MediaDevices
介面提供訪問連線媒體輸入的裝置，如照相機和麥克風，以及螢幕共享等。它可以使你取得任何硬體資源的媒體資料。
屬性
從父類EventTarget中繼承的屬性。
事件
devicechange
返回 devicechange 事件型別的事件處理程式。 也可透過 ondevicechange 訪問
方法
從其父項繼承方法 EventTarget。
MediaDevices。enumerateDevices（）
獲取有關係統中可用的媒體輸入和輸出裝置的一系列資訊。
getSupportedConstraints（）
返回一個符合 MediaTrackSupportedConstraints （en-US） 的物件。該物件指明瞭 MediaStreamTrack 介面支援的可約束的屬性。檢視 Capabilities and constraints in Media Capture and Streams API （Media Stream） 去了解更多相關資訊。
getDisplayMedia（）
提示使用者選擇顯示器或顯示器的一部分（例如視窗）以捕獲為MediaStream 以便共享或記錄。返回解析為MediaStream的Promise。
MediaDevices。getUserMedia（）
在使用者透過提示允許的情況下，開啟系統上的相機或螢幕共享和/或麥克風，並提供 MediaStream 包含影片軌道和/或音訊軌道的輸入。
示例
‘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。onended = function（） {console。log（‘Stream ended’）；}；window。stream = stream； // make variable available to browser consolevideo。srcObject = stream；}）。catch（function（error） {if （error。name === ‘ConstraintNotSatisfiedError’） {errorMsg（‘The resolution ’ + constraints。video。width。exact + ‘x’ +constraints。video。width。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 += ‘
’ + msg + ‘
’；if （typeof error ！== ‘undefined’） {console。error（error）；}}規範
規範
狀態
評論
Media Capture and Streams MediaDevices
Candidate Recommendation
初始定義
瀏覽器相容性
desktop
mobile
Chrome
Edge
Firefox
Internet Explorer
Opera
Safari
WebView Android
Chrome Android
Firefox Android
Opera Android
iOS Safari
Samsung Internet
MediaDevices
Full support47
Full support12
Full support33
No supportNo
Full support30
Full support11
Full support47
Full support47
Full support36
Full support30
Full support11
Full support5。0
devicechange event
Full support57
Full support12
Full support52
No supportNo
Full support34
Full support11
No supportNo
No supportNo
Compatibility unknown； please update this。？
Full support43
Full support11
No supportNo
enumerateDevices
Full support47
Full support12
Full support39Open
No supportNo
Full support34
Full support11
Full support47
Full support47
Full support39Open
Full support34
Full support11
Full support5。0
getDisplayMedia（）
Full support72Open
Full support79Open
Full support66Open
No supportNo
Full support60Open
Full support13
No supportNofootnoteOpen
No supportNo
No supportNofootnoteOpen
No supportNo
No supportNo
No supportNo
Audio capture support
Full support74footnoteOpen
Full support≤ 79footnoteOpen
No supportNo
No supportNo
Compatibility unknown； please update this。？
No supportNo
No supportNo
No supportNo
No supportNo
No supportNo
No supportNo
No supportNo
getSupportedConstraints
Full support53
Full support12
Full support44
No supportNo
Full support40
Full support11
Full support53
Full support52
Full support50
Full support41
Full support11
Full support6。0
getUserMedia
Full support53footnoteOpen
Full support12
Full support36footnoteOpen
No supportNo
Full support40footnoteOpen
Full support11
Full support53
Full support53footnoteOpen
Full support36footnoteOpen
Full support41footnoteOpen
Full support11
Full support6。0
Secure context required
Full support53
Full support79
Full support68
No supportNo
Full support40
Compatibility unknown； please update this。？
Full support53
Full support53
Full support68
Full support41
Compatibility unknown； please update this。？
Full support6。0
ondevicechange
Full support57
Full support12
Full support52Open
No supportNo
Full support34
Full support11
No supportNo
No supportNo
Full supportYes
Full support34
Full support11
No supportNo
Stereo audio capture
Compatibility unknown； please update this。？
Compatibility unknown； please update this。？
Full support55
No supportNo
Compatibility unknown； please update this。？
No supportNo
Compatibility unknown； please update this。？
Compatibility unknown； please update this。？
No supportNo
Compatibility unknown； please update this。？
No supportNo
Compatibility unknown； please update this。？
