lua类实现

 1 _Account = {}
 2 
 3 --创建一张借记卡
 4 function _Account:new( tb )
 5     local _Tb = tb or {}
 6     _Tb._mBalance = _Tb._mBalance or 0
 7     setmetatable(_Tb, self)
 8     self.__index = self
 9     return _Tb
10 end
11 
12 --借记卡取款
13 function _Account:desposit( value )
14     if value > self._mBalance then
15         print("insufficient funds!")
16         return
17     end
18     self._mBalance = self._mBalance - value
19     print(string.format("You Get %s Money！", value))
20 end
21 
22 --存钱
23 function _Account:addBalance(val)
24     local num = val or 0
25     self._mBalance = self._mBalance + num
26 end
27 
28 local myAccount_2 = myAccount:new()
29 myAccount_2:addBalance(1000)
30 myAccount_2:desposit(200)
31 
32 -------------------------------------------------------
33 _Credit = _Account:new({_mLimit = 1000})
34 
35 --信用卡取款
36 function _Credit:desposit( value )
37     if value > self._mBalance + self._mLimit then
38         print("insufficient funds!")
39         return
40     end
41     self._mBalance = self._mBalance - value
42     print(string.format("You Get:%s Money", value))
43 end
44 
45 local cyCredit = _Credit:new()
46 cyCredit:desposit(500)