（三）Redis——SortedSet

感觉这个set有点像hash啊……

127.0.0.1:6379> ZADD sortedset 680 a 660 b 650 c 640 d
(integer) 4
127.0.0.1:6379> ZRANGE sortedset 0 -1
1) "d"
2) "c"
3) "b"
4) "a"
127.0.0.1:6379> ZRANGE sortedset 0 -1 withscores
1) "d"
2) "640"
3) "c"
4) "650"
5) "b"
6) "660"
7) "a"
8) "680"
127.0.0.1:6379> ZSCORES sortedset a
(error) ERR unknown command 'ZSCORES'
127.0.0.1:6379> ZSCORE sortedset a
"680"
127.0.0.1:6379> ZRANK sortedset a
(integer) 3
127.0.0.1:6379> ZREVRANK sortedset a
(integer) 0
127.0.0.1:6379> ZREM sortedset a
(integer) 1