navigator.hardwareConcurrency

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注意： 此特征可用于 Web 工作者 .

navigator.hardwareConcurrency read-only property returns the number of logical processors available to run threads on the user's computer.

句法

logicalProcessors = window.navigator.hardwareConcurrency

值

A Number indicating the number of logical processor cores.

Modern computers have multiple physical processor cores in their CPU (two or four cores is typical), but each physical core is also usually able to run more than one thread at a time using advanced scheduling techniques. So a four-core CPU may offer eight logical processor cores , for example. The number of logical processor cores can be used to measure the number of threads which can effectively be run at once without them having to context switch.

The browser may, however, choose to report a lower number of logical cores in order to represent more accurately the number of Worker s that can run at once, so don't treat this as an absolute measurement of the number of cores in the user's system.

范例

In this example, one Worker is created for each logical processor reported by the browser and a record is created which includes a reference to the new worker as well as a Boolean value indicating whether or not we're using that worker yet; these objects are, in turn, stored into an array for later use. This creates a pool of workers we can use to process requests later.

let workerList = [];
for (let i = 0; i < window.navigator.hardwareConcurrency; i++) {
  let newWorker = {
    worker: new Worker('cpuworker.js'),
    inUse: false
  };
  workerList.push(newWorker);
}

规范

规范	状态	注释
HTML 实时标准 The definition of 'navigator.hardwareConcurrency' in that specification.	实时标准	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
`hardwareConcurrency`	Chrome 37	Edge 15	Firefox 48	IE ?	Opera 24	Safari ?	WebView Android 37	Chrome Android 37	Firefox Android 48	Opera Android 24	Safari iOS ?	Samsung Internet Android 3.0

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完整支持
兼容性未知 ?

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