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class="sidebar-filter-container"><div class="sidebar-filter "><label id="sidebar-filter-label" class="sidebar-filter-label" for="sidebar-filter-input"><span class="icon icon-filter"></span><span class="visually-hidden">Filter sidebar</span></label><input id="sidebar-filter-input" autoComplete="off" class="sidebar-filter-input-field false" type="text" placeholder="Filter" value=""/><button type="button" class="button action has-icon clear-sidebar-filter-button"><span class="button-wrap"><span class="icon icon-cancel "></span><span class="visually-hidden">Clear filter input</span></span></button></div></section></header><div class="sidebar-inner-nav"><div class="in-nav-toc"><div class="document-toc-container"><section class="document-toc"><header><h2 class="document-toc-heading">在本文中</h2></header><ul class="document-toc-list"><li class="document-toc-item "><a class="document-toc-link" href="#屬性">屬性</a></li><li class="document-toc-item "><a class="document-toc-link" href="#方法">方法</a></li><li class="document-toc-item "><a class="document-toc-link" href="#事件">事件</a></li><li class="document-toc-item "><a class="document-toc-link" href="#範例">範例</a></li><li class="document-toc-item "><a class="document-toc-link" href="#規範">規範</a></li><li class="document-toc-item "><a class="document-toc-link" href="#瀏覽器兼容性">瀏覽器兼容性</a></li><li class="document-toc-item "><a class="document-toc-link" href="#參見">參見</a></li></ul></section></div></div><div class="sidebar-body"><ol><li class="section"><a href="/zh-TW/docs/Web/API/Media_Capture_and_Streams_API">Media Capture and Streams API</a></li><li class="section"><em><a href="/zh-TW/docs/Web/API/MediaDevices" aria-current="page"><code>MediaDevices</code></a></em></li><li class="toggle"><details open=""><summary>實體方法</summary><ol><li><a href="/zh-TW/docs/Web/API/MediaDevices/enumerateDevices"><code>enumerateDevices()</code></a></li><li><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/MediaDevices/getDisplayMedia"><code>getDisplayMedia()</code></a></li><li><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/MediaDevices/getSupportedConstraints"><code>getSupportedConstraints()</code></a></li><li><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/MediaDevices/getUserMedia"><code>getUserMedia()</code></a></li><li><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/MediaDevices/selectAudioOutput"><code>selectAudioOutput()</code></a><abbr class="icon icon-experimental" title="實驗性質。行為可能會在未來發生變動。"> <span class="visually-hidden">實驗性質</span> </abbr></li></ol></details></li><li class="toggle"><details open=""><summary>事件</summary><ol><li><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/MediaDevices/devicechange_event"><code>devicechange</code></a></li></ol></details></li><li class="toggle"><details open=""><summary>繼承</summary><ol><li><a href="/zh-TW/docs/Web/API/EventTarget"><code>EventTarget</code></a></li></ol></details></li><li class="toggle"><details open=""><summary>Media Capture and Streams 的相關頁面</summary><ol><li><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/CanvasCaptureMediaStreamTrack"><code>CanvasCaptureMediaStreamTrack</code></a></li><li><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/HTMLCanvasElement/captureStream"><code>HTMLCanvasElement.captureStream()</code></a></li><li><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/HTMLMediaElement/captureStream"><code>HTMLMediaElement.captureStream()</code></a></li><li><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/InputDeviceInfo"><code>InputDeviceInfo</code></a></li><li><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/MediaDeviceInfo"><code>MediaDeviceInfo</code></a></li><li><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/MediaStream"><code>MediaStream</code></a></li><li><