zset是string类型的有序集合

zadd：向名称为key的zset中添加元素member，score用于排序。如果该元素存在，则更新其顺序。
127.0.0.1:6379> zadd myzset 1 one
(integer) 1
127.0.0.1:6379> zadd myzset 2 two
(integer) 1
127.0.0.1:6379> zadd myzset 3 two
(integer) 0
127.0.0.1:6379> zrange myzset 0 -1 withscores
1) "one"
2) "1"
3) "two"
4) "3"

zrem：删除名称为key的zset中的元素member。
127.0.0.1:6379> zrange myzset 0 -1 withscores
1) "one"
2) "1"
3) "two"
4) "3"
127.0.0.1:6379> zrem myzset two
(integer) 1
127.0.0.1:6379> zrange myzset 0 -1 withscores
1) "one"
2) "1"

zincrby：如果在名称为key的zset中已经存在元素member，则该元素的score增加increment，否则向该集合中添加该元素，其score的值为increment。
127.0.0.1:6379> zadd myzset2 1 one
(integer) 1
127.0.0.1:6379> zadd myzset2 2 two
(integer) 1
127.0.0.1:6379> zrange myzset2 0 -1 withscores
1) "one"
2) "1"
3) "two"
4) "2"
127.0.0.1:6379> zincrby myzset2 2 one
"3"
127.0.0.1:6379> zrange myzset2 0 -1 withscores
1) "two"
2) "2"
3) "one"
4) "3"

zrank：返回名称为key的zset中member元素的排名（按score从小到大排序）即下标。
127.0.0.1:6379> zadd myzset3 1 one
(integer) 1
127.0.0.1:6379> zadd myzset3 2 two
(integer) 1
127.0.0.1:6379> zadd myzset3 3 three
(integer) 1
127.0.0.1:6379> zadd myzset3 5 five
(integer) 1
127.0.0.1:6379> zrange myzset3 0 -1 withscores
1) "one"
2) "1"
3) "two"
4) "2"
5) "three"
6) "3"
7) "five"
8) "5"
127.0.0.1:6379> zrank myzset3 two
(integer) 1
127.0.0.1:6379> zrank myzset3 three
(integer) 2

zrevrank：返回名称为key的zset中member元素的排名（按score从大到小排序）即下标
127.0.0.1:6379> zrange myzset3 0 -1 withscores
1) "one"
2) "1"
3) "two"
4) "2"
5) "three"
6) "3"
7) "five"
8) "5"
127.0.0.1:6379> zrevrank myzset3 five
(integer) 0

zrevrange：
127.0.0.1:6379> zrange myzset3 0 -1 withscores
1) "one"
2) "1"
3) "two"
4) "2"
5) "three"
6) "3"
7) "five"
8) "5"
127.0.0.1:6379> zrevrange myzset3 0 -1 withscores
1) "five"
2) "5"
3) "three"
4) "3"
5) "two"
6) "2"
7) "one"
8) "1"


zrangebyscore：
127.0.0.1:6379> zrangebyscore myzset3 2 3 withscores
1) "two"
2) "2"
3) "three"
4) "3"

zcount：
127.0.0.1:6379> zrange myzset3 0 -1 withscores
1) "one"
2) "1"
3) "two"
4) "2"
5) "three"
6) "3"
7) "five"
8) "5"
127.0.0.1:6379> zcount myzset3 2 3
(integer) 2

zcard：
127.0.0.1:6379> zrange myzset3 0 -1 withscores
1) "one"
2) "1"
3) "two"
4) "2"
5) "three"
6) "3"
7) "five"
8) "5"
127.0.0.1:6379> zcard myzset3
(integer) 4

zremrangebyrank：删除集合中排名在给定区间的元素。
127.0.0.1:6379> zrange myzset3 0 -1 withscores
1) "one"
2) "1"
3) "two"
4) "2"
5) "three"
6) "3"
7) "five"
8) "5"
127.0.0.1:6379> zremrangebyrank myzset3 1 1
(integer) 1
127.0.0.1:6379> zrange myzset3 0 -1 withscores
1) "one"
2) "1"
3) "three"
4) "3"
5) "five"
6) "5"


zremrangbyscore：
127.0.0.1:6379> zrange myzset3 0 -1 withscores
1) "one"
2) "1"
3) "three"
4) "3"
5) "five"
6) "5"
127.0.0.1:6379> zremrangebyscore myzset3 4 5
(integer) 1
127.0.0.1:6379> zrange myzset3 0 -1 withscores
1) "one"
2) "1"
3) "three"
4) "3"
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