<div id="interfaceDiagram" style="display: inline-block; position: relative; width: 100%; padding-bottom: 11.666666666666666%; vertical-align: middle; overflow: hidden;"><svg style="display: inline-block; position: absolute; top: 0; left: 0;" viewbox="-50 0 600 70" preserveAspectRatio="xMinYMin meet"><a xlink:href="../API/PerformanceEntry" target="_top"><rect x="1" y="1" width="160" height="50" fill="#fff" stroke="#D4DDE4" stroke-width="2px" /><text  x="81" y="30" font-size="12px" font-family="Consolas,Monaco,Andale Mono,monospace" fill="#4D4E53" text-anchor="middle" alignment-baseline="middle">PerformanceEntry</text></a><polyline points="161,25  171,20  171,30  161,25" stroke="#D4DDE4" fill="none"/><line x1="171" y1="25" x2="201" y2="25" stroke="#D4DDE4"/><a xlink:href="../API/PerformanceResourceTiming" target="_top"><rect x="201" y="1" width="250" height="50" fill="#F4F7F8" stroke="#D4DDE4" stroke-width="2px" /><text  x="326" y="30" font-size="12px" font-family="Consolas,Monaco,Andale Mono,monospace" fill="#4D4E53" text-anchor="middle" alignment-baseline="middle">PerformanceResourceTiming</text></a></svg></div>
					

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注意： 此特征可用于 Web 工作者 .

特性

This interface extends the following PerformanceEntry properties for resource performance entry types by qualifying and constraining them as follows:

PerformanceEntry.entryType 只读

返回 "resource" .

PerformanceEntry.name 只读

Returns the resources URL.

PerformanceEntry.startTime 只读

返回 timestamp for the time a resource fetch started. This value is equivalent to PerformanceEntry.fetchStart .

PerformanceEntry.duration 只读

返回 timestamp that is the difference between the responseEnd 和 startTime 特性。

The interface also supports the following properties which are listed in the order in which they are recorded for the fetching of a single resource. An alphabetical listing is shown in the navigation, at left.

PerformanceResourceTiming.initiatorType 只读

string 表示 type of resource that initiated the performance entry, as specified in PerformanceResourceTiming.initiatorType .

PerformanceResourceTiming.nextHopProtocol 只读

string 表示 network protocol used to fetch the resource, as identified by the ALPN Protocol ID (RFC7301) .

PerformanceResourceTiming.workerStart 只读

返回 DOMHighResTimeStamp immediately before dispatching the FetchEvent if a Service Worker thread is already running, or immediately before starting the Service Worker thread if it is not already running. If the resource is not intercepted by a Service Worker the property will always return 0.

PerformanceResourceTiming.redirectStart 只读

DOMHighResTimeStamp that represents the start time of the fetch which initiates the redirect.

PerformanceResourceTiming.redirectEnd 只读

DOMHighResTimeStamp immediately after receiving the last byte of the response of the last redirect.

PerformanceResourceTiming.fetchStart 只读

DOMHighResTimeStamp immediately before the browser starts to fetch the resource.

PerformanceResourceTiming.domainLookupStart 只读

DOMHighResTimeStamp immediately before the browser starts the domain name lookup for the resource.

PerformanceResourceTiming.domainLookupEnd 只读

DOMHighResTimeStamp representing the time immediately after the browser finishes the domain name lookup for the resource.

PerformanceResourceTiming.connectStart 只读

DOMHighResTimeStamp immediately before the browser starts to establish the connection to the server to retrieve the resource.

PerformanceResourceTiming.connectEnd 只读

DOMHighResTimeStamp immediately after the browser finishes establishing the connection to the server to retrieve the resource.

PerformanceResourceTiming.secureConnectionStart 只读

DOMHighResTimeStamp immediately before the browser starts the handshake process to secure the current connection.

PerformanceResourceTiming.requestStart 只读

DOMHighResTimeStamp immediately before the browser starts requesting the resource from the server.

PerformanceResourceTiming.responseStart 只读

DOMHighResTimeStamp immediately after the browser receives the first byte of the response from the server.

PerformanceResourceTiming.responseEnd 只读

DOMHighResTimeStamp immediately after the browser receives the last byte of the resource or immediately before the transport connection is closed, whichever comes first.

PerformanceResourceTiming.transferSize 只读

A 编号 representing the size (in octets) of the fetched resource. The size includes the response header fields plus the response payload body.

PerformanceResourceTiming.encodedBodySize 只读

A 编号 representing the size (in octets) received from the fetch (HTTP or cache), of the payload body , before removing any applied content-codings.

PerformanceResourceTiming.decodedBodySize 只读

A 编号 that is the size (in octets) received from the fetch (HTTP or cache) of the message body , after removing any applied content-codings.

PerformanceResourceTiming.serverTiming 只读

An array of PerformanceServerTiming entries containing server timing metrics.

方法

PerformanceResourceTiming.toJSON()

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

范例

See the example in 使用资源计时 API .

