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• 句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

MediaRecorder.requestData() method (part of the MediaRecorder API ) is used to raise a dataavailable event containing a Blob object of the captured media as it was when the method was called. This can then be grabbed and manipulated as you wish.

当 requestData() method is invoked, the browser queues a task that runs the following steps:

1. 若 MediaRecorder.state is not "recording", raise a DOM InvalidState error and terminate these steps. If MediaRecorder.state is "recording", continue to the next step.
2. 引发 dataavailable event containing a Blob of the currently captured data (the Blob is available under the event's data attribute.)
3. Create a new Blob and place subsequently captured data into it.

句法

MediaRecorder.requestData()
					

错误

An InvalidState error is raised if the requestData() method is called while the MediaRecorder 对象的 MediaRecorder.state is not "recording" — the media cannot be captured if recording is not occurring.

范例

...
  captureMedia.onclick = function() {
    mediaRecorder.requestData();
    // makes snapshot available of data so far
    // ondataavailable fires, then capturing continues
    // in new Blob
  }
...
					

规范

规范	状态	注释
MediaStream 录制 The definition of 'MediaRecorder.requestData()' in that specification.	工作草案	初始定义

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
requestData	Chrome 49	Edge 79	Firefox 25	IE No	Opera 36	Safari No	WebView Android 49	Chrome Android 49	Firefox Android 25	Opera Android 36	Safari iOS No	Samsung Internet Android 5.0

图例

完整支持

完整支持

不支持

不支持

另请参阅

• Using the MediaRecorder API
• Web Dictaphone : MediaRecorder + getUserMedia + Web Audio API visualization demo, by Chris Mills ( source on Github )。
• simpl.info MediaStream Recording demo , by Sam Dutton .
• Navigator.getUserMedia

元数据

• 最后修改： 2020 年 1 月 22 日

相关话题

1. MediaStream 录制 API
2. MediaRecorder
3. 构造函数

   1. MediaRecorder()
4. 特性

   1. audioBitsPerSecond
   2. ignoreMutedMedia
   3. mimeType
   4. ondataavailable
   5. onerror
   6. onpause
   7. onresume
   8. onstart
   9. onstop
   10. onwarning
   11. state
   12. stream
5. 方法

   1. isTypeSupported
   2. pause()
   3. requestData()
   4. resume()
   5. start()
   6. stop()
6. 事件

   1. error
7. 继承：

   1. EventTarget
8. Related pages for MediaStream Recording

   1. BlobEvent
   2. MediaRecorderErrorEvent