Lua入门

  1 --函数
  2 function splitStr(theString)
  3     stringTable = {}
  4 
  5     local i = 1 -- 局部变量
  6     for word in string.gmatch(theString, "[^%s]+") do -- 用到了正则
  7         stringTable[i] = word;
  8         i = i + 1
  9     end -- for ... do ... end
 10 
 11     return stringTable, i
 12 end
 13 
 14 stringTable, numOfWord = splitStr("The Turtle Is A Dog ")-- 调用函数
 15 
 16 for j = 1, numOfWord-1, 1 do
 17     print(string.format("第 %d 个单词是 %s ", j, stringTable[j]));
 18 end
 19 
 20 -- 缺省参数函数
 21 function getSumMore(...)
 22     local sum = 0
 23     for k, v in pairs {...} do
 24         sum = sum + v
 25     end
 26     return sum
 27 end
 28 
 29 io.write("Sum ", getSumMore(1, 2, 3, 4, 5, 6), "\n")
 30 
 31 --好用
 32 double = function(x) return x*2 end
 33 print(double(8))
 34 
 35 --协程
 36 co = coroutine.create(function()
 37     for i=0, 10, 1 do
 38         print(i)
 39         print(coroutine.status(co))
 40         if i == 5 then -- if ... then ... end
 41             coroutine.yield() -- 协程挂起（让出资源）
 42         end
 43     end
 44 end
 45 )
 46 
 47 print(coroutine.status(co))
 48 
 49 coroutine.resume(co)
 50 
 51 co2 = coroutine.create(function() -- 协程创建
 52     for i = 100, 110, 2 do
 53         print(i)
 54     end
 55 end)
 56 
 57 coroutine.resume(co2) -- 唤醒（运行）
 58 coroutine.resume(co)
 59 
 60 --文件操作
 61 file = io.open("test.lua", "w+")
 62 file:write("This is the first line.\n")
 63 file:write("This is the second line.\n")
 64 
 65 --读一下文件,回到文件头部
 66 file:seek("set", 0)
 67 print(file:read("*a"))--后面的接上
 68 
 69 file:close()
 70 
 71 --继续使用
 72 file = io.open("test.lua", "a+")
 73 file:write("This is a extra line.\n")
 74 file:seek("set", 0)
 75 
 76 print(file:read("*a"))
 77 
 78 file:close()
 79 
 80 --OO伪造
 81 Animal = { height=0, weight=0, name="No name", sound="No Sound" }
 82 
 83 function Animal:new(height, weight, name, sound)
 84     setmetatable ( {}, Animal)
 85 
 86     self.height = height
 87     self.weight = weight
 88     self.name = name
 89     self.sound = sound
 90 
 91     return self
 92 end
 93 
 94 function Animal:toString()
 95     animalStr = string.format("%s weight %.1f lbs, is %.1f in tall and says %s.", self.name, self.weight, self.height, self.sound)
 96     return animalStr
 97 end
 98 
 99 yoci = Animal:new(10, 15, "yoci", "Woof")
100 
101 print(yoci.name)
102 print(yoci.sound)
103 print(yoci:toString())
104 
105 cat = Animal:new(2, 22, "candy", "miao")
106 print(cat.sound)