node.js 查询数据库，每个关卡取三个排行

Question

  db.find({
    "table":"HeiKengTable",
    "limit":3,
    "order":"updatedAt",
    "keys":"playerName,level_HK, timeSdeltaTime_HK,updatedAt, weight_HK", 
    "where":{"createdAt":{"$lt":{"__type":"Date","iso":currentdate},"$gte":{"__type":"Date","iso":currentdat}},"level_HK":1
    },
  }

【"level_HK":1】取3个 【"level_HK":2】取三个
请问这样应该怎么查询呢？谢谢