Lua继承的一个例子

main.lua

require("base")
require("actor")

function main()
local obj = actor.new("tiny")
obj:init()
obj:say_hi()
obj:work()
end

main()

base.lua

_G.base = {
init = function(self)
self.x = 10
self.y = 10
print("base.lua init")
end,

say_hi = function(self)
print( string.format("base.lua say_hi x: %d, y: %d",self.x,self.y))
end,

work = function(self)
print("this is base work")
end
}

actor.lua

_G.actor = {}
setmetatable(_G.actor,{__index = _G.base })

function new(name)
obj = {name = name}
setmetatable(obj,{__index = _G.actor })
return obj
end

function init(self)
getmetatable(getmetatable(self).__index).__index.init(self)
self.hp = 10
end

function say_hi(self)
getmetatable(getmetatable(self).__index).__index.say_hi(self)
print(string.format("actor this is actor:say_hi, hp: %d", self.hp))
end

_G.actor.new = new
_G.actor.init = init
_G.actor.say_hi = say_hi

base.lua init
base.lua say_hi x: 10, y: 10
actor this is actor:say_hi, hp: 10
this is base work