在此页

• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

A bufferedamountlow event is sent to an RTCDataChannel when the number of bytes currently in the outbound data transfer buffer falls below the threshold specified in bufferedAmountLowThreshold . bufferedamountlow events aren't sent if bufferedAmountLowThreshold 为 0。

冒泡	No
可取消	No
接口	事件
事件处理程序特性	onbufferedamountlow

范例

This example sets up a handler for bufferedamountlow to request more data any time the data channel's buffer falls below the number of bytes specified by bufferedAmountLowThreshold , which we have set to 65536. In other words, we'll try to keep at least 64kB of data in the buffer, reading 64kB at a time from the source.

let pc = new RTCPeerConnection();
let dc = pc.createDataChannel("SendFile");
let source = /* source data object */
dc.bufferedAmountLowThreshold = 65536;
pc.addEventListener("bufferedamountlow", ev => {
  if (source.position <= source.length) {
    dc.send(source.readFile(65536));
  }
}, false);
					

After creating the RTCPeerConnection , this calls RTCPeerConnection.createDataChannel() to create the data channel. Then a listener is created for bufferedamountlow to refill the incoming data buffer any time its contents fall below 65536 bytes.

You can also set up a listener for bufferedamountlow using its event handler property, onbufferedamountlow :

pc.onbufferedamountlow = ev => {
  if (source.position <= source.length) {
    dc.send(source.readFile(65536));
  }
}
					

规范

规范	状态	注释
WebRTC 1.0: Real-time Communication Between Browsers The definition of 'bufferedamountlow' in that specification.	候选推荐

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
bufferedamountlow event	Chrome 57 57 默认为 rtcpMuxPolicy is require .	Edge ≤79 ≤79 默认为 rtcpMuxPolicy is require .	Firefox Yes	IE No	Opera 44 44 默认为 rtcpMuxPolicy is require .	Safari Yes	WebView Android 57 57 默认为 rtcpMuxPolicy is require .	Chrome Android 57 57 默认为 rtcpMuxPolicy is require .	Firefox Android Yes	Opera Android 43 43 默认为 rtcpMuxPolicy is require .	Safari iOS No	Samsung Internet Android 7.0 7.0 默认为 rtcpMuxPolicy is require .

图例

完整支持

完整支持

不支持

不支持

见实现注意事项。

另请参阅

• WebRTC API
• RTCDataChannel
• RTCDataChannel.onbufferedamountlow
• RTCDataChannel.bufferedAmountLowThreshold

元数据

• 最后修改： Mar 18, 2019

相关话题

1. WebRTC API
2. RTCDataChannel
3. 特性

   1. binaryType
   2. bufferedAmount
   3. bufferedAmountLowThreshold
   4. id
   5. label
   6. maxPacketLifeTime
   7. maxRetransmits
   8. negotiated
   9. onbufferedamountlow
   10. onclose
   11. onclosing
   12. onerror
   13. onmessage
   14. onopen
   15. ordered
   16. 协议
   17. readyState
   18. reliable
   19. stream
4. 方法

   1. close()
   2. send()
5. 继承：

   1. EventTarget
6. Related pages for WebRTC

   1. MediaDevices.getUserMedia()
   2. Navigator.mediaDevices
   3. RTCCertificate
   4. RTCDTMFSender
   5. RTCDTMFToneChangeEvent
   6. RTCDataChannelEvent
   7. RTCDtlsTransport
   8. RTCErrorEvent
   9. RTCIceCandidate
   10. RTCIceTransport
   11. RTCPeerConnection
   12. RTCPeerConnectionIceErrorEvent
   13. RTCPeerConnectionIceEvent
   14. RTCRtpReceiver
   15. RTCRtpSender
   16. RTCRtpTransceiver
   17. RTCSctpTransport
   18. RTCSessionDescription
   19. RTCStatsEvent
   20. RTCStatsReport
   21. RTCTrackEvent