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Showing content from https://webplatform.github.io/docs/apis/web-storage/Storage/key below:

key · WebPlatform Docs

Returns the name of the nth key in the list.

Method of apis/web-storage/Storageapis/web-storage/Storage

var  = object.key(index);

Data-type

unsigned long

A zero-based index of the list entry, up to the length of the collection.

Returns an object of type StringString

This example creates a new localStorage item (a timestamp) and sets it with a unique key, then executes a function, then retrieves the item’s name by its key index (0 in this case, as it is the first key) and reports its value.

window.localStorage.setItem('timestamp', (new Date()).getTime());
doSomethingElse();
startTimeKey = window.localStorage.key(0);
startTime = window.localStorage.getItem(startTimeKey);
alert("The doSomethingElse function was called at: " + startTime);

The returned key can be any string, including the empty string. The order of keys may change when items are added to the collection. This method will throw an “Invalid Argument” exception if index is out of range.

W3C Web Storage Specification

W3C Editor’s Draft

• Microsoft Developer Network: Windows Internet Explorer API reference Article

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