--父类列表中搜索方法
	setmetatable(c, { __index = function(t, k) return search(k, parents) end } )
	c.__index = c
	
	--定义一个新的构造函数
	function c:new(o)
		o = o or {}
		setmetatable(o, c)
		return o
	end
	return c
end

Named = {}

function Named:getname()
	return self.name
end

function Named:setname(n)
	self.name = n
end

local NamedAccount = createClass(Account, Named)
account = NamedAccount:new({name = "Paul"})
print(account:getname())