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/MediaStreamTrack"><code>MediaStreamTrack</code></a></li><li><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/MediaStreamTrackEvent"><code>MediaStreamTrackEvent</code></a></li><li><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/MediaTrackConstraints"><code>MediaTrackConstraints</code></a></li><li><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/MediaTrackSettings"><code>MediaTrackSettings</code></a></li><li><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/MediaTrackSupportedConstraints"><code>MediaTrackSupportedConstraints</code></a></li><li><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/Navigator/mediaDevices"><code>Navigator.mediaDevices</code></a></li><li><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/OverconstrainedError"><code>OverconstrainedError</code></a></li></ol></details></li></ol></div></div><section class="place side"></section></nav></aside><div class="toc-container"><aside class="toc"><nav><div class="document-toc-container"><section class="document-toc"><header><h2 class="document-toc-heading">在本文中</h2></header><ul class="document-toc-list"><li class="document-toc-item "><a class="document-toc-link" href="#屬性">屬性</a></li><li class="document-toc-item "><a class="document-toc-link" href="#方法">方法</a></li><li class="document-toc-item "><a class="document-toc-link" href="#事件">事件</a></li><li class="document-toc-item "><a class="document-toc-link" href="#範例">範例</a></li><li class="document-toc-item "><a class="document-toc-link" href="#規範">規範</a></li><li class="document-toc-item "><a class="document-toc-link" href="#瀏覽器兼容性">瀏覽器兼容性</a></li><li class="document-toc-item "><a class="document-toc-link" href="#參見">參見</a></li></ul></section></div></nav></aside><section class="place side"></section></div></div><main id="content" class="main-content "><article class="main-page-content" lang="zh-TW"><header><h1>MediaDevices</h1><details class="baseline-indicator high"><summary><span class="indicator" role="img" aria-label="Baseline Check"></span><h2>Baseline <span class="not-bold">Widely available</span></h2><div class="browsers"><span class="engine" title="Supported in Chrome and Edge"><span class="browser chrome supported" role="img" aria-label="Chrome check"></span><span class="browser edge supported" role="img" aria-label="Edge check"></span></span><span class="engine" title="Supported in Firefox"><span class="browser firefox supported" role="img" aria-label="Firefox check"></span></span><span class="engine" title="Supported in Safari"><span class="browser safari supported" role="img" aria-label="Safari check"></span></span></div><span class="icon icon-chevron "></span></summary><div class="extra"><p>This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2017.</p><ul><li><a href="/zh-TW/docs/Glossary/Baseline/Compatibility" data-glean="baseline_link_learn_more" target="_blank" class="learn-more">Learn more</a></li><li><a href="#瀏覽器相容性" data-glean="baseline_link_bcd_table">See full compatibility</a></li><li><a href="https://survey.alchemer.com/s3/7634825/MDN-baseline-feedback?page=%2Fzh-TW%2Fdocs%2FWeb%2FAPI%2FMediaDevices&level=high" data-glean="baseline_link_feedback" class="feedback-link" target="_blank" rel="noreferrer">Report feedback</a></li></ul></div></details></header><div class="section-content"><p><code>MediaDevices</code>介面可以存取連接的媒體輸入設備，像是相機、麥克風，以及螢幕分享。它可以存取任何硬體資源的媒體數據。