“$in”：在范围之中
"$nin"：不再范围之中

范例：查询姓名为“赵一”、“王八”的信息
> db.emp.find({"name":{"$in":["赵一","王八"]}}).pretty();
{
        "_id" : ObjectId("599108423268c8e84253be26"),
        "name" : "赵一",
        "sex" : "男",
        "age" : 30,
        "sal" : 1000,
        "loc" : "北京"
}
{
        "_id" : ObjectId("599108433268c8e84253be2d"),
        "name" : "王八",
        "sex" : "男",
        "age" : 35,
        "sal" : 8000,
        "loc" : "北京"
}

范例：查询姓名不是“赵一”、“王八”的信息
> db.emp.find({"name":{"$nin":["赵一","王八"]}}).pretty();
{
        "_id" : ObjectId("599108423268c8e84253be27"),
        "name" : "钱二",
        "sex" : "女",
        "age" : 22,
        "sal" : 5000,
        "loc" : "上海"
}
{
        "_id" : ObjectId("599108423268c8e84253be28"),
        "name" : "孙三",
        "sex" : "男",
        "age" : 40,
        "sal" : 2000,
        "loc" : "深圳"
}
{
        "_id" : ObjectId("599108423268c8e84253be29"),
        "name" : "李四",
        "sex" : "女",
        "age" : 30,
        "sal" : 7000,
        "loc" : "北京"
}
{
        "_id" : ObjectId("599108423268c8e84253be2a"),
        "name" : "周五",
        "sex" : "女",
        "age" : 30,
        "sal" : 6400,
        "loc" : "北京"
}
{
        "_id" : ObjectId("599108423268c8e84253be2b"),
        "name" : "吴六",
        "sex" : "男",
        "age" : 30,
        "sal" : 2500,
        "loc" : "重庆"
}
{
        "_id" : ObjectId("599108423268c8e84253be2c"),
        "name" : "郑七",
        "sex" : "女",
        "age" : 50,
        "sal" : 4700,
        "loc" : "成都"
}

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