- 1 - 介绍
- 2.1 - 语法约定
- 2.10.1 - 垃圾收集的元方法
- 2.10.2 - Weak Table（弱表）
- 2.10 - 垃圾收集
- 2.11 - Coroutine （协同例程）
- 2.2.1 - 强制转换
- 2.2 - 值与类型
- 2.3 - 变量
- 2.4.1 - Chunk（语句组）
- 2.4.2 - 语句块
- 2.4.3 - 赋值
- 2.4.4 - 控制结构
- 2.4.5 - For 语句
- 2.4.6 - 把函数调用作为语句段
- 2.4.7 - 局部变量声名
- 2.4 - 语句段（Statement）
- 2.5.1 - 数学运算操作符
- 2.5.2 - 比较操作符
- 2.5.3 - 逻辑操作符
- 2.5.4 - 连接符
- 2.5.5 - 取长度操作符
- 2.5.6 - 优先级
- 2.5.7 - Table 构造
- 2.5.8 - 函数调用
- 2.5.9 - 函数定义
- 2.5 - 表达式
- 2.6 - 可视规则
- 2.7 - 错误处理
- 2.8 - Metatable（元表）
- 2.9 - 环境
- 2 - 语言
- 3.1 - 堆栈
- 3.2 - 堆栈尺寸
- 3.3 - 伪索引
- 3.4 - C Closure
- 3.5 - 注册表
- 3.6 - C 中的错误处理
- 3.7 - 函数和类型
- 3.8 - 调试接口
- 3 - 程序接口（API）
- 4.1 - Functions and Types
- 4 - The Auxiliary Library
- 5.1 - Basic Functions
- 5.2 - Coroutine Manipulation
- 5.3 - Modules
- 5.4 - String Manipulation
- 5.5 - Table Manipulation
- 5.6 - Mathematical Functions
- 5.7 - Input and Output Facilities
- 5.8 - Operating System Facilities
- 5.9 - The Debug Library
- 5 - Standard Libraries
- 6 - Lua Stand-alone
- 7.1 - Changes in the Language
- 7.2 - Changes in the Libraries
- 7.3 - Changes in the API
- 7 - Incompatibilities with the Previous Version
- 8 - The Complete Syntax of Lua
- Captures
- Character Class:
- luaL_addchar
- luaL_addlstring
- luaL_addsize
- luaL_addstring
- luaL_addvalue
- luaL_argcheck
- luaL_argerror
- luaL_Buffer
- luaL_buffinit
- luaL_callmeta
- luaL_checkany
- luaL_checkint
- luaL_checkinteger
- luaL_checklong
- luaL_checklstring
- luaL_checknumber
- luaL_checkoption
- luaL_checkstack
- luaL_checkstring
- luaL_checktype
- luaL_checkudata
- luaL_dofile
- luaL_dostring
- luaL_error
- luaL_getmetafield
- luaL_getmetatable
- luaL_gsub
- luaL_loadbuffer
- luaL_loadfile
- luaL_loadstring
- luaL_newmetatable
- luaL_newstate
- luaL_openlibs
- luaL_optint
- luaL_optinteger
- luaL_optlong
- luaL_optlstring
- luaL_optnumber
- luaL_optstring
- luaL_prepbuffer
- luaL_pushresult
- luaL_ref
- luaL_Reg
- luaL_register
- luaL_typename
- luaL_typerror
- luaL_unref
- luaL_where
- lua_Alloc
- lua_atpanic
- lua_call
- lua_CFunction
- lua_checkstack
- lua_close
- lua_concat
- lua_cpcall
- lua_createtable
- lua_Debug
- lua_dump
- lua_equal
- lua_error
- lua_gc
- lua_getallocf
- lua_getfenv
- lua_getfield
- lua_getglobal
- lua_gethook
- lua_gethookcount
- lua_gethookmask
- lua_getinfo
- lua_getlocal
- lua_getmetatable
- lua_getstack
- lua_gettable
- lua_gettop
- lua_getupvalue
- lua_Hook
- lua_insert
- lua_Integer
- lua_isboolean
- lua_iscfunction
- lua_isfunction
- lua_islightuserdata
- lua_isnil
- lua_isnumber
- lua_isstring
- lua_istable
- lua_isthread
- lua_isuserdata
- lua_lessthan
- lua_load
- lua_newstate
- lua_newtable
- lua_newthread
- lua_newuserdata
- lua_next
- lua_Number
- lua_objlen
- lua_pcall
- lua_pop
- lua_pushboolean
- lua_pushcclosure
- lua_pushcfunction
- lua_pushfstring
- lua_pushinteger
- lua_pushlightuserdata
- lua_pushlstring
- lua_pushnil
- lua_pushnumber
- lua_pushstring
- lua_pushthread
- lua_pushvalue
- lua_pushvfstring
- lua_rawequal
- lua_rawget
- lua_rawgeti
- lua_rawset
- lua_rawseti
- lua_Reader
- lua_register
- lua_remove
- lua_replace
- lua_resume
- lua_setallocf
- lua_setfenv
- lua_setfield
- lua_setglobal
- lua_sethook
- lua_setlocal
- lua_setmetatable
- lua_settable
- lua_settop
- lua_setupvalue
- lua_State
- lua_status
- lua_toboolean
- lua_tocfunction
- lua_tointeger
- lua_tolstring
- lua_tonumber
- lua_topointer
- lua_tostring
- lua_tothread
- lua_touserdata
- lua_type
- lua_typename
- lua_Writer
- lua_xmove
