nsIDOMStorage2 编辑

The nsIDOMStorage2 interface represents the storage space used for local storage in the DOM.  Items stored in local storage may only be accessed by the same origin that created the items in the first place.

A DOM window's local storage object can be retrieved from the window's localStorage attribute.

Inherits from: nsISupports

Method overview

 Attributes

Methods

clear()

Clears the contents of this storage context; this removes all values bound to the domain or origin.

void clear();

Parameters

None.

getItem()

Returns from local storage the data corresponding to the specified key.

DOMString getItem(
  in DOMString key
);

Parameters

key

The key for which data should be returned.

Return value

A string containing the data corresponding to the specified key, or null if no data exists for the given key.

key()

Returns the key for the item stored at the specified index in the data store.

DOMString key(
  in unsigned long index
);

Parameters

index

The index for which the corresponding key should be returned.

Return value

A string containing the requested key.

Exceptions thrown

INDEX_SIZE_ERR

There is no key at the specified index.

removeItem()

Given a key, removes the corresponding entry from local storage.

void removeItem(
  in DOMString key
);

Parameters

key

The key for which data should be removed from storage.

setItem()

Sets the value corresponding to a given key.  If the key does not already exist, a new key is added, associated with the specified value.  If the key already exists, the existing value is replaced with the specified value.

void setItem(
  in DOMString key,
  in DOMString data
);

Parameters

key

The key for which data should be set.

data

The data to associate with the specified key.

See also

• DOM Storage
• Structured client-side storage (HTML 5 specification)
• nsIDOMStorageItem