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Lua 学习笔记

  • 2026-02-09 22:17:02
Lua 学习笔记

    最近做测量仪器的软件开发,需要一种脚本语言做对外接口,Lua的解析器小巧、语法简单、方便和C/C++绑定,所以选择了Lua,记录学习笔记如下:
    一个月前bellard大佬开源了用于嵌入式平台的MicroQuickJS引擎,本人完美错过,感兴趣的同学可以研究下,毕竟“所有能用JavaScript解决的问题,最后都会用JavaScript去解决”。

一、变量与类型

变量声明与赋值

  • 直接赋值即可声明变量,无需显式声明类型
  • 使用 local 声明局部变量,仅在当前作用域(如文件、函数、代码块)内有效
  • 未声明的变量默认值为 nil
  • 支持同时给多个变量赋值,例如:x, y, z = 1, 2, 3

Number(数值类型)

  • Lua 中所有数值均为 number 类型(内部可能为整数或浮点数,自动转换)

  • 支持多种表示方式:

    a = 42-- 十进制b = 0xFF-- 十六进制c = 3.14e-2-- 科学计数法
  • 支持常见算术运算(+-*/%)及位运算(>><<&|~

String(字符串类型)

类型转换

  • tostring(number):将数字转为字符串

  • tonumber(string):将字符串转为数字,失败则返回 nil

    print(tostring(123))        -- "123"print(tonumber("456"))      -- 456print(tonumber("abc"))      -- nil

二、Table(表)

基本特性

  • Table 是 Lua 中唯一的数据结构,可当作数组、字典、对象使用
  • 可存储任意类型值(数字、字符串、函数、甚至其他表)
  • 数字下标从 1 开始
  • 使用 #table 获取数组部分的长度(不包含字符串键值)

数组式用法

arr = {1"hello", {x=1}, function()print("func"end}table.insert(arr, "new")      -- 尾部插入table.remove(arr, 2)          -- 移除第2个元素print(#arr)                   -- 获取长度print(arr[1])                 -- 访问第一个元素

字典式用法(字符串下标)

dict = {    name = "Lua",    version = 5.4,    say = function()print("Hi"end}dict["extra"] = "some value"-- 等价于 dict.extra = "some value"print(dict.name)               -- "Lua"dict.say()                     -- 调用函数,输出 "Hi"

遍历 Table

for k, v inpairs(dict) doprint(k, v)end-- 仅遍历数组部分(连续数字下标)for i, v inipairs(arr) doprint(i, v)end

三、Function(函数)

定义函数

两种等价方式:

-- 方式一:直接定义functionadd(a, b)return a + bend-- 方式二:匿名函数赋值add = function(a, b)return a + bend

函数特性

  • 可以返回多个值
  • 调用时传入参数少于形参,缺少的参数为 nil
  • 调用时传入参数多于形参,多余参数被忽略
  • 无显式 return 时,返回 nil
functionmultiReturn()return1"two"trueendlocal a, b, c = multiReturn()print(a, b, c)  -- 1    two    true

四、布尔类型与逻辑运算

布尔值

  • 只有 true 和 false 两个值
  • 注意:在条件判断中,只有 false 和 nil 视为“假”,0 和空字符串均为真

逻辑运算符

  • and:逻辑与
  • or:逻辑或
  • not:逻辑非
  • 不等于使用 ~= 表示

三元运算模拟

Lua 中没有 ? : 三元运算符,但可用 and 和 or 模拟:

local result = (condition) and"yes"or"no"-- 相当于 condition ? "yes" : "no"

示例:

print(0and"yes"or"no")   -- "yes"(因为 0 为真)print(niland"yes"or"no"-- "no"

五、流程控制

条件判断

if score >= 90thenprint("优秀")elseif score >= 60thenprint("及格")elseprint("不及格")end

循环结构

for 循环

-- 数值 for:起始值, 结束值, 步长(默认为 1)for i = 110doprint(i)endfor i = 101-1doprint(i)end-- 注意:循环变量 i 在循环内部不可被修改

while 循环

local i = 1while i <= 5doprint(i)    i = i + 1-- Lua 没有 i++ 或 i += 1 语法end

repeat...until(类似 do-while)

local i = 1repeatprint(i)    i = i + 1until i > 5

六、全局表 _G

  • _G 是 Lua 的全局环境表,所有全局变量和函数都存储在其中
  • 可通过 _G["变量名"] 访问全局变量
  • 预定义函数(如 printtable.insert)也存放在 _G 中
a = 10print(_G["a"])                     -- 10print(_G["table"]["insert"])       -- function: 地址

七、字符串与字节操作

字符串与字节转换

local s = string.char(0x330x340x35)  -- 将 ASCII 码转为字符串 "345"print(string.byte(s, 1))           -- 取第一个字符的 ASCII 码:51(0x33)print(string.format("0x%02X"string.byte(s, 1)))  -- 格式化为十六进制:0x33

字符串长度

  • 使用 # 获取字符串字节数(对于 ASCII 字符串即字符数)
  • 对于多字节字符(如 UTF-8),需使用特定库获取正确字符数
print(#"hello")      -- 5print(#"中文")       -- 6(UTF-8 下每个中文占 3 字节)

八、注意事项与小技巧

  1. 数组下标从 1 开始:这是 Lua 的传统,许多内置函数(如 table.insert)都基于此。
  2. 小心全局变量:尽量使用 local 避免污染全局空间。
  3. 类型自动转换:字符串与数字在算术运算时会尝试自动转换,但显式转换更安全。
  4. table 长度陷阱:#table 只对连续数字下标的数组部分有效,对字典部分无效。
  5. 多重赋值:可用于交换变量值,如 x, y = y, x
  6. 函数多返回值:若函数调用不在赋值语句最后,则只返回第一个值。

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  1. CONNECT:[ UseTime:0.000511s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000540s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000282s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000296s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000474s ]
  6. SELECT * FROM `set` [ RunTime:0.000443s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000641s ]
  8. SELECT * FROM `article` WHERE `id` = 462558 LIMIT 1 [ RunTime:0.000733s ]
  9. UPDATE `article` SET `lasttime` = 1770749605 WHERE `id` = 462558 [ RunTime:0.007016s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000234s ]
  11. SELECT * FROM `article` WHERE `id` < 462558 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000429s ]
  12. SELECT * FROM `article` WHERE `id` > 462558 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002417s ]
  13. SELECT * FROM `article` WHERE `id` < 462558 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000992s ]
  14. SELECT * FROM `article` WHERE `id` < 462558 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007339s ]
  15. SELECT * FROM `article` WHERE `id` < 462558 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003840s ]
0.094765s