散列表（Hash table，也叫哈希表），是根据关键码值(Key value)而直接进行访问的数据结构。也就是说，它通过把关键码值映射到表中一个位置来访问记录，以加快查找的速度。这个映射函数叫做散列函数，存放记录的数组叫做散列表。(A hash table (Hash table, also called hash table) is a data structure that accesses directly according to the key code value (Key value). That is to say, it accesses the record by mapping key code values to a location in the table to speed up the search. This mapping function is called a hash function, and an array of records is called a hash table.)