RTCDataChannel.readyState

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句法
范例
规范
浏览器兼容性
另请参阅
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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 readyState returns an enum of type RTCDataChannelState which indicates the state of the data channel's underlying data connection.

句法

var state = aDataChannel.readyState;

值

A string which is one of the values in the RTCDataChannelState enum, indicating the current state of the underlying data transport.

RTCDataChannelState enum

RTCDataChannelState enum defines string constants which reflect the current status of the RTCDataChannel 's underlying data connection.

常量	描述
`"connecting"`	The user agent (browser) is in the process of creating the underlying data transport; that is, whatever network level connection is used to link the two peers together is in the process of being set up. This is the state of a new `RTCDataChannel` after being created by `RTCPeerConnection.createDataChannel()` (on the peer which started the connection process).
`"open"`	The underlying data transport has been established and data can be transferred bidirectionally across it. This is the default state of a new `RTCDataChannel` created by the WebRTC layer when the remote peer created the channel and delivered to the site or app in a `datachannel` event of type `RTCDataChannelEvent` .
`"closing"`	The process of closing the underlying data transport has begun. It is no longer possible to queue new messages to be sent, but previously queued messages may still be send or received before entering the `"closed"` 状态。
`"closed"`	The underlying data transport has closed, or the attempt to make the connection failed.

范例

var dataChannel = peerConnection.createDataChannel("File Transfer");
var sendQueue = [];
function sendMessage(msg) {
  switch(dataChannel.readyState) {
    case "connecting":
      console.log("Connection not open; queueing: " + msg);
      sendQueue.push(msg);
      break;
    case "open":
      sendQueue.forEach((msg) => dataChannel.send(msg));
      break;
    case "closing":
      console.log("Attempted to send message while closing: " + msg);
      break;
    case "closed":
      console.log("Error! Attempt to send while connection closed.");
      break;
  }
}

规范

规范	状态	注释
WebRTC 1.0: Real-time Communication Between Browsers The definition of 'RTCDataChannel.readyState' 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
`readyState`	Chrome 56	Edge ≤79	Firefox Yes	IE No	Opera 43	Safari No	WebView Android 56	Chrome Android 56	Firefox Android Yes	Opera Android 43	Safari iOS No	Samsung Internet Android 6.0

图例

完整支持
不支持
实验。期望将来行为有所改变。

另请参阅

元数据

最后修改： 2019 年 3 月 23 日

WebRTC API
RTCDataChannel
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~~
方法
1. close()
2. send()
继承：
1. EventTarget
Related pages for WebRTC

在此页

句法

值

RTCDataChannelState enum

范例

规范

浏览器兼容性

图例

另请参阅

相关话题