在此页

• 句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 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。

只读 RTCDataChannel property id returns an ID number (between 0 and 65,534) which uniquely identifies the RTCDataChannel . This ID is set at the time the data channel is created, either by the user agent (if RTCDataChannel.negotiated is false ) or by the site or app script (if negotiated is true ).

每个 RTCPeerConnection can therefore have up to a theoretical maximum of 65,534 data channels on it, although the actual maximum may vary from browser to browser.

In early versions of the WebRTC specification, this property's name was stream . Code that uses that property needs to be updated.

句法

var id = aDataChannel.id;
					

值

An unsigned short value (that is, an integer between 0 and 65,535) which uniquely identifies the data channel.

While the label property doesn't have to be unique, this ID number is guaranteed to be unique among all data channels. Additionally, known implementations of WebRTC use the same ID on both peers. A unique ID makes it easier for your code to do its own out-of-band data channel-related signaling.

This can be also useful for logging and debugging purposes.

范例

var pc = new RTCPeerConnection();
var dc = pc.createDataChannel("my channel");

console.log("Channel id: " + dc.id);
					

规范

规范	状态	注释
WebRTC 1.0: Real-time Communication Between Browsers The definition of 'RTCDataChannel.id' in that specification.	候选推荐	最初的规范。

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
id	Chrome 56	Edge ≤79	Firefox No	IE No	Opera 43	Safari No	WebView Android 56	Chrome Android 56	Firefox Android No	Opera Android 43	Safari iOS No	Samsung Internet Android 6.0

图例

完整支持

完整支持

不支持

不支持

实验。期望将来行为有所改变。

实验。期望将来行为有所改变。

另请参阅

• WebRTC
• RTCDataChannel
• RTCPeerConnection.createDataChannel()

元数据

• 最后修改： 2020 年 1 月 22 日

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