lua 实现tableToString

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function tableToString(studentNum)        local str =  "{ "      str = str.."\n"      for k, v in pairs(studentNum) do         if type(v) ~= "table" then             str = str.."[\""..k.."\"]"             str = str..":"             str = str..v             str = str..","             str = str.."\n"         else             str = str.."[\""..k.."\"]"             str = str..":"             str = str..tableToString(v)             str = str..","             str = str.."\n"         end      end      str = string.sub(str, 1, -3)      str = str.."\n"      str = str .." }"      return str     -- print("tableToString===", str) end   local studentNum = {1, {6, 7, {"hello", "world"}}, 5} local str = tableToString(studentNum) print(str)