9、lua中的self，点号，冒号的关系

lua编程中，经常遇到函数的定义和调用，有时候用点号调用，有时候用冒号调用。

点号定义、点号调用

girl = {money = 200}
function girl.goToMarket(girl ,someMoney)
    girl.money = girl.money - someMoney
end
girl.goToMarket(girl ,100)
print(girl.money)

冒号定义、冒号调用

boy = {money = 200}
function boy:goToMarket(someMoney)
    self.money = self.money - someMoney
end
boy:goToMarket(100)
print(boy.money)

点定义、冒号调用

boy = {money = 200}
function boy.goToMarket(self ,someMoney)
    self.money = self.money - someMoney
end
boy:goToMarket(100)
print(boy.money)

冒点定义、点号调用

girl = {money = 200}
function girl:goToMarket(someMoney)
    self.money = someMoney
end
girl.goToMarket(girl, 100)
print(girl.money)