incr|decr

incr(increment) 自增加1

127.0.0.1:6379> get test
"1"
127.0.0.1:6379> incr test
(integer) 2

decr(decrement) 减1

127.0.0.1:6379> get test
"1"
127.0.0.1:6379> decr test
(integer) 0

incrby(increment by) 增加指定数值

127.0.0.1:6379> get test
"2"
127.0.0.1:6379> incrby test 3
(integer) 5
127.0.0.1:6379> get test
"5"

decrby(decrement by) 减少指定数值

127.0.0.1:6379> get test
"5"
127.0.0.1:6379> decrby test 3
(integer) 2
127.0.0.1:6379> get test
"2"