QuickLuaTour翻译流水账(21-30)

-- Example 21  -- repeat until statement.a=0repeat    a=a+1    print(a)until a==5------ Output ------12345-- 例子 25  -- repeat until 语句-- Example 22 -- for statement-- Numeric iteration form.-- Count from 1 to 4 by 1for a=1,4 do io.write(a) endprint()-- Count from 1 to 6 by 3.for a=1,6,3 do io.write(a) end------ Output ------123414-- 例子22   -- for 语句-- 从1到4，每次自增1-- 从1到6，每次自增3-- Example 23   -- More for statement-- Sequential iteration form.for key,value in pairs({1,2,3,4}) do print(key, value) end------ Output ------1         12         23         34         4-- 例子 23  -- 更多的for语句-- 顺序迭代形式-- Example 24  -- Printing tables.-- Simple way to print tablesa={1,2,3,4,"five","elephant","mouse"}for i,v in pairs(a) do print(i,v) end------ Output ------1       12       23       34       45       five6       elephant7       mouse-- 例子 24  -- 打印表-- 简单的打印表的方式-- Example 25  -- break statement.-- break is used to exit a loop.a=0while true do     a=a+1    if a==10 thenbreak    endendprint(a)------ Output ------10-- 例子 25  -- break语句-- break用来跳出一个循环-- Example 26   -- Functions.-- Define a function without parameters or return value.function myFirstLuaFunction()    print("My First lua function was called")end-- Call myFirstLuaFunction.myFirstLuaFunction()------ Output ------My first lua function was called-- 例子 26  -- 函数-- 定义一个没有形参和返回值的方法-- Example 27  -- More functions.-- Define a function with a return value.function mySecondLuaFunction()    return "string from my second function"end-- Call function returning a value.a=mySecondLuaFunction("string")print(a)------ Output ------string from my second function-- 例子 27  -- 更多的函数-- 定义一个返回一个值函数--  Example 28  -- More functions.-- Define function with multiple parameters and multiple return values.function myFirstLuaFunctionWithMultipleReturnValues(a,b,c)    return a,b,c,"My first lua function with multiple return values",1, trueenda,b,c,d,e,f = myFirstLuaFunctionWithMultipleReturnValues(1,2,"three")print(a,b,c,d,e,f)------ Output ------1      2       true   My first lua function with multiple return values1      true-- 例子 28   -- 更多的函数定义一个有多个形参和返回值的函数-- Example 29  --  Variables scoping and functions-- All variables and global in scope by defaultb="global"-- To make local variables you must put the keyword 'local' in frontfunction myFunc()    local b=" local variable"    a="global variable"    print(a,b)endmyfunc()print(a,b)------ Output ------global variable  local variableglobal variable global-- 例子 29  -- 变量作用域和功能-- 所有的变量默认是全局变量-- 为了创建一个局部变量，必须在前面用关键字local修饰-- Example 30  -- Formatted printing.-- An implementation of printf.function printf(fmt, ...)    io.write(string.format(fmt, ...))endprintf("Hello %s from %s on %s\n",    os.getenv"USER" or "there", _VERSION, os.date())------ Output ------Hello there from Lua 5.1 on 06/20/12  10:36:12-- 例子 30  -- 格式化输出-- 一个printf的实现