尝试对本地变量（一个布尔值）进行索引

这意味着当模块data.game_model被加载时，它没有返回任何东西。

在这种情况下，require返回true。

为了解决lhf的答案中指出的问题，您可以将表格保存和加载功能放置在由data.game_model返回的表格中，就像这样：

-- 存放路径: data/game_model.lua

local model = {}

local json = require("json")

function model.saveTable( t, filename )
    -- 存储代码
end

function model.loadTable( filename )
    -- 加载代码
end

return model

还请注意，常见的错误是将函数声明为model：saveTable（t，fn）而不是model.saveTable（t，fn）。记住，前者是model.saveTable（model，t，fn）的语法糖。

现在在local game = require("data.game_model")中，变量game应该被初始化为包含您的函数的表。您可以轻松地检查它：

local game = require("data.game_model")

print( type( game ) )
for k,v in pairs(game) do
    print(k,v)
end

将产生以下输出：

table
loadTable   function: 0x7f87925afa50
saveTable   function: 0x7f8794d73cf0

使用以下代码进行保存/加载。所有代码都来自 github/robmiracle。

local M = {}
local json = require("json")
local _defaultLocation = system.DocumentsDirectory
local _realDefaultLocation = _defaultLocation
local _validLocations = {
   [system.DocumentsDirectory] = true,
   [system.CachesDirectory] = true,
   [system.TemporaryDirectory] = true
}

function M.saveTable(t, filename, location)
    if location and (not _validLocations[location]) then
     error("尝试将表保存到无效位置", 2)
    elseif not location then
      location = _defaultLocation
    end

    local path = system.pathForFile( filename, location)
    local file = io.open(path, "w")
    if file then
        local contents = json.encode(t)
        file:write( contents )
        io.close( file )
        return true
    else
        return false
    end
end

function M.loadTable(filename, location)
    if location and (not _validLocations[location]) then
     error("尝试从无效位置加载表", 2)
    elseif not location then
      location = _defaultLocation
    end
    local path = system.pathForFile( filename, location)
    local contents = ""
    local myTable = {}
    local file = io.open( path, "r" )
    if file then
        -- read all contents of file into a string
        local contents = file:read( "*a" )
        myTable = json.decode(contents);
        io.close( file )
        return myTable
    end
    return nil
end

function M.changeDefault(location)
    if location and (not location) then
        error("尝试将默认位置更改为无效位置", 2)
    elseif not location then
        location = _realDefaultLocation
    end
    _defaultLocation = location
    return true
end

function M.print_r ( t )
    local print_r_cache={}
    local function sub_print_r(t,indent)
        if (print_r_cache[tostring(t)]) then
            print(indent.."*"..tostring(t))
        else
            print_r_cache[tostring(t)]=true
            if (type(t)=="table") then
                for pos,val in pairs(t) do
                    if (type(val)=="table") then
                        print(indent.."["..pos.."] => "..tostring(t).." {")
                        sub_print_r(val,indent..string.rep(" ",string.len(pos)+8))
                        print(indent..string.rep(" ",string.len(pos)+6).."}")
                    elseif (type(val)=="string") then
                        print(indent.."["..pos..'] => "'..val..'"')
                    else
                        print(indent.."["..pos.."] => "..tostring(val))
                    end
                end
            else
                print(indent..tostring(t))
            end
        end
    end
    if (type(t)=="table") then
        print(tostring(t).." {")
        sub_print_r(t,"  ")
        print("}")
    else
        sub_print_r(t,"  ")
    end
    print()
end

M.printTable = M.print_r

return M

用法

local loadsave = require("loadsave")

myTable = {}
myTable.musicOn = false
myTable.soundOn = true

loadsave.saveTable(myTable, "myTable.json")