`RPOP`

Pop one or more elements from the tail of a list.

语法	`RPOP key [count]`
分组	list
参数个数	-2
起始版本	1.0.0
标志	write
复杂度	O(C) elements popped
Redis 兼容性	differs: RPOP key 0 on an existing key replies a nil array where Redis replies an empty array