Lua语言基础

--lua基础

－－单行注释

--[[]

段落注释

]]--

--引用其他lua文件，不需要后缀

--require"xx"

--变量不需要定义，可以直接赋值

count =1000 --没有分号分割符，成员变量

local max =111  --局部变量

--方法定义

function hello(...)

--print

print("hello lua");

print(string.format(...));

end

--访问没有初始化的变量。lua will return nil

--call the function hello

hello("你know");

--pirnt the value of memeber

isOK = false

print(type(isOK))

--基本变量类型

a＝ nil

b =10

c =10.5

d = false

--定义字符串，单，双引号都可以

e = " i am mvp"

d = 'kevinLi'

--two strings can connect like this

stringA = "this is a "

stringB ="problem"

print(stringA..stringB);

--lua also support the transfer char

print(stringA.."\n"..stringB)

--modify the stringA about using gsub

stringA = string.gsub(stringA,"kevin","danel")

--字符和数字自动转换

stringC ="100"

stringC = tonumber(stringC)

stringC = stringC +20

stringC = tostring(stringC)

print(stringC.."\n".."nice lua")--..用于连接字符串

--取一个字符串长度使用

print(#stringC);

--lua only one struct that it is table

--create a table

tableA = {}

m ="x"

tableA[m] =100

m2 ='y'

tableA[m2] =200

print(tableA["x"].."\n"..tableA.y)

--table begin with1 index ,not zero

--table的数组下标从1开始

tableB = {"2","3","5"}

print(tableB[1])

--算术操作符

c1 =10+2

c2 =10-2

c3 =10*2

c4 =10/2

c5 =10^2

c6 =10%2

c7 =-10+2

print(c1.."_"..c2.."_"..c3.."_"..c4.."_"..c5.."_"..c6.."_"..c7)

--流程控制语句

--ifthen elseifthenelse end

abc =10

if abc ==10then

   print("V1")

elseif abc ==9then

   print("v2")

else

   print("v2")

end

--循环控制语句

for i = begin,end,adddo

   print("v2"..i+1)

end--end作为结束语句

--key ,value存储table

tableFor = {"kevin1","kevin2","kevin3"}

for k,vin pairs(tableFor)do

  print("key:"..k.."value"..v)

end

//TODO:

--while

w1 =20

while true do

w1=w1+1

if w1 ==25then

break

end

end

print("whlile:"..w1)

--repeat

aa =20

repeat aa = aa+2

print("repeat:"..aa)

until aa>28

--关系操作符

--需要注意的是不等于符号 ~= 而不是!=

ax =10

bx =20

if ax >bxthen

    print("GX1")

elseif ax<bxthen

    print("GX2")

elseif ax>=bxthen

    print("GX3")

elseif ax<=bxthen

    print("GX4")

elseif ax==bxthen

    print("GX5")

elseif ax~=bxthen

    print("GX6")

else

    print("GX7")

end

--next is the function

-- has a value returned

function funTest(abc)

    local abc = abc+1

    return abc

end

--have two or more values returned

function funTest2()

   return2,2,3

end

a,b = funTest2()

print("a"..a.."b"..b)

--有变长参数的函数

function funTest3 (...)--...类似指针引用，lua区别与c＋＋

    print(...)

end

--闭合函数，子函数再母函数声明和实现

function funTest4(...)

    print(...)

    local a =2

    a = a +2

    function funTest5(...)

        print(...)

    end

    funTest5(a)

end

funTest4(22)