devicechange - Web API 接口参考 编辑

每当媒体设备（例如相机，麦克风或扬声器）连接到系统或从系统中移除时，devicechange 事件就会被发送到 MediaDevices  实例。 这是一个没有附加属性的通用 Event 。

一般信息

规范

Media Capture and Streams

接口

Event

是否冒泡

No

是否可取消

No

对象

MediaDevices

默认动作

None

属性

Property	Type	Description
target只读	EventTarget	事件对象 (位于DOM树最上面的元素).
type 只读	DOMString	事件类型.
bubbles 只读	Boolean	是否冒泡
cancelable 只读	Boolean	是否可被取消

相关事件

无.

样例

有关使用 devicechange 事件更新屏幕上设备列表的示例，请参阅 Example in MediaDevices.ondevicechange。

Specifications

Specification	Status	Comment
Media Capture and Streams devicechange	Candidate Recommendation	Initial specification.

浏览器兼容性

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

• Desktop
• Mobile

Feature	Chrome	Firefox (Gecko)	Edge	Internet Explorer	Opera	Safari (WebKit)
Basic support	52.0	51 (51)[1]	(Yes)	?	?	39	?

Feature	Android	Android Webview	Edge	Firefox Mobile (Gecko)	Firefox OS	IE Mobile	Opera Mobile	Safari Mobile	Chrome for Android
Basic support	未实现	未实现	(Yes)	?	?	?	39	?	未实现

[1] Support for the devicechange event and for MediaDevices.ondevicechange landed in Firefox 51, but only for Mac, and disabled by default. It can be enabled by setting the preference media.ondevicechange.enabled to true. Support for this event was added for Linux and Windows—and it was enabled by default—starting in Firefox 52.

See also

• MediaDevices.ondevicechange