规范

规范	状态	注释
Resource Timing Level 1 The definition of 'PerformanceResourceTiming' in that specification.	候选推荐	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
PerformanceResourceTiming	Chrome 43	Edge 12	Firefox 40	IE 10	Opera 30	Safari 11	WebView Android 43	Chrome Android 43	Firefox Android 42	Opera Android 30	Safari iOS 11	Samsung Internet Android 4.0
connectEnd	Chrome 43	Edge 12	Firefox 40	IE 10	Opera 32	Safari 11	WebView Android 43	Chrome Android 43	Firefox Android 42	Opera Android 32	Safari iOS 11	Samsung Internet Android 4.0
connectStart	Chrome 43	Edge 12	Firefox 40	IE 10	Opera 32	Safari 11	WebView Android 43	Chrome Android 43	Firefox Android 42	Opera Android 32	Safari iOS 11	Samsung Internet Android 4.0
decodedBodySize	Chrome 54	Edge 17	Firefox 45	IE No	Opera 41	Safari No	WebView Android 54	Chrome Android 54	Firefox Android 45	Opera Android 41	Safari iOS No	Samsung Internet Android 6.0
domainLookupEnd	Chrome 43	Edge 12	Firefox 40	IE No	Opera 30	Safari 11	WebView Android 43	Chrome Android 43	Firefox Android 42	Opera Android 30	Safari iOS 11	Samsung Internet Android 4.0
domainLookupStart	Chrome 43	Edge 12	Firefox 40	IE No	Opera 30	Safari 11	WebView Android 43	Chrome Android 43	Firefox Android 42	Opera Android 30	Safari iOS 11	Samsung Internet Android 4.0
encodedBodySize	Chrome 54	Edge 17	Firefox 45	IE No	Opera 41	Safari No	WebView Android 54	Chrome Android 54	Firefox Android 45	Opera Android 41	Safari iOS No	Samsung Internet Android 6.0
fetchStart	Chrome 43	Edge 12	Firefox 40	IE No	Opera 30	Safari 11	WebView Android 43	Chrome Android 43	Firefox Android 42	Opera Android 30	Safari iOS 11	Samsung Internet Android 4.0
initiatorType	Chrome 43	Edge 12	Firefox 40	IE No	Opera 30	Safari 11	WebView Android 43	Chrome Android 43	Firefox Android 42	Opera Android 30	Safari iOS 11	Samsung Internet Android 4.0
nextHopProtocol	Chrome 61	Edge 17	Firefox 45	IE No	Opera No	Safari No	WebView Android 61	Chrome Android 61	Firefox Android 45	Opera Android No	Safari iOS No	Samsung Internet Android 8.0
redirectEnd	Chrome 43	Edge 12	Firefox 40	IE No	Opera 30	Safari 11	WebView Android 43	Chrome Android 43	Firefox Android 42	Opera Android 30	Safari iOS 11	Samsung Internet Android 4.0
redirectStart	Chrome 43	Edge 12	Firefox 40	IE No	Opera 30	Safari 11	WebView Android 43	Chrome Android 43	Firefox Android 42	Opera Android 30	Safari iOS 11	Samsung Internet Android 4.0
requestStart	Chrome 43	Edge 12	Firefox 40	IE No	Opera 30	Safari 11	WebView Android 43	Chrome Android 43	Firefox Android 42	Opera Android 30	Safari iOS 11	Samsung Internet Android 4.0
responseEnd	Chrome 43	Edge 12	Firefox 40	IE No	Opera 30	Safari 11	WebView Android 43	Chrome Android 43	Firefox Android 42	Opera Android 30	Safari iOS 11	Samsung Internet Android 4.0
responseStart	Chrome 43	Edge 12	Firefox 40	IE No	Opera 30	Safari 11	WebView Android 43	Chrome Android 43	Firefox Android 42	Opera Android 30	Safari iOS 11	Samsung Internet Android 4.0
secureConnectionStart	Chrome 43	Edge 18	Firefox 40	IE No	Opera 30	Safari 11	WebView Android 43	Chrome Android 43	Firefox Android 42	Opera Android 30	Safari iOS 11	Samsung Internet Android 4.0
serverTiming	Chrome 65	Edge ≤79	Firefox 61	IE No	Opera 52	Safari No	WebView Android 65	Chrome Android 65	Firefox Android 61	Opera Android 47	Safari iOS No	Samsung Internet Android 9.0
toJSON	Chrome 43	Edge ≤18	Firefox 40	IE No	Opera 30	Safari 11	WebView Android 43	Chrome Android 43	Firefox Android 42	Opera Android 30	Safari iOS 11	Samsung Internet Android 4.0
transferSize	Chrome 54	Edge 17	Firefox 45	IE No	Opera 41	Safari No	WebView Android 54	Chrome Android 54	Firefox Android 45	Opera Android 41	Safari iOS No	Samsung Internet Android 6.0
Available in workers	Chrome 43	Edge ≤18	Firefox 60	IE No	Opera 32	Safari 12	WebView Android 43	Chrome Android 43	Firefox Android 60	Opera Android 32	Safari iOS No	Samsung Internet Android 4.0
workerStart	Chrome 43	Edge 16	Firefox 58	IE No	Opera 32	Safari 11	WebView Android 43	Chrome Android 43	Firefox Android 58	Opera Android 32	Safari iOS 11	Samsung Internet Android 4.0

图例

完整支持

完整支持

不支持

不支持

另请参阅

• Resource Timing (Overview)
• 使用资源计时 API

元数据

• 最后修改： Oct 13, 2019