Storage.key() - Web APIs 编辑

The key() method of the Storage interface, when passed a number n, returns the name of the nth key in a given Storage object. The order of keys is user-agent defined, so you should not rely on it.

Syntax

var aKeyName = storage.key(index);

Parameters

index

An integer representing the number of the key you want to get the name of. This is a zero-based index.

Return value

A DOMString containing the name of the key. If the index does not exist, null is returned.

Examples

The following function iterates over the local storage keys:

function forEachKey(callback) {
  for (var i = 0; i < localStorage.length; i++) {
    callback(localStorage.key(i));
  }
}

The following function iterates over the local storage keys and gets the value set for each key:

for(var i =0; i < localStorage.length; i++){
  console.log(localStorage.getItem(localStorage.key(i)));
}

Note: For a real world example, see our Web Storage Demo.

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• Using the Web Storage API