在此页

• 句法
• 范例
• 浏览器兼容性
• 另请参阅
• 相关话题

过时
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.

TrackDefault() getter method of the TrackDefaultList interface allows the TrackDefault objects in the list to be accessed with an array operator (i.e. [] )。

句法

var myTrackDefault = TrackDefaultList[index];
					

参数

index

The index position of the TrackDefault object you want to return.

返回

A TrackDefault 对象。

错误

No specific errors are returned, but if the supplied index is great than or equal to TrackDefaultList.length , the operation will return undefined .

范例

TBD.

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. 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
TrackDefault 非标	Chrome ?	Edge ≤18	Firefox 不支持 No	IE ?	Opera ?	Safari ?	WebView Android ?	Chrome Android ?	Firefox Android 不支持 No	Opera Android ?	Safari iOS 不支持 No	Samsung Internet Android ?

图例

完整支持

完整支持

不支持

不支持

兼容性未知 ?

兼容性未知

实验。期望将来行为有所改变。

实验。期望将来行为有所改变。

非标。预期跨浏览器支持较差。

非标。预期跨浏览器支持较差。

另请参阅

• MediaSource
• SourceBuffer
• TrackDefaultList

元数据

• 最后修改： Dec 25, 2019

相关话题

1. Media Source Extensions API
2. TrackDefaultList
3. 构造函数

   1. TrackDefaultList()
4. 特性

   1. length
5. 方法

   1. TrackDefault()
6. Related pages for Media Source Extensions

   1. HTMLVideoElement.getVideoPlaybackQuality()
   2. MediaSource
   3. SourceBuffer
   4. SourceBufferList
   5. TextTrack.sourceBuffer
   6. TrackDefault
   7. URL.createObjectURL()
   8. VideoPlaybackQuality
   9. VideoTrack.sourceBuffer