Lua OO 实现

1. 类的实现

testClass =
{
    id,
    num
};

testClass.__index = testClass

function testClass:new(id, num)
    local self = {}
    setmetatable(self, testClass)
    self.id = id
    self.num = num
    return self
end

function testClass:PrintNum()
    print("num is " .. self.num)
end

简单使用

local obj = testClass:new(10, 11)
obj:PrintNum()

得到输出num is 11

2. 类的继承

Class A

A = {}

function A:new(o)
    o = o or {}
    //self指向o
    setmetatable(o, self)
    //__index设为A
    self.__index = self
    return o;
end

function A:PrintClassName()
    print("this is class A")
end

function A:AMethod()
    print("this is AMethod !")
end

Class B继承Class A

B = A:new()

function B:PrintClassName()
    print("this is class B !")
end

使用示例

local obj = B:new()
obj:PrintClassName()
obj:AMethod()

输出

this is class B !

this is AMethod !