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。

NetworkInformation.downlinkMax read-only property returns the maximum downlink speed, in megabits per second (Mbps), for the underlying connection technology.

注意: 此特征可用于 Web 工作者 .

句法

var max = NetworkInformation.downlinkMax
					

返回值

  • an unrestricted double representing the maximum downlink speed, in megabits per second (Mb/s), for the underlying connection technology.

范例

The following example monitors the connection using the change event and logs changes as they occur.

function logConnectionType() {
  var connectionType = 'not supported';
  var downlinkMax = 'not supported';
  if ('connection' in navigator) {
    connectionType = navigator.connection.effectiveType;
    if ('downlinkMax' in navigator.connection) {
      downlinkMax = navigator.connection.downlinkMax;
    }
  }
  console.log('Current connection type: ' + connectionType +
    ' (downlink max: ' + downlinkMax + ')');
}
logConnectionType();
navigator.connection.addEventListener('change', logConnectionType);
					

规范

规范 状态 注释
网络信息 API
The definition of 'downlinkMax' 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
downlinkMax Chrome 61
61
Only supported in Chrome OS
Edge No Firefox No IE No Opera No Safari No WebView Android 50 Chrome Android 38 Firefox Android No Opera Android 45 Safari iOS No Samsung Internet Android 3.0

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。

见实现注意事项。

元数据

  • 最后修改:
  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