在此页

• 句法
• 规范
• 浏览器兼容性
• 相关话题

这是 实验性技术
检查 浏览器兼容性表格 要小心谨慎在生产中使用这之前。

MediaKeySession.expiration read-only property returns the time after which the keys in the current session can no longer be used to decrypt media data, or NaN if no such time exists. This value is determined by the CDM and measured in milliseconds since January 1, 1970, UTC. This value may change during a session lifetime, such as when an action triggers the start of a window.

句法

​var expirationTime = mediaKeySessionObj.expiration;
					

规范

规范	状态	注释
加密媒体扩展 The definition of 'expiration' 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. 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
expiration	Chrome 42	Edge 13	Firefox Yes	IE ?	Opera Yes	Safari ?	WebView Android 43	Chrome Android 42	Firefox Android Yes	Opera Android Yes	Safari iOS ?	Samsung Internet Android 4.0

图例

完整支持

完整支持

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。

元数据

• 最后修改： 2020 年 1 月 22 日

相关话题

1. MediaKeySession
2. 特性

   1. closed
   2. expiration
   3. keyStatuses
   4. sessionId
3. 方法

   1. close()
   2. generateRequest()
   3. load()
   4. remove()
   5. update()
4. 继承：

   1. EventTarget