RTCDataChannel.bufferedAmount

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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 bufferedAmount returns the number of bytes of data currently queued to be sent over the data channel. The queue may build up as a result of calls to the send() method. This only includes data buffered by the user agent itself; it doesn't include any framing overhead or buffering done by the operating system or network hardware.

The user agent may implement the process of actually sending data in any way it chooses; this may be done periodically during the event loop or truly asynchronously. As messages are actually sent, this value is reduced accordingly.

Closing the data channel doesn't reset this count, even though the user agent purges the queued messages. However, even after closing the channel, attempts to send messages continue to add to the bufferedAmount value, even though the messages are neither sent nor buffered.

Whenever this value decreases to fall to or below the value specified in the bufferedAmountLowThreshold property, the user agent fires the bufferedamountlow event. This event may be used, for example, to implement code which queues more messages to be sent whenever there's room to buffer them.

句法

var amount = aDataChannel.bufferedAmount;

值

The number of bytes of data currently queued to be sent over the data channel but have not yet been sent.

范例

The snippet below includes a function which changes the contents of a block with the ID "bufferSize" to a string indicating the number of bytes currently buffered on an RTCDataChannel .

var dc = peerConnection.createDataChannel("File Transfer");

/* ... */
function showBufferedAmount(channel) {
  let el = document.getElementbyId("bufferSize");
  el.innerHTML = channel.bufferedAmount + " bytes";
}

规范

规范	状态	注释
WebRTC 1.0: Real-time Communication Between Browsers The definition of 'RTCDataChannel.bufferedAmount' 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
`bufferedAmount`	Chrome 56	Edge ≤79	Firefox 18	IE No	Opera 43	Safari Yes	WebView Android 56	Chrome Android 56	Firefox Android 18	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

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句法

值

范例

规范

浏览器兼容性

图例

另请参阅

相关话题