deepcopy = function(object)

    local lookup_table = {}

    local function _copy(object)

        if type(object) ~= "table" then

            return object

        elseif lookup_table[object] then

            return lookup_table[object]

        end

        local new_table = {}

        lookup_table[object] = new_table

        for index, value in pairs(object) do

            new_table[_copy(index)] = _copy(value)

        end

        return setmetatable(new_table, getmetatable(object))

    end

    return _copy(object)

end

local testA =  {,,,,}

local testB = testA

testB[] = "我擦"

local testC = deepcopy(testA)

testC[] = "我勒个去"

for k , v  in ipairs (testA) do

    print("testA",k, v )

end

print("============================")

for k , v  in ipairs (testC) do

    print("testC",k, v )

end