用空代理實現account（lua程序設計21.7練習21.4題）

function createAccount()local proxy = {}local mt = {balance = 0}mt.withdraw = function(v) mt.balance = mt.balance - v endmt.deposit = function(v) mt.balance = mt.balance + v endmt.getBalance = function() return mt.balance endsetmetatable(proxy,mt)mt.__index = mtreturn proxy endlocal account = createAccount() account.deposit(300) print(account.getBalance()) account.withdraw(100) print(account.getBalance())

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