'，_ = '_'},[],[{{'','P2 = [{#goods{id = '$2',upgrade='$1'，_ = '_'},[],[{{'$2','$1'}}]}]
'}}]}]P2 = [{#goods{id = '',upgrade='P2 = [{#goods{id = '$2',upgrade='$1'，_ = '_'},[],[{{'$2','$1'}}]}]
'，_ = '_'},[],[
阅读背景：
ets查询：查询表中的具体一列的所有值
来源：互联网
'，_ = '_'},[],[{{'','P2 = [{#goods{id = '$2',upgrade='$1'，_ = '_'},[],[{{'$2','$1'}}]}]
'}}]}]P2 = [{#goods{id = '',upgrade='P2 = [{#goods{id = '$2',upgrade='$1'，_ = '_'},[],[{{'$2','$1'}}]}]
'，_ = '_'},[],[
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