QuickLuaTour翻译流水账(1-10)

-- Example 1  -- First Program.
-- Classic hello program.

print("hello")

-------- Output ------

hello

-- 例子 1  -- 第一个程序.
-- 经典的 hello 程序


-- Example 2    -- Comments.
-- Single line comments in Lua start with double hyphen.

--[[ Multiple line comments start
with double hyphen and two square brackets.
  and end with two square brackets. ]]

-- And of course this example produces no
-- output, since it's all comments!


-------- Output ------


-- 例子 2       -- 注释
-- 在语句前加2个连号即是单行注释

--[[ 在前面加2个连号和两个方括号，
在后面加两个方括号即是多行注释]]

-- 当然这个例子程序不会有任何输出，因为都是注释！


-- Example 3  --  Variables.
-- Variables hold values which have types, variables dont't have 

types.

a=1
b="abc"
c={}
d=print

print(type(a))
print(type(b))
print(type(c))
print(type(d))

------ Output -------

number
string
table
function

-- 例子 3  --  变量
-- 变量持有拥有类型的值，变量本身没有类型

------ Output -------


-- Example 4  -- Variable name.
-- Variable names consist of letters, digits and underscores.
-- They cannot start with a digit.

one_two_3 = 123  -- is valid variable name

-- 1_two_3 is not a valid variable name.

------  Output  -------


-- 例子 4  -- 变量名
-- 变量名由字母，数字和下划线组成
-- 它们不能以数字开头


one_two_3 = 123  -- 是合法的变量名

-- 1_two_3 不是合法的变量名


-- Example 5  -- More Variable names.
-- The underscore is typically used to start special values.
-- like _VERSION in Lua.

print(_VERSION)

-- So don't used variables that start with _,
-- but a single underscore _ is often used as a 
-- dummy variable.


------- Output -------

Lua 5.1


-- 例子 5  -- 变量名称续集
-- 要开始一个特殊的变量，通常以下划线开头
-- 例如Lua中的_VERSION

print(_VERSION)

-- 所以不要使用下划线来命名变量
-- 但是以一个下划线命名的变量通常用来充当哑变量


-- Example 6  -- Case Sensitive
-- Lua is case sensitive so all variable names & keywords
-- must be in correct case.

ab=1
Ab=2
AB=3
print(ab,Ab,AB)


------ Output ------

1      2       3


-- 例子6  -- 大小写的区分
-- Lua是区分大小写的，所以所有的变量名和关键字都必须正确的大小写


-- Example 7  -- Keywords
-- Lua reserved words are: and, break, do, else, elseif,
-- end, false, for, function, if, in, local, nil, not, or,
-- repeat, return, then, true, until, while.

-- Keywords cannot be used for variable names,
-- 'and' is a keyword, but AND is not, so it is a legal variable name.

AND=3
print(AND)


------ Output ------

3


-- 例子 7  -- 关键字
-- Lua 保留字如下：and, break, do, else, elseif,
-- end, false, for, function, if, in, local, nil, not, or,
-- repeat, return, then, true, until, while.

-- 关键字不能作为变量名
-- ‘and'是关键字，但是AND不是，所以这是个合法的变量名


-- Example 8  -- Strings.

a="single 'quoted' string and double \"quoted\" string inside"
b='single \'quoted\' string and double "quoted" string inside'
c = [[ multiple line
with 'single'
and "double" quoted strings inside.]]

print(a)
print(b)
print(c)

------- Output ------

single 'quoted' string and double "quoted" string inside
single 'quoted' string and double "quoted" string inside
 multiple line
with 'single'
and "double" quoted strings inside.

-- 例子 8   -- 字符串

不译。如果字符串用单引号包裹，在串中的单引号需要转义；用双引号同理；[[ 

多行注释 ]]


-- Example 9  -- Assignments
-- Multiple assignments are valid.
-- var1,var2=var3,var4

a,b,c,d,e = 1, 2, "three", "four", 5

print(a,b,c,d,e)


------ Output ------

1     2        three   four     5


-- 例子9  -- 赋值
-- 多重赋值是合法的


-- Example 10  -- More Assignments.
-- Multiple assignments allows one line to swap two variables.

print(a,b)
a,b=b,a
print(a,b)

------ Output ------


-- 例子 10  -- 赋值续集
-- 多重赋值允许使用一行语句交换2个变量的值