在此页

• Accessing device memory capacity
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

安全上下文
此特征只可用于 安全上下文 (HTTPS)，在某些或所有 支持浏览器 .

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。

Capabilities of the client devices largely depend on the amount of available RAM. Traditionally, developrs had to use heruistics and either benchmark the device or infer the device capabilities based on other factors like device manufacturer or User Agent strings.

Accessing device memory capacity

There are two ways to acces the approximate amount of RAM device has: via JavaScript API and via Client Hints HTTP header.

JavaScript API

You may query the approximate amount of ram device has by retreiving Navigator.deviceMemory

var ram1 = window.navigator.deviceMemory;
var ram2 = navigator.deviceMemory;
					

Both of these will return the same result.

Client Hints Header

You also may use Client Hints directive Device-Memory to retreive the same approximate RAM capacity.

规范

规范	状态	注释
Device Memory 1	编者草案	初始定义。

浏览器兼容性

JavaScript interface

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
deviceMemory	Chrome 63	Edge ≤79	Firefox ?	IE ?	Opera 50	Safari ?	WebView Android 63	Chrome Android 63	Firefox Android ?	Opera Android 46	Safari iOS ?	Samsung Internet Android 8.0

图例

完整支持

完整支持

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。

Client Hints extension

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
Device-Memory	Chrome 61	Edge ≤79	Firefox ?	IE ?	Opera 48	Safari ?	WebView Android 61	Chrome Android 61	Firefox Android ?	Opera Android ?	Safari iOS ?	Samsung Internet Android 8.0

图例

完整支持

完整支持

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。

另请参阅

• Navigator.deviceMemory
• Device-Memory header

元数据

• 最后修改： Sep 29, 2019