网络信息 API

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范例
接口
规范
浏览器兼容性
另请参阅
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。

The Network Information API provides information about the system's connection in terms of general connection type (e.g., 'wifi', 'cellular', etc.). This can be used to select high definition content or low definition content based on the user's connection. The entire API consists of the addition of the NetworkInformation interface and a single property to the Navigator 接口： Navigator.connection .

注意： 此特征可用于 Web 工作者 .

范例

Detect connection changes

This example watches for changes to the user's connection.

var connection = navigator.connection || navigator.mozConnection || navigator.webkitConnection;
var type = connection.effectiveType;
function updateConnectionStatus() {
  console.log("Connection type changed from " + type + " to " + connection.effectiveType);
  type = connection.effectiveType;
}
connection.addEventListener('change', updateConnectionStatus);

Preload large resources

The connection object is useful for deciding whether to preload resources that take large amounts of bandwidth or memory. This example would be called soon after page load to check for a connection type where preloading a video may not be desirable. If a cellular connection is found, then the preloadVideo flag is set to false . For simplicity and clarity, this example only tests for one connection type. A real-world use case would likely use a switch statement or some other method to check all of the possible values of NetworkInformation.type . Regardless of the type value you can get an estimate of connection speed through the NetworkInformation.effectiveType 特性。

let preloadVideo = true;
var connection = navigator.connection || navigator.mozConnection || navigator.webkitConnection;
if (connection) {
  if (connection.effectiveType === 'slow-2g') {
    preloadVideo = false;
  }
}

接口

NetworkInformation: Provides information about the connection a device is using to communicate with the network and provides a means for scripts to be notified if the connection type changes. The NetworkInformation interfaces cannot be instantiated. It is instead accessed through the Navigator 接口。

规范

规范	状态	注释
网络信息 API The definition of 'Network Information API' in that specification.	草案	Initial specification

浏览器兼容性

NetworkInformation

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
`NetworkInformation`	Chrome 61	Edge 79	Firefox No	IE No	Opera 48	Safari No	WebView Android 50	Chrome Android 38	Firefox Android 31	Opera Android 45	Safari iOS No	Samsung Internet Android 3.0
`downlink`	Chrome 61	Edge 79	Firefox No	IE No	Opera 48	Safari No	WebView Android 50	Chrome Android 38	Firefox Android ?	Opera Android 45	Safari iOS No	Samsung Internet Android 3.0
`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
`effectiveType`	Chrome 61	Edge 79	Firefox No	IE No	Opera 48	Safari No	WebView Android 50	Chrome Android 38	Firefox Android Yes	Opera Android 45	Safari iOS No	Samsung Internet Android 3.0
`onchange`	Chrome 61	Edge 79	Firefox No	IE No	Opera 48	Safari No	WebView Android 50	Chrome Android 38	Firefox Android No 不支持 No On Firefox, the event handler property corresponding to the `change` event is `ontypechange` .	Opera Android 45	Safari iOS No	Samsung Internet Android 3.0
`ontypechange`	Chrome No	Edge No	Firefox No	IE No	Opera ?	Safari No	WebView Android No	Chrome Android No	Firefox Android ?	Opera Android ?	Safari iOS No	Samsung Internet Android No
`rtt`	Chrome 61	Edge 79	Firefox No	IE No	Opera 48	Safari No	WebView Android 50	Chrome Android 38	Firefox Android No	Opera Android 45	Safari iOS No	Samsung Internet Android 3.0
`saveData`	Chrome 65	Edge 79	Firefox No	IE No	Opera Yes	Safari No	WebView Android 65	Chrome Android 65	Firefox Android ?	Opera Android Yes	Safari iOS No	Samsung Internet Android 9.0
`type`	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
Available in workers	Chrome 61	Edge 79	Firefox No	IE No	Opera 48	Safari No	WebView Android 50	Chrome Android 38	Firefox Android 53	Opera Android 45	Safari iOS No	Samsung Internet Android 3.0

图例

完整支持
不支持
兼容性未知 ?
实验。期望将来行为有所改变。

Navigator.connection

	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
`connection`	Chrome 61	Edge ≤79	Firefox Yes	IE No	Opera Yes	Safari No	WebView Android 50	Chrome Android 38	Firefox Android 14 14 The Network API is enabled by default. Can be disabled using the `dom.netinfo.enabled` preference.	Opera Android 37	Safari iOS No	Samsung Internet Android 3.0

图例

完整支持
不支持
实验。期望将来行为有所改变。

用户必须明确启用此特征。

另请参阅

元数据

最后修改： Aug 2, 2020

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范例