Returns if field is an existing field in the hash stored at key.
返回值
Integer reply, specifically:
1if the hash containsfield.0if the hash does not containfield, orkeydoes not exist.
例子
redis>
HSET myhash field1 "foo"
(integer) 1redis> HEXISTS myhash field1
(integer) 1redis> HEXISTS myhash field2
(integer) 0