</p><svg viewBox="-1 -1 650 42" preserveAspectRatio="xMinYMin meet"> <a style="text-decoration: none;" href="/zh-TW/docs/Web/API/EventTarget"> <rect x="0" y="0" width="88" height="25" fill="#fff" stroke="#D4DDE4" stroke-width="2px"></rect> <text x="44" y="16" font-size="10px" fill="#4D4E53" text-anchor="middle"> EventTarget </text> </a> <line x1="88" y1="14" x2="118" y2="14" stroke="#D4DDE4"></line> <polyline points="88,14 98,9 98,19 88,14" stroke="#D4DDE4" fill="#fff"></polyline> <a style="text-decoration: none;" href="/zh-TW/docs/Web/API/MediaDevices" aria-current="page"> <rect x="118" y="0" width="96" height="25" fill="#F4F7F8" stroke="#D4DDE4" stroke-width="2px"></rect> <text x="166" y="16" font-size="10px" fill="#4D4E53" text-anchor="middle"> MediaDevices </text> </a></svg></div><section aria-labelledby="屬性"><h2 id="屬性"><a href="#屬性">屬性</a></h2><div class="section-content"><p><em>繼承父類<a href="/zh-TW/docs/Web/API/EventTarget"><code>EventTarget</code></a>的屬性。</em></p></div></section><section aria-labelledby="方法"><h2 id="方法"><a href="#方法">方法</a></h2><div class="section-content"><p><em>繼承父類<a href="/zh-TW/docs/Web/API/EventTarget"><code>EventTarget</code></a>的方法。</em></p> <dl> <dt id="enumeratedevices"><a href="/zh-TW/docs/Web/API/MediaDevices/enumerateDevices" title="enumerateDevices()"><code>enumerateDevices()</code></a></dt> <dd> <p>取得一系列關於系統中可用的媒體輸入和媒體輸出設備的資訊。</p> </dd> <dt id="getsupportedconstraints"><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/MediaDevices/getSupportedConstraints"><code>getSupportedConstraints()</code></a></dt> <dd> <p>返回一個符合 <a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/MediaTrackSupportedConstraints"><code>MediaTrackSupportedConstraints</code></a> 的物件，該物件標示出 <a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/MediaStreamTrack"><code>MediaStreamTrack</code></a> 介面支援哪些可約束的屬性。請參考 <a href="/en-US/docs/Web/API/Media_Capture_and_Streams_API/Constraints" class="only-in-en-us" title="此頁面目前僅提供英文版本">Media Streams API</a> 瞭解更多關於 <code>constraints</code> 的資訊。</p> </dd> <dt id="getdisplaymedia"><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/MediaDevices/getDisplayMedia"><code>getDisplayMedia()</code></a></dt> <dd> <p>出現提示視窗讓使用者選擇要捕捉整個螢幕或是部分(例如一個視窗)的畫面做為<a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/MediaStream"><code>MediaStream</code></a>，用於分享或錄製。返回值為一個解析為<code>MediaStream</code> 的 promise。</p> </dd> <dt id="getusermedia"><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/MediaDevices/getUserMedia"><code>getUserMedia()</code></a></dt> <dd> <p>透過提示視窗獲得使用者的許可後，打開系統上的相機和/或麥克風麥克風，並返回一包含視訊輸入軌道和/或音訊輸入軌道的<a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/MediaStream"><code>MediaStream</code></a>。</p> </dd> <dt id="selectaudiooutput"><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/MediaDevices/selectAudioOutput"><code>selectAudioOutput()</code></a></dt> <dd> <p>出現提示視窗讓使用者選擇特定的音訊輸出設備。</p> </dd> </dl></div></section><section aria-labelledby="事件"><h2 id="事件"><a href="#事件">事件</a></h2><div class="section-content"><dl> <dt id="devicechange"><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/MediaDevices/devicechange_event"><code>devicechange</code></a></dt> <dd> <p>在媒體輸入或媒體輸出設備連接上使用者的系統裝置，或是從使用者的系統裝置移除時觸發。</p> </dd> </dl></div></section><section aria-labelledby="範例"><h2 id="範例"><a href="#範例">範例</a></h2><div class="section-content"><div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>"use strict"; // Put variables in global scope to make them available to the browser console. var video = document.querySelector("video"); var constraints = (window.constraints = { audio: false, video: true, }); var errorElement = document.querySelector("#errorMsg"); navigator.mediaDevices .getUserMedia(constraints) .then(function (stream) { var videoTracks = stream.getVideoTracks(); console.log("Got stream with constraints:", constraints); console.log("Using video device: " + videoTracks[0].label); stream.onremovetrack = function () { console.log("Stream ended"); }; window.stream = stream; // make variable available to browser console video.srcObject = stream; }) .catch(function (error) { if (error.name === "ConstraintNotSatisfiedError") { errorMsg( "The resolution " + constraints.video.width.exact + "x" + constraints.video.height.exact + " px is not supported by your device.", ); } else if (error.name === "PermissionDeniedError") { errorMsg( "Permissions have not been granted to use your camera and " + "microphone, you need to allow the page access to your devices in " + "order for the demo to work.", ); } errorMsg("getUserMedia error: " + error.name, error); }); function errorMsg(msg, error) { errorElement.innerHTML += "<p>" + msg + "</p>"; if (typeof error !