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                ## **全局函數** ``` function max(num1,num2) if(num1>num2)then ? ? ? result=num1; else ? ? ? result=num2; end return result; end ``` ## **局部函數**(local聲明局部函數) ``` local function demo() return true; end ``` 函數做為參數 ``` myprint=function(param) print("hello ",param,"!") --[函數可以返回多個值] return 1,2 end myprint("dash") --[輸出 hello dash ! 12] ``` ## **可變參數** >[info] 使用三點...表示函數有可變數目的參數 ~~~ function add(...) local s = 0 for i, v in ipairs{...} do // {...} 表示一個由所有變長參數構成的數組 s = s + v end return s end print(add(3,4)) //7 print(add(3,4,5,6,7)) //25 ~~~ ### 篤定參數+變長參數 ``` function demo(fmt,...) ---> 固定的參數是fmt return io.write(string.format(fmt,...)) end demo("runoob\\n") //runoob demo("%d%d\\n",1,2) // 12 ``` ### 獲取可變參數的數量:select("#",...) ``` function demo(...) print("參數的個數為:"..select("#",...)) end demo(1,2,3) //參數的個數為:3 ``` ### 獲取指定可變參數:select(n,...) ``` do function foo(...) for i=1,select('#',...) do -->獲取參數總數 local arg = select(i,...); -->讀取參數 print("arg",arg); end end ? ? foo(1,2,3,4); end ``` ### 獲取**n**到**select('#',…)**的參數:select(n, …) ``` do functionfoo(...) for i = 1,select('#',...) do -->獲取參數總數 local arg = select(i,...); -->讀取參數 print("arg",arg); end end ? ? foo(1,2,3,4); end ``` 輸出結果為: ~~~ arg????1 arg????2 arg????3 arg????4 ~~~
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