HTMLMediaElement.videoTracks

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videoTracks 为 HTMLMediaElement 的只读属性，它是一个 VideoTrackList 列表，列表中包含相应媒体元素的视频轨, 视频轨为VideoTrack 类型对象。

它是一个实时列表; 当相应的媒体元素增加或删除视频轨时，返回列表会发生动态的改变。由此你可以监控和检测视频轨发生的变化。学习 Event handlers in VideoTrackList 可以获得更多关于media element 视频轨的知识.

Syntax

var videoTracks = mediaElement.videoTracks;

返回的是一个VideoTrackList 类型值，为相应媒体元素的视频轨列表。可以用访问数组的方法访问这个值，或 getTrackById() 方法访问它.

列表中包含的每一个 VideoTrack 代表其中的一个视频轨。

Specification	Status	Comment
HTML Living Standard HTMLMediaElement.videoTracks	Living Standard	No change from HTML5

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`videoTracks`	Chrome No support No	Edge Full support 12	Firefox Full support 33 Disabled Full support 33 Disabled Disabled From version 33: this feature is behind the `media.track.enabled` preference (needs to be set to `true`). To change preferences in Firefox, visit about:config.	IE ?	Opera ?	Safari Full support Yes	WebView Android ?	Chrome Android ?	Firefox Android Full support 33 Disabled Full support 33 Disabled Disabled From version 33: this feature is behind the `media.track.enabled` preference (needs to be set to `true`). To change preferences in Firefox, visit about:config.	Opera Android ?	Safari iOS ?	Samsung Internet Android ?

Full support: Full support
No support: No support
Compatibility unknown: Compatibility unknown
User must explicitly enable this feature.: User must explicitly enable this feature.