如何发送参数？ 1)127.0.0.1:6379> HMSET myhash f1 helloword f2 99 f3 -256
OK
127.0.0.1:6379> HGETALL myhash
2) "f1"
3) "helloword"
4) "f2"
5) "99"
6) "f3"
7) "-256"
127.0.0.1:6379> HSTRLEN myhash f1
(error) ERR unknown command 'HSTRLEN'
127.0.0.1:6379>
[{'b':0,'c':1,'d':2},{'b':1,'c':2,'d':3},{'b':2,'c':3,'d':4}]