== "undefined") { console.error(error); } } </code></pre></div></div></section><h2 id="規範"><a href="#規範">規範</a></h2><table class="standard-table"><thead><tr><th scope="col">Specification</th></tr></thead><tbody><tr><td><a href="https://w3c.github.io/mediacapture-main/#mediadevices">Media Capture and Streams <br/><small># mediadevices</small></a></td></tr></tbody></table><h2 id="瀏覽器兼容性"><a href="#瀏覽器兼容性">瀏覽器兼容性</a></h2><p>BCD tables only load in the browser<noscript> with JavaScript enabled. Enable JavaScript to view data.</noscript></p><section aria-labelledby="參見"><h2 id="參見"><a href="#參見">參見</a></h2><div class="section-content"><ul> <li><a href="/zh-TW/docs/Web/API/Media_Capture_and_Streams_API">Media Capture and Streams API</a>: The API this interface is part of.</li> <li><a href="/en-US/docs/Web/API/Screen_Capture_API" class="only-in-en-us" title="此頁面目前僅提供英文版本">Screen Capture API</a>: The API defining the <a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/MediaDevices/getDisplayMedia"><code>getDisplayMedia()</code></a> method.</li> <li><a href="/en-US/docs/Web/API/WebRTC_API" class="only-in-en-us" title="此頁面目前僅提供英文版本">WebRTC API</a></li> <li><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/Navigator/mediaDevices"><code>Navigator.mediaDevices</code></a>: Returns a reference to a <code>MediaDevices</code> object that can be used to access devices.</li> <li><a href="https://github.com/chrisjohndigital/CameraCaptureJS" class="external" target="_blank">CameraCaptureJS:</a> HTML5 video capture and playback using <code>MediaDevices</code> and the MediaStream Recording API (<a href="https://github.com/chrisjohndigital/CameraCaptureJS" class="external" target="_blank">source on GitHub</a>)</li> <li><a href="https://github.com/chrisjohndigital/OpenLang" class="external" target="_blank">OpenLang</a>: HTML5 video language lab web application using <code>MediaDevices</code> and the MediaStream Recording API for video recording (<a href="https://github.com/chrisjohndigital/OpenLang" class="external" target="_blank">source on GitHub</a>)</li> </ul></div></section></article><aside class="article-footer"><div class="article-footer-inner"><div class="svg-container"><svg xmlns="http://www.w3.org/2000/svg" width="162" height="162" viewBox="0 0 162 162" fill="none" role="none"><mask id="b" fill="#fff"><path d="M97.203 47.04c8.113-7.886 18.004-13.871 28.906-17.492a78 78 0 0 1 33.969-3.39c11.443 1.39 22.401 5.295 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Content available under <a href="/zh-TW/docs/MDN/Writing_guidelines/Attrib_copyright_license">a Creative Commons license</a>.</p></div></div></footer></div><script type="application/json" id="hydration">{"url":"/zh-TW/docs/Web/API/MediaDevices","doc":{"isMarkdown":true,"isTranslated":true,"isActive":true,"flaws":{},"title":"MediaDevices","mdn_url":"/zh-TW/docs/Web/API/MediaDevices","locale":"zh-TW","native":"正體中文 (繁體)","browserCompat":["api.MediaDevices"],"baseline":{"baseline":"high","baseline_high_date":"2020-03-19","baseline_low_date":"2017-09-19","support":{"chrome":"53","chrome_android":"53","edge":"12","firefox":"36","firefox_android":"36","safari":"11","safari_ios":"11"}},"sidebarHTML":"<ol><li class=\"section\"><a href=\"/zh-TW/docs/Web/API/Media_Capture_and_Streams_API\">Media Capture and Streams API</a></li><li class=\"section\"><em><a href=\"/zh-TW/docs/Web/API/MediaDevices\" aria-current=\"page\"><code>MediaDevices</code></a></em></li><li