我的MongoDB文档如下所示：{StatCode:"...",LoadTime:"..."}例如，数据可能如下所示：+-----+----------+------------+|_id|StatCode|LoadTime|+-----+----------+------------+|1|200|0,345||2|200|0,234||3|200|0,396||4|200|1,234||5|200|2,564||6|200|0,437||7|301|0,523||8|301|0,628||9|301|0,712||10|200|1,784|+-----+----------+---