PerformanceServerTiming

注意: 此特征可用于 Web 工作者 .

Secure context
This feature is available only in secure contexts (HTTPS), in some or all supporting browsers .

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
A 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
A 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 Comment
Server Timing
The definition of 'PerformanceServerTiming' in that specification.
工作草案 初始定义。

浏览器兼容性

更新 GitHub 上的兼容性数据
Desktop Mobile
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
name
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