Storage

The storage object provide the functions for storing key-value items in local persistent storage.

Please note that typically internal flash memory is used to store data items. As you know flash memory has finite number of write/erase cycles (less than tens of thousands), so please do not use this storage API for the jobs need frequently write/erase cycles.

Object: Storage

storage.length

<number>

Returns the number of data items in the storage.

storage.setItem('key1', 'value1');
storage.setItem('key2', 'value2');
console.log(storage.length); // 2

storage.getItem(key)

key <string>

Return the value associated with the given key.

storage.setItem('key1', 'value1');
var value1 = storage.getItem('key1');
var value2 = storage.getItem('key2'); // null
console.log(value); // "value1"

storage.setItem(key, value)

key <string>
value <string>

Add the key with the value to the storage.

storage.setItem('key1', 'value1');
var value1 = storage.getItem('key1'); // "value1"
storage.setItem('key1', 'new value');
value1 = storage.getItem('key1'); // "new value"

storage.removeItem(key)

key <string>

Remove the data item associated with the given key.

storage.setItem('key1', 'value1');
storage.removeItem('key1');
var value1 = storage.getItem('key1'); // null

storage.clear()

Remove all the data items in the storage.

storage.setItem('key1', 'value1');
storage.setItem('key2', 'value2');
storage.clear();
var value1 = storage.getItem('key1'); // null
var value2 = storage.getItem('ket2'); // null

storage.key(index)

index <number>
Returns: <string>

Returns the key string of the given index.

storage.setItem('key1', 'value1');
storage.setItem('key2', 'value2');
console.log(storage.length); // 2
console.log(storage.key(0)); // "key1"
console.log(storage.key(1)); // "key2"