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• 句法
• 范例
• 规范
• 浏览器兼容性
• 相关话题

只读 sdpMLineIndex property on the RTCIceCandidate interface is a zero-based index of the m-line describing the media associated with the candidate.

This value is specified when creating the RTCIceCandidate by setting the corresponding sdpMLineIndex value in the RTCIceCandidateInit object when creating a new candidate with new RTCIceCandidate() .

If you instead call RTCIceCandidate() with a string parameter containing the candidate m-line text, the value of sdpMLineIndex is extracted from the m-line.

句法

var sdpMLineIndex = RTCIceCandidate.sdpMLineIndex;
					

值

A number containing a 0-based index into the set of m-lines providing media descriptions, indicating which media source is associated with the candidate, or null if no such association is available.

注意： Attempting to add a candidate (using addIceCandidate() ) that has a value of null for either sdpMid or sdpMLineIndex will throw a TypeError 异常。

范例

...

规范

规范	状态	注释
WebRTC 1.0: Real-time Communication Between Browsers The definition of 'RTCIceCandidate.sdpMLineIndex' in that specification.	候选推荐	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
sdpMLineIndex	Chrome 23	Edge 15	Firefox 22	IE 不支持 No	Opera 15	Safari Yes	WebView Android Yes	Chrome Android 25	Firefox Android Yes	Opera Android 14	Safari iOS Yes	Samsung Internet Android 1.5

图例

完整支持

完整支持

不支持

不支持

元数据

• 最后修改： Mar 18, 2019

相关话题

1. WebRTC API
2. RTCIceCandidate
3. 构造函数

   1. RTCIceCandidate()
4. 特性

   1. address
   2. candidate
   3. component
   4. foundation
   5. port
   6. priority
   7. 协议
   8. relatedAddress
   9. relatedPort
   10. sdpMid
   11. sdpMLineIndex
   12. usernameFragment
5. 方法

   1. toJSON()
6. Related pages for WebRTC

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