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                lua編程中,經常遇到函數的定義和調用,有時候用點號調用,有時候用冒號調用,這里簡單的說明一下原理。如: ### 點號調用: ~~~ -- 點號定義和點號調用: girl = {money = 200} function girl.goToMarket(girl ,someMoney) girl.money = girl.money - someMoney end girl.goToMarket(girl ,100) print(girl.money) ~~~ ### 引用參數self: ~~~ -- 參數self指向調用者自身(類似于c++里的this 指向當前類) girl = {money = 200} function girl.goToMarket(self ,someMoney) self.money = self.money - someMoney end girl.goToMarket(girl, 100) print(girl.money) ~~~ ### 冒號調用: ~~~ -- 冒號定義和冒號調用: girl = {money = 200} function girl:goToMarket(someMoney) self.money = self.money - someMoney end girl:goToMarket(100) print(girl.money) ~~~ 冒號定義和冒號調用其實跟上面的效果一樣,只是把第一個隱藏參數省略了,而該參數self指向調用者自身。 **總結:**冒號只是起了省略第一個參數self的作用,該self指向調用者本身,并沒有其他特殊的地方。 引用博文:http://www.xuebuyuan.com/1613223.html
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