数据结构如下/* 6 */{ "_id" : ObjectId("591e91ea0fde9f017a9d6e9d"), "app" : "啦啦啦啦", "date" : "2017-05-19", "uid" : 10002, "nickName" : "qwe", "count" : 2, "card" : 2}/* 7 */{ "_id" : ObjectId("591ea6950fde9f017a9d7a13"), "app" : "呵呵呵", "date" : "2017-05-19", "uid" : 10003, "nickName" : "asd", "count" : 2, "card" : 2}数据量已超数十万尝试建立索引并没有得到预想的结果,反而更慢求方案,在线等
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