- lua_yield
- Pattern:
- Pattern Item:
- assert (v [, message])
- collectgarbage (opt [, arg])
- coroutine.create (f)
- coroutine.resume (co [, val1, ···])
- coroutine.running ()
- coroutine.status (co)
- coroutine.wrap (f)
- coroutine.yield (···)
- debug.debug ()
- debug.getfenv (o)
- debug.gethook ([thread])
- debug.getinfo ([thread,] function [, what])
- debug.getlocal ([thread,] level, local)
- debug.getmetatable (object)
- debug.getregistry ()
- debug.getupvalue (func, up)
- debug.setfenv (object, table)
- debug.sethook ([thread,] hook, mask [, count])
- debug.setlocal ([thread,] level, local, value)
- debug.setmetatable (object, table)
- debug.setupvalue (func, up, value)
- debug.traceback ([thread,] [message])
- dofile (filename)
- error (message [, level])
- getfenv (f)
- getmetatable (object)
- io.close ([file])
- io.flush ()
- io.input ([file])
- io.lines ([filename])
- io.open (filename [, mode])
- io.output ([file])
- io.popen ([prog [, mode]])
- io.read (···)
- io.tmpfile ()
- io.type (obj)
- io.write (···)
- ipairs (t)
- load (func [, chunkname])
- loadfile ([filename])
- loadstring (string [, chunkname])
- math.abs (x)
- math.acos (x)
- math.asin (x)
- math.atan (x)
- math.atan2 (x, y)
- math.ceil (x)
- math.cos (x)
- math.cosh (x)
- math.deg (x)
- math.exp (x)
- math.floor (x)
- math.fmod (x, y)
- math.frexp (x)
- math.huge
- math.ldexp (m, e)
- math.log (x)
- math.log10 (x)
- math.max (x, ···)
- math.min (x, ···)
- math.modf (x)
- math.pi
- math.pow (x, y)
- math.rad (x)
- math.random ([m [, n]])
- math.randomseed (x)
- math.sin (x)
- math.sinh (x)
- math.sqrt (x)
- math.tan (x)
- math.tanh (x)
- module (name [, ···])
- next (table [, index])
- os.clock ()
- os.date ([format [, time]])
- os.difftime (t2, t1)
- os.execute ([command])
- os.exit ([code])
- os.getenv (varname)
- os.remove (filename)
- os.rename (oldname, newname)
- os.setlocale (locale [, category])
- os.time ([table])
- os.tmpname ()
- package.cpath
- package.loaded
- package.loadlib (libname, funcname)
- package.path
- package.preload
- package.seeall (module)
- pairs (t)
- pcall (f, arg1, ···)
- print (···)
- rawequal (v1, v2)
- rawget (table, index)
- rawset (table, index, value)
- require (modname)
- select (index, ···)
- setfenv (f, table)
- setmetatable (table, metatable)
- string.byte (s [, i [, j]])
- string.char (···)
- string.dump (function)
- string.find (s, pattern [, init [, plain]])
- string.format (formatstring, ···)
- string.gmatch (s, pattern)
- string.gsub (s, pattern, repl [, n])
- string.len (s)
- string.lower (s)
- string.match (s, pattern [, init])
- string.rep (s, n)
- string.reverse (s)
- string.sub (s, i [, j])
- string.upper (s)
- table.concat (table [, sep [, i [, j]]])
- table.insert (table, [pos,] value)
- table.maxn (table)
- table.remove (table [, pos])
- table.sort (table [, comp])
- tonumber (e [, base])
- tostring (e)
- type (v)
- unpack (list [, i [, j]])
- xpcall (f, err)
- _G
- _VERSION
- file:close ()
- file:flush ()
- file:lines ()
- file:read (...)
- file:seek ([whence] [, offset])
- file:setvbuf (mode [, size])
- file:write (...)
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lua_tonumber
lua_Number lua_tonumber (lua_State *L, int index);
Converts the Lua value at the given acceptable index to a number (see lua_Number). The Lua value must be a number or a string convertible to a number (see §2.2.1); otherwise, lua_tonumber returns 0.
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