class=\"toggle\"><details open=\"\"><summary>實體方法</summary><ol><li><a href=\"/zh-TW/docs/Web/API/MediaDevices/enumerateDevices\"><code>enumerateDevices()</code></a></li><li><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/MediaDevices/getDisplayMedia\"><code>getDisplayMedia()</code></a></li><li><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/MediaDevices/getSupportedConstraints\"><code>getSupportedConstraints()</code></a></li><li><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/MediaDevices/getUserMedia\"><code>getUserMedia()</code></a></li><li><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/MediaDevices/selectAudioOutput\"><code>selectAudioOutput()</code></a><abbr class=\"icon icon-experimental\" title=\"實驗性質。行為可能會在未來發生變動。\">\n <span class=\"visually-hidden\">實驗性質</span>\n</abbr></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>事件</summary><ol><li><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/MediaDevices/devicechange_event\"><code>devicechange</code></a></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>繼承</summary><ol><li><a href=\"/zh-TW/docs/Web/API/EventTarget\"><code>EventTarget</code></a></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>Media Capture and Streams 的相關頁面</summary><ol><li><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/CanvasCaptureMediaStreamTrack\"><code>CanvasCaptureMediaStreamTrack</code></a></li><li><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/HTMLCanvasElement/captureStream\"><code>HTMLCanvasElement.captureStream()</code></a></li><li><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/HTMLMediaElement/captureStream\"><code>HTMLMediaElement.captureStream()</code></a></li><li><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/InputDeviceInfo\"><code>InputDeviceInfo</code></a></li><li><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/MediaDeviceInfo\"><code>MediaDeviceInfo</code></a></li><li><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/MediaStream\"><code>MediaStream</code></a></li><li><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/MediaStreamTrack\"><code>MediaStreamTrack</code></a></li><li><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/MediaStreamTrackEvent\"><code>MediaStreamTrackEvent</code></a></li><li><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/MediaTrackConstraints\"><code>MediaTrackConstraints</code></a></li><li><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/MediaTrackSettings\"><code>MediaTrackSettings</code></a></li><li><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/MediaTrackSupportedConstraints\"><code>MediaTrackSupportedConstraints</code></a></li><li><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/Navigator/mediaDevices\"><code>Navigator.mediaDevices</code></a></li><li><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/OverconstrainedError\"><code>OverconstrainedError</code></a></li></ol></details></li></ol>","sidebarMacro":"APIRef","body":[{"type":"prose","value":{"id":null,"title":null,"isH3":false,"content":"<p><code>MediaDevices</code>介面可以存取連接的媒體輸入設備，像是相機、麥克風，以及螢幕分享。它可以存取任何硬體資源的媒體數據。</p><svg viewBox=\"-1 -1 650 42\" preserveAspectRatio=\"xMinYMin meet\">\n <a style=\"text-decoration: none;\" href=\"/zh-TW/docs/Web/API/EventTarget\">\n <rect x=\"0\" y=\"0\" width=\"88\" height=\"25\" fill=\"#fff\" stroke=\"#D4DDE4\" stroke-width=\"2px\"></rect>\n <text x=\"44\" y=\"16\" font-size=\"10px\" fill=\"#4D4E53\" text-anchor=\"middle\">\n EventTarget\n </text>\n </a>\n <line x1=\"88\" y1=\"14\" x2=\"118\" y2=\"14\" stroke=\"#D4DDE4\"></line>\n <polyline points=\"88,14 98,9 98,19 88,14\" stroke=\"#D4DDE4\" fill=\"#fff\"></polyline>\n <a style=\"text-decoration: none;\" href=\"/zh-TW/docs/Web/API/MediaDevices\" aria-current=\"page\">\n <rect x=\"118\" y=\"0\" width=\"96\" height=\"25\" fill=\"#F4F7F8\" stroke=\"#D4DDE4\" stroke-width=\"2px\"></rect>\n <text x=\"166\" y=\"16\" font-size=\"10px\" fill=\"#4D4E53\" text-anchor=\"middle\">\n MediaDevices\n </text>\n </a></svg>"}},{"type":"prose","value":{"id":"屬性","title":"屬性","isH3":false,"content":"<p><em>繼承父類<a href=\"/zh-TW/docs/Web/API/EventTarget\"><code>EventTarget</code></a>的屬性。