lua练习22-实现对象

Person = {name = "张三", age = 25}
function Person:eat()
    print(self.name.." is eating")
    print(self.name.."'s age is "..self.age)
end

--a = Person
--a.eat(a)

function Person:new(o)
    local t = o or {}

    setmetatable( t, { __index=self })  --调用一个属性的时候，如果t中不存在，那么会在__index 所指定的table中查找
    self.__index = self
    return t
end

Person1 = Person:new()
Person1.name = "李四"
Person1.age = 30
Person1:eat()
Person1.weight = 80

print(Person1.weight)

结果：
李四 is eating
李四's age is 30
80