redis的list类型，可以存储双向链表作为value，key保留有head和tail指针可以指向双向链表的头和尾，因此可以直接从头或尾对list进行操作。 全部命令如下：
127.0.0.1:6379> help @listBLMOVE source destination LEFT|RIGHT LEFT|RIGHT timeoutsummary: Pop an element from a list, push it to another list and return it; or block until one is availablesince: 6.2.0BLMPOP timeout numkeys key [key ...] LEFT|RIGHT [COUNT count]summary: Pop elements from a list, or block until one is availablesince: 7.0.0BLPOP key [key ...] timeoutsummary: Remove and get the first element in a list, or block until one is availablesince: 2.0.0BRPOP key [key ...] timeoutsummary: Remove and get the last element in a list, or block until one is availablesince: 2.0.0BRPOPLPUSH source destination timeoutsummary: Pop an element from a list, push it to another list and return it; or block until one is availablesince: 2.2.0LINDEX key indexsummary: Get an element from a list by its indexsince: 1.0.0LINSERT key BEFORE|AFTER pivot elementsummary: Insert an element before or after another element in a listsince: 2.2.0LLEN keysummary: Get the length of a listsince: 1.0.0LMOVE source destination LEFT|RIGHT LEFT|RIGHTsummary: Pop an element from a list, push it to another list and return itsince: 6.2.0LMPOP numkeys key [key ...] LEFT|RIGHT [COUNT count]summary: Pop elements from a listsince: 7.0.0LPOP key [count]summary: Remove and get the first elements in a listsince: 1.0.0LPOS key element [RANK rank] [COUNT num-matches] [MAXLEN len]summary: Return the index of matching elements on a listsince: 6.0.6LPUSH key element [element ...]summary: Prepend one or multiple elements to a listsince: 1.0.0LPUSHX key element [element ...]summary: Prepend an element to a list, only if the list existssince: 2.2.0LRANGE key start stopsummary: Get a range of elements from a listsince: 1.0.0LREM key count elementsummary: Remove elements from a listsince: 1.0.0LSET key index elementsummary: Set the value of an element in a list by its indexsince: 1.0.0LTRIM key start stopsummary: Trim a list to the specified rangesince: 1.0.0RPOP key [count]summary: Remove and get the last elements in a listsince: 1.0.0RPOPLPUSH source destinationsummary: Remove the last element in a list, prepend it to another list and return itsince: 1.2.0RPUSH key element [element ...]summary: Append one or multiple elements to a listsince: 1.0.0RPUSHX key element [element ...]summary: Append an element to a list, only if the list existssince: 2.2.0下面示例如下：
lpush：lpush key e1 e2 e3…将数据从头那里推入list lpop：lpop key，将数据从head弹出 这样2个同向的命令组合起来，可以实现一个队列。 反向的命令组合起来，可以实现一个栈。
127.0.0.1:6379> lpush k1 a b c d e(integer) 5127.0.0.1:6379> lpop k1"e"127.0.0.1:6379> lpop k1"d"lrange ：lrange key start end，展示key对应的从下标start到end的所有数据
127.0.0.1:6379> lrange k1 0 -11) "c"2) "b"3) "a"lindex：lindex key index ，返回key对应的List指定index位置的值
127.0.0.1:6379> lrange k1 0 -11) "f"2) "e"3) "d"4) "c"5) "b"6) "a"127.0.0.1:6379> lindex k1 1"e"lset：lset key index value，在key对应的list中的指定下标处替换为value
127.0.0.1:6379> lset k1 3 xOK127.0.0.1:6379> lrange k1 0 -11) "f"2) "e"3) "d"4) "x"5) "b"6) "a"lrem：lrem key num target，删除key对应的list中的target元素，如果num大于0，从head开始删num个。如果num小于0，从tail开始删abs(num)个
127.0.0.1:6379> lrange k3 0 -11) "d"2) "6"3) "a"4) "5"5) "c"6) "4"7) "a"8) "3"9) "b"10) "2"11) "a"12) "1"127.0.0.1:6379> lrem k3 2 a(integer) 2127.0.0.1:6379> lrange k3 0 -11) "d"2) "6"3) "5"4) "c"5) "4"6) "3"7) "b"8) "2"9) "a"10) "1"linsert：linsert key before/after element value，在key对应的list中，在元素element（不是下标）之前或者之后，添加value
127.0.0.1:6379> lrange k3 0 -11) "d"2) "6"3) "5"4) "c"5) "4"6) "3"7) "b"8) "2"9) "a"10) "1"127.0.0.1:6379> linsert k3 after 6 a(integer) 11127.0.0.1:6379> lrange k3 0 -11) "d"2) "6"3) "a"4) "5"5) "c"6) "4"7) "3"8) "b"9) "2"10) "a"11) "1"llen：llen key，返回长度 redis的List类型有很多关于下标的操作，也可以将其抽象为一个数组来使用。
127.0.0.1:6379> llen k3(integer) 10blpop：blpop key time，弹出指定key对应的list中的一个元素，如果list没有元素或者不存在key对应的这个list，则阻塞等待time指定的时间，0表示一直等待，单位是s。
127.0.0.1:6379> blpop k1 0阻塞期间如果list有了元素，则会中断阻塞并弹出
127.0.0.1:6379> blpop k1 01) "k1"2) "a"(35.77s)ltrim：ltrim key start end，删除key对应的list start和end之外的两端的元素
127.0.0.1:6379> lrange k4 0 -11) "f"2) "e"3) "d"4) "c"5) "b"6) "a"127.0.0.1:6379> ltrim k4 1 -2OK127.0.0.1:6379> lrange k4 0 -11) "e"2) "d"3) "c"4) "b"
