lua table转string

function serialize(obj)
    local lua = ""  
    local t = type(obj)  
    if t == "number" then  
        lua = lua .. obj  
    elseif t == "boolean" then  
        lua = lua .. tostring(obj)  
    elseif t == "string" then  
        lua = lua .. string.format("%q", obj)  
    elseif t == "table" then  
        lua = lua .. "{"  
        for k, v in pairs(obj) do  
            lua = lua .. "[" .. serialize(k) .. "]=" .. serialize(v) .. ","  
        end  
        local metatable = getmetatable(obj)  
        if metatable ~= nil and type(metatable.__index) == "table" then  
            for k, v in pairs(metatable.__index) do  
                lua = lua .. "[" .. serialize(k) .. "]=" .. serialize(v) .. ","  
            end  
        end  
        lua = lua .. "}"  
    elseif t == "nil" then  
        return nil  
    else  
        error("can not serialize a " .. t .. " type.")  
    end  
    return lua  
end

function table2string(tablevalue)
    local stringtable = serialize(tablevalue)
    print(stringtable)
    return stringtable
end

local data = {["a"] = "a", ["b"] = "b", [1] = 1, [2] = 2, ["t"] = {1, 2, 3}} 
local string = table2string(data)

输出：
{["a"]="a",[2]=2,["b"]="b",[1]=1,["t"]={[1]=1,[2]=2,[3]=3,},}