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• 句法
• 规范
• 浏览器兼容性
• 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。

downlink 只读特性在 NetworkInformation interface returns the effective bandwidth estimate in megabits per second, rounded to the nearest multiple of 25 kilobits per seconds. This value is based on recently observed application layer throughput across recently active connections, excluding connections made to a private address space. In the absence of recent bandwidth measurement data, the attribute value is determined by the properties of the underlying connection technology.

Note that Chrome-based browsers do not conform to the specification, and arbitrarily cap the reported downlink at a maximum of 10 Mbps as an anti-fingerprinting measure. Similar caps exist for the reported latency.

句法

var downLink = NetworkInformation.downlink
					

值

A double .

规范

规范	状态	注释
网络信息 API The definition of 'downlink' in that specification.	草案	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
downlink	Chrome 61	Edge 79	Firefox 不支持 No	IE 不支持 No	Opera 48	Safari 不支持 No	WebView Android 50	Chrome Android 38	Firefox Android ?	Opera Android 45	Safari iOS 不支持 No	Samsung Internet Android 3.0

图例

完整支持

完整支持

不支持

不支持

兼容性未知 ?

兼容性未知

实验。期望将来行为有所改变。

实验。期望将来行为有所改变。

元数据

• 最后修改： Jun 23, 2020

相关话题

1. 网络信息 API
2. NetworkInformation
3. 特性

   1. downlink
   2. downlinkMax
   3. onchange
   4. rtt
   5. saveData
   6. type
4. 继承：

   1. EventTarget
5. Related pages for Network Information API

   1. Navigator.connection