</em></p>"}},{"type":"prose","value":{"id":"方法","title":"方法","isH3":false,"content":"<p><em>繼承父類<a href=\"/zh-TW/docs/Web/API/EventTarget\"><code>EventTarget</code></a>的方法。</em></p>\n<dl>\n <dt id=\"enumeratedevices\"><a href=\"/zh-TW/docs/Web/API/MediaDevices/enumerateDevices\" title=\"enumerateDevices()\"><code>enumerateDevices()</code></a></dt>\n <dd>\n <p>取得一系列關於系統中可用的媒體輸入和媒體輸出設備的資訊。</p>\n </dd>\n <dt id=\"getsupportedconstraints\"><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/MediaDevices/getSupportedConstraints\"><code>getSupportedConstraints()</code></a></dt>\n <dd>\n <p>返回一個符合 <a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/MediaTrackSupportedConstraints\"><code>MediaTrackSupportedConstraints</code></a> 的物件，該物件標示出 <a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/MediaStreamTrack\"><code>MediaStreamTrack</code></a> 介面支援哪些可約束的屬性。請參考 <a href=\"/en-US/docs/Web/API/Media_Capture_and_Streams_API/Constraints\" class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\">Media Streams API</a> 瞭解更多關於 <code>constraints</code> 的資訊。</p>\n </dd>\n <dt id=\"getdisplaymedia\"><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/MediaDevices/getDisplayMedia\"><code>getDisplayMedia()</code></a></dt>\n <dd>\n <p>出現提示視窗讓使用者選擇要捕捉整個螢幕或是部分(例如一個視窗)的畫面做為<a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/MediaStream\"><code>MediaStream</code></a>，用於分享或錄製。返回值為一個解析為<code>MediaStream</code> 的 promise。</p>\n </dd>\n <dt id=\"getusermedia\"><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/MediaDevices/getUserMedia\"><code>getUserMedia()</code></a></dt>\n <dd>\n <p>透過提示視窗獲得使用者的許可後，打開系統上的相機和/或麥克風麥克風，並返回一包含視訊輸入軌道和/或音訊輸入軌道的<a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/MediaStream\"><code>MediaStream</code></a>。</p>\n </dd>\n <dt id=\"selectaudiooutput\"><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/MediaDevices/selectAudioOutput\"><code>selectAudioOutput()</code></a></dt>\n <dd>\n <p>出現提示視窗讓使用者選擇特定的音訊輸出設備。</p>\n </dd>\n</dl>"}},{"type":"prose","value":{"id":"事件","title":"事件","isH3":false,"content":"<dl>\n <dt id=\"devicechange\"><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/MediaDevices/devicechange_event\"><code>devicechange</code></a></dt>\n <dd>\n <p>在媒體輸入或媒體輸出設備連接上使用者的系統裝置，或是從使用者的系統裝置移除時觸發。</p>\n </dd>\n</dl>"}},{"type":"prose","value":{"id":"範例","title":"範例","isH3":false,"content":"<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>\"use strict\";\n\n// Put variables in global scope to make them available to the browser console.\nvar video = document.querySelector(\"video\");\nvar constraints = (window.constraints = {\n audio: false,\n video: true,\n});\nvar errorElement = document.querySelector(\"#errorMsg\");\n\nnavigator.mediaDevices\n .getUserMedia(constraints)\n .then(function (stream) {\n var videoTracks = stream.getVideoTracks();\n console.log(\"Got stream with constraints:\", constraints);\n console.log(\"Using video device: \" + videoTracks[0].label);\n stream.onremovetrack = function () {\n console.log(\"Stream ended\");\n };\n window.stream = stream; // make variable available to browser console\n video.srcObject = stream;\n })\n .catch(function (error) {\n if (error.name === \"ConstraintNotSatisfiedError\") {\n errorMsg(\n \"The resolution \" +\n constraints.video.width.exact +\n \"x\" +\n constraints.video.height.exact +\n \" px is not supported by your device.