javascript--array-Associative (hash) array

The principle of associative (hash) arrays:

Hash algorithm: Receive a string to calculate a number that is not duplicated as much as possible
Different strings, calculate the number as different as possible
The same string, the calculated ordinal must be the same
When depositing data: The custom subscript name is given to the hash algorithm to calculate a sequence number that is as distinct as possible. The data to be saved is stored in the corresponding position of the serial number.
When the data is obtained: the subscript name to be searched is given to the hash algorithm, and then the exact sequence number is calculated and stored, and the element content is obtained directly from the array.
Pros: Find extremely fast, independent of data volume and storage location!

javascript--array-Associative (hash) array