hmget(hash multiple get) 获取一个key的多个字段的数据

127.0.0.1:6379> keys *
1) "user:1"
127.0.0.1:6379> hkeys user:1
1) "name"
2) "age"
3) "sex"
127.0.0.1:6379> hmget user:1 name age
1) "youyi"
2) "20"