在lua中遍历目录文件需要用到lfs库，而所用的cocos2dx 3.10没用lfs，需要自己添加

1、下载lfs.c和lfs.h

https://github.com/keplerproject/luafilesystem

从github获取源码，在src目录拷贝lfs.c和lfs.h到cocos2d项目下cocos2d\external\lua\luafilesystem（luafilesystem为自己新建的文件夹）

2、在VS解决方案libluacocos2d项目下添加luafilesystem文件夹筛选器并承载lfs.c和lfs.h

3、修改lua_extensions.c文件

lua_extensions.c文件在cocos2d\cocos\scripting\lua-bindings\manual\network\目录下

新增如下两行代码

#include "luafilesystem/lfs.h"
和
{"lfs", luaopen_lfs},

代码位置如下：

#include "lua_extensions.h"
#if __cplusplus
extern "C" {
#endif
// socket
#include "luasocket/luasocket.h"
#include "luasocket/luasocket_scripts.h"
#include "luasocket/mime.h"
#include "luafilesystem/lfs.h"
static luaL_Reg luax_exts[] = {
    {"socket.core", luaopen_socket_core},
    {"mime.core", luaopen_mime_core},
        {"lfs", luaopen_lfs},
    {NULL, NULL}
};
...

4、发布到安卓要修改Android.mk

在cocos2d\cocos\scripting\lua-bindings\proj.android目录下修改Android.mk

新增一行lfs.c路径

../../../../external/lua/luafilesystem/lfs.c

#network
LOCAL_SRC_FILES += ../manual/network/lua_cocos2dx_network_manual.cpp \
                   ../manual/network/lua_extensions.c \
                   ../manual/network/Lua_web_socket.cpp \
                   ../manual/network/lua_xml_http_request.cpp \
                   ../../../../external/lua/luasocket/auxiliar.c \
                   ../../../../external/lua/luasocket/buffer.c \
                   ../../../../external/lua/luasocket/except.c \
                   ../../../../external/lua/luasocket/inet.c \
                   ../../../../external/lua/luasocket/io.c \
                   ../../../../external/lua/luasocket/luasocket.c \
                   ../../../../external/lua/luasocket/luasocket_scripts.c \
                   ../../../../external/lua/luasocket/mime.c \
                   ../../../../external/lua/luasocket/options.c \
                   ../../../../external/lua/luasocket/select.c \
                   ../../../../external/lua/luasocket/serial.c \
                   ../../../../external/lua/luasocket/tcp.c \
                   ../../../../external/lua/luasocket/timeout.c \
                   ../../../../external/lua/luasocket/udp.c \
                   ../../../../external/lua/luasocket/unix.c \
                   ../../../../external/lua/luasocket/usocket.c \
                             ../../../../external/lua/luafilesystem/lfs.c

5、lua遍历文件范例（删除指定目录）

require "lfs"
local function removeDir(path)
    print("os.rmdir:", path)
    if cc.FileUtils:getInstance():isDirectoryExist(path) then
        local function _rmdir(path)
            local iter, dir_obj = lfs.dir(path)
            while true do
                local dir = iter(dir_obj)
                if dir == nil then break end
                if dir ~= "." and dir ~= ".." then
                    local curDir = path..dir
                    local mode = lfs.attributes(curDir, "mode")
                    if mode == "directory" then
                        _rmdir(curDir.."/")
                    elseif mode == "file" then
                        cc.FileUtils:getInstance():removeFile(curDir)
                    end
                end
            end
            local succ, des = cc.FileUtils:getInstance():removeDirectory(path)
            if des then print(des) end
            return succ
        end
        _rmdir(path)
    end
    return true
end