---
title: Navigator
slug: Web/API/Navigator
tags:
  - API
  - HTML-DOM
  - Interface
  - NeedsTranslation
  - Reference
  - TopicStub
  - Web Performance
translation_of: Web/API/Navigator
---
<p>{{ APIRef("DOM4") }}</p>

<p><code><strong>Navigator</strong></code> 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。</p>

<p><code>Navigator</code> 可以被檢索，只要使用唯讀的 {{domxref("window.navigator")}} 屬性。</p>

<h2 id="屬性">屬性</h2>

<p><em>它並不繼承任何屬性，但其實做已被定義於 {{domxref("NavigatorID")}}、{{domxref("NavigatorLanguage")}}、{{domxref("NavigatorOnLine")}}、{{domxref("NavigatorContentUtils")}}、{{domxref("NavigatorStorage")}}、{{domxref("NavigatorStorageUtils")}}、{{domxref("NavigatorConcurrentHardware")}}、{{domxref("NavigatorPlugins")}}、{{domxref("NavigatorUserMedia")}}.</em></p>

<h3 id="標準">標準</h3>

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

<h3 id="Methods" name="Methods">Non-standard</h3>

<div class="note">
<p>Firefox OS devices adds more non-standard properties. You can consult them on the <a href="/en-US/docs/Mozilla/Firefox_OS/API/Navigator">Firefox OS Navigator extensions article</a>.</p>
</div>

 <dl>
 <dt>{{domxref("Navigator.buildID")}} {{non-standard_inline}}</dt>
 <dd>Returns the build identifier of the browser (e.g., "2006090803").</dd>
 <dt>{{domxref("Navigator.cookieEnabled")}} {{non-standard_inline}}</dt>
 <dd>Returns a boolean indicating whether cookies are enabled in the browser or not.</dd>
 <dt>{{domxref("Navigator.credentials")}} {{non-standard_inline}}</dt>
 <dd>Returns the {{domxref("CredentialsContainer")}} interface which exposes methods to request credentials and notify the user agent when interesting events occur such as successful sign in or sign out. </dd>
 <dt>{{domxref("Navigator.doNotTrack")}} {{non-standard_inline}}</dt>
 <dd>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.</dd>
 <dt>{{domxref("Navigator.id")}} {{non-standard_inline}}</dt>
 <dd>Returns the {{domxref("window.navigator.id", "id")}} object which you can use to add support for <a href="/en-US/docs/BrowserID" title="BrowserID">BrowserID</a> to your web site.</dd>
 <dt>{{domxref("Navigator.mediaDevices")}} {{non-standard_inline}}</dt>
 <dd>Returns a reference to a {{domxref("MediaDevices")}} object which can then be used to get information about available media devices ({{domxref("MediaDevices.enumerateDevices()")}}), find out what constrainable properties are supported for media on the user's computer and user agent ({{domxref("MediaDevices.getSupportedConstraints()")}}), and to request access to media using {{domxref("MediaDevices.getUserMedia()")}}.</dd>
 <dt>{{domxref("Navigator.mozNotification")}} {{deprecated_inline("22")}} {{non-standard_inline}}<br>
 {{domxref("Navigator.webkitNotification")}}</dt>
 <dd>Returns a {{domxref("navigator.mozNotification", "notification")}} object you can use to deliver notifications to the user from your web application.</dd>
 <dt>{{domxref("Navigator.mozSocial")}} {{non-standard_inline}}</dt>
 <dd>The Object, returned by the <code>navigator.mozSocial</code> property, is available within the social media provider's panel to provide functionality it may need.</dd>
 <dt>{{domxref("Navigator.presentation")}} {{non-standard_inline}}</dt>
 <dd>Returns a reference to the {{domxref("Presentation")}} API.</dd>
 <dt>{{domxref("Navigator.productSub")}} {{non-standard_inline}}</dt>
 <dd>Returns the build number of the current browser (e.g., "20060909").</dd>
 <dt>{{domxref("Navigator.securitypolicy")}} {{non-standard_inline}}</dt>
 <dd>Returns an empty string. In Netscape 4.7x, returns "US &amp; CA domestic policy" or "Export policy".</dd>
 <dt>{{domxref("Navigator.standalone")}} {{non-standard_inline}}</dt>
 <dd>Returns a boolean indicating whether the browser is running in standalone mode. Available on Apple's iOS Safari only.</dd>
 <dt>{{domxref("Navigator.storageQuota")}} {{readonlyinline}} {{experimental_inline}}</dt>
 <dd>Returns a {{domxref('StorageQuota')}} interface which provides means to query and request storage usage and quota information.</dd>
 <dt>{{domxref("Navigator.vendor")}} {{non-standard_inline}}</dt>
 <dd>Returns the vendor name of the current browser (e.g., "Netscape6").</dd>
 <dt>{{domxref("Navigator.vendorSub")}} {{non-standard_inline}}</dt>
 <dd>Returns the vendor version number (e.g. "6.1").</dd>
 <dt>{{domxref("Navigator.webkitPointer")}} {{non-standard_inline}}</dt>
 <dd>Returns a PointerLock object for the <a href="/en-US/docs/API/Pointer_Lock_API" title="Mouse Lock API">Mouse Lock API</a>.</dd>
</dl>

