VideoTrackList.onremovetrack

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VideoTrackList onremovetrack event handler is called when the removetrack event occurs, indicating that a video track has been removed from the media element, and therefore also from the VideoTrackList .

The event is passed into the event handler in the form of a TrackEvent object, whose track property identifies the track that was removed from the media element's VideoTrackList .

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

句法

VideoTrackList.onremovetrack = eventHandler;

值

Set onremovetrack to a function that accepts as input a TrackEvent object which indicates in its track property which video track has been removed from the media element.

范例

This simple example just fetches the current number of video tracks in the media element whenever a track is removed from the media element.

document.querySelector("my-video").videoTracks.onremovetrack = function(event) {
  myTrackCount = document.querySelector("my-video").videoTracks.length;
};

The current number of video tracks remaining in the media element is obtained from VideoTrackList property length .

规范

规范	状态	注释
HTML 实时标准 The definition of 'VideoTrackList: onremovetrack' in that specification.	实时标准

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
`onremovetrack`	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

图例

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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