The length
read-only property of the Storage
interface returns the number of data items stored in a given Storage
object.
The length
read-only property of the Storage
interface returns the number of data items stored in a given Storage
object.
The number of items stored in the Storage
object.
The following function adds three data items to the local storage for the current domain, then returns the number of items in the storage:
js
function populateStorage() { localStorage.setItem("bgcolor", "yellow"); localStorage.setItem("font", "Helvetica"); localStorage.setItem("image", "cats.png"); return localStorage.length; // Should return 3 }
Note: For a real-world example, see our Web Storage Demo.
Specification |
---|
HTML Standard # dom-storage-length-dev |
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
length |
4 | 12 | 3.5 | 8 | 10.5 | 4 | ≤37 | 18 | 6 | 11 | 3.2 | 1.0 |
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https://developer.mozilla.org/en-US/docs/Web/API/Storage/length