在此页

• 额外特性
• 范例
• 规范
• 浏览器兼容性
• 相关事件
• 另请参阅
• 相关话题

loadedmetadata 事件被激发当元数据已加载。

冒泡	No
可取消	No
接口	事件
目标	元素
默认动作	None
事件处理程序特性	GlobalEventHandlers.onloadedmetadata
规范	HTML5 媒体

额外特性

特性	类型	描述
mozChannels 只读	int	通道数。
mozSampleRate 只读	int	每秒采样率。
mozFrameBufferLength 只读	int	在所有通道中采集的样本数。

范例

These examples add an event listener for the HTMLMediaElement's loadedmetadata event, then post a message when that event handler has reacted to the event firing.

使用 addEventListener() :

const video = document.querySelector('video');
video.addEventListener('loadedmetadata', (event) => {
  console.log('The duration and dimensions ' + '
      of the media and tracks are now known. ');
});
					

使用 onloadedmetadata 事件处理程序特性：

const video = document.querySelector('video');
video.onloadedmetadata = (event) => {
  console.log('The duration and dimensions ' + '
      of the media and tracks are now known. ');
};
					

规范

规范	状态
HTML 实时标准 在该规范中的 loadedmetadata media event 定义。	实时标准
HTML5 在该规范中的 canplay media event 定义。	推荐

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
loadedmetadata event	Chrome 3	Edge 12	Firefox 3.5	IE 9	Opera 10.5	Safari 3.1	WebView Android Yes	Chrome Android 18	Firefox Android 4	Opera Android Yes	Safari iOS Yes	Samsung Internet Android 1.0

图例

完整支持

完整支持

相关事件

• HTMLMediaElement: playing event
• HTMLMediaElement: waiting event
• HTMLMediaElement: seeking event
• HTMLMediaElement: seeked event
• HTMLMediaElement: ended event
• HTMLMediaElement: loadedmetadata event
• HTMLMediaElement: loadeddata event
• HTMLMediaElement: canplay event
• HTMLMediaElement: canplaythrough event
• HTMLMediaElement: durationchange event
• HTMLMediaElement: timeupdate event
• HTMLMediaElement: play event
• HTMLMediaElement: pause event
• HTMLMediaElement: ratechange event
• HTMLMediaElement: volumechange event
• HTMLMediaElement: suspend event
• HTMLMediaElement: emptied event
• HTMLMediaElement: stalled event

另请参阅

• HTMLAudioElement
• HTMLVideoElement
• <audio>
• <video>

• This event is part of gecko's Audio API extension

元数据

• 最后修改： Jul 27, 2020

相关话题

1. HTMLMediaElement
2. 特性

   1. audioTracks
   2. autoplay
   3. buffered
   4. controller
   5. controls
   6. controlsList
   7. crossOrigin
   8. currentSrc
   9. currentTime
   10. defaultMuted
   11. defaultPlaybackRate
   12. duration
   13. ended
   14. error
   15. initialTime
   16. loop
   17. mediaGroup
   18. muted
   19. networkState
   20. onerror
   21. paused
   22. playbackRate
   23. readyState
   24. seekable
   25. sinkId
   26. src
   27. srcObject
   28. textTracks
   29. videoTracks
   30. volume
3. 方法

   1. canPlayType()
   2. captureStream()
   3. fastSeek()
   4. load()
   5. msInsertAudioEffect()
   6. pause()
   7. play()
   8. seekToNextFrame()
   9. setMediaKeys()
   10. setSinkId()
4. 事件

   1. abort
   2. canplay
   3. canplaythrough
   4. durationchange
   5. emptied
   6. ended
   7. error
   8. loadeddata
   9. loadedmetadata
   10. loadstart
   11. pause
   12. play
   13. progress
   14. ratechange
   15. seeked
   16. seeking
   17. stalled
   18. suspend
   19. timeupdate
   20. volumechange
   21. waiting
5. 继承：

   1. HTMLElement
   2. 元素
   3. 节点
   4. EventTarget