lua中self的用法

--冒号：在定义时省略了self
--点号：在定义时不省略self

Class = {}
Class.__index = Class
  
function Class.new(x,y)
    local cls = {}
    setmetatable(cls, Class)
    cls.x = x
    cls.y = y
    return cls
end
function Class:test()
-- 等价于
-- function Class.test(self)
    print(self.x,self.y)
end
  
  
object = Class.new(10,20)
 
object:test()
-- 等价于
object.test(object)

可以把点号(.)作为静态方法来看待，冒号(:)作为成员方法来看待

function CreateStudent(ID,Name)  
   local Obj={id=ID,name=Name};  
    function Obj:GetID()  
       return self.id;  
    end   
    function Obj.GetName(self)  
       return self.name;  
    end   
    function Obj:SetID(ID)  
       self.id=ID;  
    end   
    Obj.SetName=function(self,Name)  
    self.name=Name  
    end   
    return Obj;  
end  
  
s1=CreateStudent(1,"andy");  
print("s1'id=",s1:GetID(),"s1'name=",s1.GetName(s1))  
  
s1:SetID(2);  
s1.SetName(s1,"lili");  
print("s1'id=",s1:GetID(),"s1'name=",s1:GetName())