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 .

PerformanceServerTiming interface surfaces server metrics that are sent with the response in the Server-Timing HTTP header.

This interface is restricted to the same origin, but you can use the Timing-Allow-Origin header to specify the domains that are allowed to access the server metrics. Note that this interface is only available in secure contexts (HTTPS) in some browsers.

特性

PerformanceServerTiming.description 只读

DOMString value of the server-specified metric description, or an empty string.

PerformanceServerTiming.duration 只读

A double that contains the server-specified metric duration, or value 0.0 .

PerformanceServerTiming.name 只读

DOMString value of the server-specified metric name.

方法

PerformanceServerTiming.toJSON()

返回 DOMString that is the JSON representation of the PerformanceServerTiming 对象。

范例

Given a server that sends the Server-Timing header, for example a node.js server like this:

const http = require('http');
function requestHandler(request, response) {
  const headers = {
    'Server-Timing': `
      cache;desc="Cache Read";dur=23.2,
      db;dur=53,
      app;dur=47.2
    `.replace(/\n/g, '')
  };
  response.writeHead(200, headers);
  response.write('');
  return setTimeout(_ => {
   response.end();
 }, 1000)
};
http.createServer(requestHandler).listen(3000).on('error', console.error);
					

PerformanceServerTiming entries are now observable from JavaScript via the PerformanceResourceTiming.serverTiming 特性：

let entries = performance.getEntriesByType('resource');
console.log(entries[0].serverTiming);
// 0: PerformanceServerTiming {name: "cache", duration: 23.2, description: "Cache Read"}
// 1: PerformanceServerTiming {name: "db", duration: 53, description: ""}
// 2: PerformanceServerTiming {name: "app", duration: 47.2, description: ""}
					

规范

规范	状态	注释
Server Timing The definition of 'PerformanceServerTiming' in that specification.	工作草案	初始定义。

浏览器兼容性

The compatibility table in 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
PerformanceServerTiming	Chrome 65	Edge ≤79	Firefox 61	IE No	Opera 52	Safari ?	WebView Android 65	Chrome Android 65	Firefox Android 61	Opera Android 47	Safari iOS ?	Samsung Internet Android 9.0
description	Chrome 65	Edge ≤79	Firefox 61	IE No	Opera 52	Safari ?	WebView Android 65	Chrome Android 65	Firefox Android 61	Opera Android 47	Safari iOS ?	Samsung Internet Android 9.0
duration	Chrome 65	Edge ≤79	Firefox 61	IE No	Opera 52	Safari ?	WebView Android 65	Chrome Android 65	Firefox Android 61	Opera Android 47	Safari iOS ?	Samsung Internet Android 9.0
名称	Chrome 65	Edge ≤79	Firefox 61	IE No	Opera 52	Safari ?	WebView Android 65	Chrome Android 65	Firefox Android 61	Opera Android 47	Safari iOS ?	Samsung Internet Android 9.0
toJSON	Chrome 65	Edge ≤79	Firefox 61	IE No	Opera 52	Safari ?	WebView Android 65	Chrome Android 65	Firefox Android 61	Opera Android 47	Safari iOS ?	Samsung Internet Android 9.0

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。

另请参阅

• Server-Timing
• PerformanceResourceTiming.serverTiming

元数据

• 最后修改： Jan 29, 2020