<h2 id="Methods" name="Methods">方法</h2>

<p><em>Doesn't inherit any method, but implements those defined in {{domxref("NavigatorID")}}, {{domxref("NavigatorContentUtils")}}, <em>{{domxref("NavigatorUserMedia")}}, </em>and {{domxref("NavigatorStorageUtils")}}.</em></p>

<h3 id="Standard">Standard</h3>

<dl>
 <dt>{{domxref("Navigator.getVRDisplays()")}} {{experimental_inline}}</dt>
 <dd>Returns a promise that resolves to an array of {{domxref("VRDisplay")}} objects representing any available VR devices connected to the computer.</dd>
 <dt>{{domxref("Navigator.getUserMedia", "Navigator.getUserMedia()")}} {{experimental_inline}}</dt>
 <dd>After having prompted the user for permission, returns the audio or video stream associated to a camera or microphone on the local computer.</dd>
 <dt>{{domxref("Navigator.registerContentHandler()")}}</dt>
 <dd>Allows web sites to register themselves as a possible handler for a given MIME type.</dd>
 <dt>{{domxref("Navigator.registerProtocolHandler()")}}</dt>
 <dd>Allows web sites to register themselves as a possible handler for a given protocol.</dd>
 <dt>{{domxref("Navigator.requestMediaKeySystemAccess()")}} {{experimental_inline}}</dt>
 <dd>Returns a <span style="line-height: 19.0909080505371px;">{{jsxref("Promise")}} for a MediaKeySystemAccess object.</span></dd>
 <dt>{{domxref("Navigator.sendBeacon()")}}{{experimental_inline}}</dt>
 <dd>Used to asynchronously transfer a small amount of data using {{Glossary("HTTP")}} from the User Agent to a web server.</dd>
 <dt>{{domxref("Navigator.share()")}}{{experimental_inline}}</dt>
 <dd>Invokes the native sharing mechanism of the current platform.</dd>
 <dt>{{domxref("NavigatorID.taintEnabled()")}} {{deprecated_inline("1.7.8")}} {{obsolete_inline("9.0")}} {{experimental_inline}}</dt>
 <dd>Returns <code>false</code>. JavaScript taint/untaint functions removed in JavaScript 1.2.</dd>
 <dt>{{domxref("Navigator.vibrate()")}} {{gecko_minversion_inline("11.0")}}</dt>
 <dd>Causes vibration on devices with support for it. Does nothing if vibration support isn't available.</dd>
</dl>

<h3 id="Specification" name="Specification">Non-standard</h3>

<div class="note">
<p>Firefox OS devices adds more non-standard methods. You can consult them on the <a href="/en-US/docs/Mozilla/Firefox_OS/API/Navigator">Firefox OS Navigator extensions article</a>.</p>
</div>

<p>{{domxref("Navigator.mozIsLocallyAvailable()")}} {{non-standard_inline}}</p>

<dl>
 <dd>Lets code check to see if the document at a given URI is available without using the network.</dd>
 <dt>{{domxref("Navigator.mozPay()")}} {{non-standard_inline}}</dt>
 <dd>Allows in-app payment.</dd>
</dl>