Lua中的类编程代码实例

技术  /  管理员 发布于 5年前   474

Lua的类有点像javascript,但是更简明灵活，table即对象，对象就是类。Metatables比起ruby里的MetaClass更加好用，缺点是实例化和继承的代码有点多，

不像ruby里的“<”和“<<”,继承链就是查找方法时的方法链。

Account={  test1=function(a) print("Account test1") end}Account.test2=function(a) print("Account test2") endfunction Account.test3(a) print("Account test3") endfunction Account:new (o) --类的实例化  o = o or {}  setmetatable(o, self)  self.__index = self  return oendfunction Account.print0(o,a)  print(a)endfunction Account:print1(a)  print(a)end--方法定义测试Account.test1()Account.test2()Account.test3()--类测试acc=Account:new()acc.test1()acc.print0(acc,"dot print0")acc:print0("not dot print0")acc.print1(acc,"dot print1")acc:print1("not dot print1")acc.specialMethod=function(specialMethodTest)  print(specialMethodTest)endacc.specialMethod("smt test")--继承测试SpecialAccount = Account:new()s = SpecialAccount:new{limit=1000.00}--多重继承测试Named = {}function Named:getname ()  return self.nameendfunction Named:setname (n)  self.name = nendlocal function search (k, plist)  for i=1, table.getn(plist) do    local v = plist[i][k]    if v then return v end  endendfunction createClass (...)  local c = {}   -- new class  setmetatable(c, {__index = function (t, k)  return search(k, arg)end})c.__index = cfunction c:new (o)  o = o or {}  setmetatable(o, c)  return oend  return cendNamedAccount = createClass(Account, Named)account = NamedAccount:new{name = "Paul"}print(account:getname())