\",\n );\n } else if (error.name === \"PermissionDeniedError\") {\n errorMsg(\n \"Permissions have not been granted to use your camera and \" +\n \"microphone, you need to allow the page access to your devices in \" +\n \"order for the demo to work.\",\n );\n }\n errorMsg(\"getUserMedia error: \" + error.name, error);\n });\n\nfunction errorMsg(msg, error) {\n errorElement.innerHTML += \"<p>\" + msg + \"</p>\";\n if (typeof error !== \"undefined\") {\n console.error(error);\n }\n}\n</code></pre></div>"}},{"type":"specifications","value":{"title":"規範","id":"規範","isH3":false,"specifications":[{"bcdSpecificationURL":"https://w3c.github.io/mediacapture-main/#mediadevices","title":"Media Capture and Streams"}],"query":"api.MediaDevices"}},{"type":"browser_compatibility","value":{"title":"瀏覽器兼容性","id":"瀏覽器兼容性","isH3":false,"query":"api.MediaDevices"}},{"type":"prose","value":{"id":"參見","title":"參見","isH3":false,"content":"<ul>\n <li><a href=\"/zh-TW/docs/Web/API/Media_Capture_and_Streams_API\">Media Capture and Streams API</a>: The API this interface is part of.</li>\n <li><a href=\"/en-US/docs/Web/API/Screen_Capture_API\" class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\">Screen Capture API</a>: The API defining the <a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/MediaDevices/getDisplayMedia\"><code>getDisplayMedia()</code></a> method.</li>\n <li><a href=\"/en-US/docs/Web/API/WebRTC_API\" class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\">WebRTC API</a></li>\n <li><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/Navigator/mediaDevices\"><code>Navigator.mediaDevices</code></a>: Returns a reference to a <code>MediaDevices</code> object that can be used to access devices.</li>\n <li><a href=\"https://github.com/chrisjohndigital/CameraCaptureJS\" class=\"external\" target=\"_blank\">CameraCaptureJS:</a> HTML5 video capture and playback using <code>MediaDevices</code> and the MediaStream Recording API (<a href=\"https://github.com/chrisjohndigital/CameraCaptureJS\" class=\"external\" target=\"_blank\">source on GitHub</a>)</li>\n <li><a href=\"https://github.com/chrisjohndigital/OpenLang\" class=\"external\" target=\"_blank\">OpenLang</a>: HTML5 video language lab web application using <code>MediaDevices</code> and the MediaStream Recording API for video recording (<a href=\"https://github.com/chrisjohndigital/OpenLang\" class=\"external\" target=\"_blank\">source on GitHub</a>)</li>\n</ul>"}}],"toc":[{"text":"屬性","id":"屬性"},{"text":"方法","id":"方法"},{"text":"事件","id":"事件"},{"text":"範例","id":"範例"},{"text":"規範","id":"規範"},{"text":"瀏覽器兼容性","id":"瀏覽器兼容性"},{"text":"參見","id":"參見"}],"summary":"MediaDevices介面可以存取連接的媒體輸入設備，像是相機、麥克風，以及螢幕分享。它可以存取任何硬體資源的媒體數據。","popularity":0,"modified":"2023-07-14T09:46:22.000Z","other_translations":[{"locale":"de","title":"MediaDevices","native":"Deutsch"},{"locale":"en-US","title":"MediaDevices","native":"English (US)"},{"locale":"es","title":"MediaDevices","native":"Español"},{"locale":"fr","title":"MediaDevices","native":"Français"},{"locale":"ja","title":"MediaDevices","native":"日本語"},{"locale":"ko","title":"MediaDevices","native":"한국어"},{"locale":"pt-BR","title":"MediaDevices","native":"Português (do Brasil)"},{"locale":"ru","title":"MediaDevices","native":"Русский"},{"locale":"zh-CN","title":"MediaDevices","native":"中文 (简体)"}],"pageType":"unknown","source":{"folder":"zh-tw/web/api/mediadevices","github_url":"https://github.com/mdn/translated-content/blob/main/files/zh-tw/web/api/mediadevices/index.md","last_commit_url":"https://github.com/mdn/translated-content/commit/58bf1ef00cdf14f8bf31517cf0e87252050b4a8b","filename":"index.md"},"short_title":"MediaDevices","parents":[{"uri":"/zh-TW/docs/Web","title":"給開發者的網頁技術文件"},{"uri":"/zh-TW/docs/Web/API","title":"Web APIs"},{"uri":"/zh-TW/docs/Web/API/MediaDevices","title":"MediaDevices"}],"pageTitle":"MediaDevices - Web APIs | MDN","noIndexing":false}}</script></body></html>