redis有序集合

### redis文档
http://redisdoc.com/

### zadd
127.0.0.1:6379> zadd score 20 zhuang 80 jun 60 biao 40 miao 100 shuai
(integer) 5
### zrange
127.0.0.1:6379> zrange score 0 -1
1) "zhuang"
2) "miao"
3) "biao"
4) "jun"
5) "shuai"
127.0.0.1:6379> zrange score 0 -1 withscores
 1) "zhuang"
 2) "20"
 3) "miao"
 4) "40"
 5) "biao"
 6) "60"
 7) "jun"
 8) "80"
 9) "shuai"
10) "100"
### zrank
127.0.0.1:6379> zrank score biao
(integer) 2
### zrevrange
127.0.0.1:6379> zrevrange score 0 -1
1) "shuai"
2) "jun"
3) "biao"
4) "miao"
5) "zhuang"
### zincrby
127.0.0.1:6379> zincrby score 50 biao
"110"
127.0.0.1:6379> zincrby score -50 biao
"60"