lua中使用table实现类和继承
发布时间:2020-12-14 21:50:37 所属栏目:大数据 来源:网络整理
导读:-- 因为只有当读写不存在的域时,才会触发__index和__newindex classA = {className = " classA " ,name= " classAInst " } function classA:new(newobject) newobject = newobject or {} setmetatable (newobject,{__index = self}) -- 当在newobject找不到
--因为只有当读写不存在的域时,才会触发__index和__newindex classA = {className = "classA",name="classAInst"} function classA:new(newobject) newobject = newobject or {} setmetatable(newobject,{__index = self})--当在newobject找不到key对应的value时,就到self(即classA)类中查找 return newobject end function inherit(p) local newclass = {className = "classB",parent = p} setmetatable(newclass,{__index=p})--当在newclass中找不到key对应的value时,就到p类中查找 function newclass:new(newobject) newobject = newobject or {} setmetatable(newobject,{__index = newclass})--当在newobject找不到key对应的value时,就到newclass类中查找 return newobject end return newclass end testA = classA:new() print("testA ==> ",testA.className) print("testA ==> ",testA.name) testB = inherit(classA):new({name = "testB"}) print("testB ==> ",testB.className) print("testB ==> ",testB.name) testC = inherit(classA):new() print("testC ==> ",testC.className) print("testC ==> ",testC.name) testD = inherit(testB):new() print("testD ==> ",testD.className) print("testD ==> ",testD.name) testA ==> classAtestA ==> classAInsttestB ==> classBtestB ==> testBtestC ==> classBtestC ==> classAInsttestD ==> classBtestD ==> testB (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |