AudioTrackList.onaddtrack

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AudioTrackList property onaddtrack is an event handler which is called when the addtrack event occurs, indicating that a new audio track has been added to the media element whose audio tracks the AudioTrackList represents.

The event is passed into the event handler in the form of a TrackEvent object, whose track property identifies the newly-added track.

注意： You can also add a handler for the addtrack event using addEventListener() .

句法

AudioTrackList.onaddtrack = eventHandler;

值

Set onaddtrack to a function that accepts as input a TrackEvent object which indicates in its track property which audio track has been added to the media.

用法注意事项

addtrack event is called whenever a new track is added to the media element whose audio tracks are represented by the AudioTrackList object. This happens when tracks are added to the element when the media is first attached to the element; one addtrack event will occur for each audio track in the media resource.

范例

This snippet establishes a handler for the addtrack event that calls a function, addToTrackList() , passing in the AudioTrack object representing the newly-added track. In this scenario, that function's role is to add the new track to a list of audio tracks available to choose from.

document.querySelector("video").audioTracks.onaddtrack = function(event) {
  addToTrackList(event.track);
};

规范

规范	状态	注释
HTML 实时标准 The definition of 'AudioTrackList.onaddtrack' in that specification.	实时标准
HTML5 The definition of 'AudioTrackList.onaddtrack' in that specification.	推荐

浏览器兼容性

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`onaddtrack`	Chrome 45 Disabled 45 Disabled Disabled From version 45: this feature is behind the `enable-experimental-web-platform-features` preference (needs to be set to `enabled` ). To change preferences in Chrome, visit chrome://flags.	Edge 79 Disabled 79 Disabled Disabled From version 79: this feature is behind the `enable-experimental-web-platform-features` preference (needs to be set to `enabled` ). 不支持 12 — 79	Firefox 33	IE 10	Opera 32 Disabled 32 Disabled Disabled From version 32: this feature is behind the `enable-experimental-web-platform-features` preference (needs to be set to `enabled` ).	Safari 6.1	WebView Android 45	Chrome Android 45 Disabled 45 Disabled Disabled From version 45: this feature is behind the `enable-experimental-web-platform-features` preference (needs to be set to `enabled` ). To change preferences in Chrome, visit chrome://flags.	Firefox Android 33	Opera Android 32 Disabled 32 Disabled Disabled From version 32: this feature is behind the `enable-experimental-web-platform-features` preference (needs to be set to `enabled` ).	Safari iOS 7	Samsung Internet Android No

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完整支持
不支持
用户必须明确启用此特征。

元数据

最后修改： Mar 18, 2019

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