目录
- 类
- 继承
- 私有性
- 单方法对象
星空中划过的不仅仅是流星，还有我对这个世界的畅想。
类
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| function Account:new(o)
o = o or {}
self.__index = self
setmetatable(o, self)
return o
end
SpecialAccount = Account:new()
s = SpecialAccount:new{limit = 1000.00}
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继承
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| local function search(k, plist)
for i = 1, plist do
local v = plist[i][k]
if v then
return v
end
end
end
function createClass(...)
local c = {}
local parents = {...}
setmetatable(c,{__index = function(t,k)--t代表自身
--return search(k, parents)
local v = search(k, parents)
t[k] = v
return v
end})
c.__index = c
function c:new(o)
o = o or {}
setmetatable(o, c)
return o
end
return c
end
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私有性
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| function newAccount(initBalance)
local self = { balance = initBalance }
local withdraw = function(v)
self.balance = self.balance - v
end
local deposit = function(v)
self.balance = self.balance + v
end
local getBalance = function()
return self.balance
end
return { withdraw = withdraw,
deposit = deposit,
getBalance = getBalance
}
end
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通过返回一个外部对象，这样就调用不到self了。
单方法对象
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| local function newObject(value)
return function(action,v)
if action == "get" then
return value
elseif action == "set" then
value = v
else
error("invalid action")
end
end
end
local d = newObject(0)
print(d("get"))
print(d("set", 10))
print(d("get"))
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