TrackEvent() | Web API

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TrackEvent() constructor creates and returns a new TrackEvent object describing an event which occurred on a list of tracks ( AudioTrackList , VideoTrackList ，或 TextTrackList ).

句法

trackEvent = new TrackEvent(type, eventInfo);

参数

type

The type of track event which is described by the object:


								"addtrack"


								"removetrack"

eventInfo 可选

An optional dictionary providing additional information configuring the new event; it can contain the following fields in any combination:

track 可选: The track to which the event refers; this is null by default, but should be set to a VideoTrack , AudioTrack ，或 TextTrack as appropriate given the type of track.
bubbles 可选
cancelable 可选
composed 可选: A Boolean indicating whether or not the event will trigger listeners outside of a shadow root; see Event.composed 了解更多细节。

返回值

A newly-created TrackEvent object, initialized as described by the inputs to the constructor.

规范

规范	状态	注释
HTML 实时标准 The definition of 'TrackEvent()' in that specification.	实时标准	初始定义。
HTML5 The definition of 'TrackEvent()' in that specification.	推荐	初始定义。

浏览器兼容性

The compatibility table on 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.

No compatibility data found. Please contribute data for "api.TrackEvent.TrackEvent" (depth: 1) to the MDN 兼容性数据存储库 .

元数据

最后修改： Mar 18, 2019

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句法

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返回值

规范

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