Navigator 介面標示了用戶代理(user agent)的狀態與身份。它允許腳本查詢與註冊,以進行一些活動。

Navigator 可以被檢索,只要使用唯讀的 window.navigator 屬性。


它並不繼承任何屬性,但其實做已被定義於 NavigatorID (en-US)NavigatorLanguage (en-US)NavigatorOnLineNavigatorContentUtilsNavigatorStorage (en-US)NavigatorStorageUtilsNavigatorConcurrentHardware (en-US)NavigatorPlugins (en-US)NavigatorUserMedia.


Navigator.activeVRDisplays (en-US) Read only
Returns an array containing every VRDisplay (en-US) object that is currently presenting (VRDisplay.ispresenting (en-US) is true).
NavigatorID.appCodeName (en-US) Read only
Returns the internal "code" name of the current browser. Do not rely on this property to return the correct value.
NavigatorID.appName (en-US) Read only
Returns a DOMString with the official name of the browser. Do not rely on this property to return the correct value.
NavigatorID.appVersion (en-US) Read only
Returns the version of the browser as a DOMString. Do not rely on this property to return the correct value.
Navigator.battery (en-US) Read only
Returns a BatteryManager (en-US) object you can use to get information about the battery charging status.
Navigator.connection (en-US) Read only
Provides a NetworkInformation (en-US) object containing information about the network connection of a device.
Navigator.cookieEnabled (en-US) Read only
Returns false if setting a cookie will be ignored and true otherwise.
Navigator.geolocation Read only
Returns a Geolocation object allowing accessing the location of the device.
NavigatorConcurrentHardware.hardwareConcurrency (en-US) Read only
Returns the number of logical processor cores available.
NavigatorPlugins.javaEnabled (en-US) Read only
Returns a Boolean (en-US) flag indicating whether the host browser is Java-enabled or not.
NavigatorLanguage.language Read only
Returns a DOMString representing the preferred language of the user, usually the language of the browser UI. The null value is returned when this is unknown.
NavigatorLanguage.languages (en-US) Read only
Returns an array of DOMString representing the languages known to the user, by order of preference.
NavigatorPlugins.mimeTypes (en-US) Read only
Returns an MimeTypeArray (en-US) listing the MIME types supported by the browser.
NavigatorOnLine.onLine (en-US) Read only
Returns a Boolean (en-US) indicating whether the browser is working online.
Navigator.oscpu (en-US)
Returns a string that represents the current operating system.
Navigator.permissions (en-US) Read only
Returns a Permissions (en-US) object that can be used to query and update permission status of APIs covered by the Permissions API.
NavigatorID.platform (en-US) Read only
Returns a string representing the platform of the browser. Do not rely on this function to return a significant value.
NavigatorPlugins.plugins (en-US) Read only
Returns a PluginArray (en-US) listing the plugins installed in the browser.
NavigatorID.product (en-US) Read only
Always returns 'Gecko', on any browser. This property is kept only for compatibility purpose.
Navigator.serviceWorker (en-US) Read only
Returns a ServiceWorkerContainer (en-US) object, which provides access to registration, removal, upgrade, and communication with the ServiceWorker (en-US) objects for the associated document. (en-US) Read only
Returns the singleton StorageManager (en-US) object used for managing persistance permissions and estimating available storage on a site-by-site/app-by-app basis.
NavigatorID.userAgent (en-US) Read only
Returns the user agent string for the current browser.


Firefox OS devices adds more non-standard properties. You can consult them on the Firefox OS Navigator extensions article.

Navigator.buildID (en-US)
Returns the build identifier of the browser (e.g., "2006090803").
Navigator.cookieEnabled (en-US)
Returns a boolean indicating whether cookies are enabled in the browser or not.
Navigator.credentials (en-US)
Returns the CredentialsContainer (en-US) interface which exposes methods to request credentials and notify the user agent when interesting events occur such as successful sign in or sign out. 
Navigator.doNotTrack (en-US)
Reports the value of the user's do-not-track preference. When this value is "yes", your web site or application should not track the user.
Returns the id object which you can use to add support for BrowserID to your web site.
Navigator.mediaDevices (en-US) 
Returns a reference to a MediaDevices (en-US) object which can then be used to get information about available media devices (MediaDevices.enumerateDevices() (en-US)), find out what constrainable properties are supported for media on the user's computer and user agent (MediaDevices.getSupportedConstraints() (en-US)), and to request access to media using MediaDevices.getUserMedia() (en-US).
Navigator.mozNotification 已正式宣告棄用 Gecko 22
Returns a notification object you can use to deliver notifications to the user from your web application.
The Object, returned by the navigator.mozSocial property, is available within the social media provider's panel to provide functionality it may need.
Navigator.presentation (en-US)
Returns a reference to the Presentation (en-US) API.
Navigator.productSub (en-US)
Returns the build number of the current browser (e.g., "20060909").
Returns an empty string. In Netscape 4.7x, returns "US & CA domestic policy" or "Export policy".
Returns a boolean indicating whether the browser is running in standalone mode. Available on Apple's iOS Safari only.
Navigator.storageQuota Read only
Returns a StorageQuota (en-US) interface which provides means to query and request storage usage and quota information.
Navigator.vendor (en-US)
Returns the vendor name of the current browser (e.g., "Netscape6").
Navigator.vendorSub (en-US)
Returns the vendor version number (e.g. "6.1").
Returns a PointerLock object for the Mouse Lock API.


Doesn't inherit any method, but implements those defined in NavigatorID (en-US), NavigatorContentUtils, NavigatorUserMedia, and NavigatorStorageUtils.


Navigator.getVRDisplays() (en-US)
Returns a promise that resolves to an array of VRDisplay (en-US) objects representing any available VR devices connected to the computer.
Navigator.getUserMedia() (en-US)
After having prompted the user for permission, returns the audio or video stream associated to a camera or microphone on the local computer.
Allows web sites to register themselves as a possible handler for a given MIME type.
Allows web sites to register themselves as a possible handler for a given protocol.
Navigator.requestMediaKeySystemAccess() (en-US)
Returns a Promise for a MediaKeySystemAccess object.
Navigator.sendBeacon() (en-US)
Used to asynchronously transfer a small amount of data using HTTP from the User Agent to a web server.
Navigator.share() (en-US)
Invokes the native sharing mechanism of the current platform.
NavigatorID.taintEnabled() (en-US) 已正式宣告棄用 Gecko 1.7.8 已過時 Gecko 9.0
Returns false. JavaScript taint/untaint functions removed in JavaScript 1.2.
Navigator.vibrate() (en-US)
Causes vibration on devices with support for it. Does nothing if vibration support isn't available.


Firefox OS devices adds more non-standard methods. You can consult them on the Firefox OS Navigator extensions article.

Navigator.mozIsLocallyAvailable() (en-US)

Lets code check to see if the document at a given URI is available without using the network.
Allows in-app payment.