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The Performance interface provides access to performance-related information for the current page. It's part of the High Resolution Time API, but is enhanced by the Performance Timeline API, the Navigation Timing API, the User Timing API, and the Resource Timing API.
An object of this type can be obtained by calling the Window.performance read-only attribute.
Note: This interface and its members are available in Web Workers, except where indicated below. Also note that performance markers and measures are per context. If you create a mark on the main thread (or other worker), you cannot see it in a worker thread, and vice versa.
Properties
The Performance interface doesn't inherit any properties.
Performance.navigationRead only Not available to workers- A
PerformanceNavigationobject that provides useful context about the operations included in the times listed intiming, including whether the page was a load or a refresh, how many redirections occurred, and so forth. Performance.timingRead only Not available to workers- A
PerformanceTimingobject containing latency-related performance information performance.memory- A non-standard extension added in Chrome, this property provides an object with basic memory usage information. You should not use this non-standard API.
-
Event handlers
Performance.onresourcetimingbufferfull- An
EventTargetwhich is a callback that will be called when theresourcetimingbufferfullevent is fired.
Methods
The Performance interface doesn't inherit any methods.
Performance.clearMarks()- Removes the given mark from the browser's performance entry buffer.
Performance.clearMeasures()- Removes the given measure from the browser's performance entry buffer.
Performance.clearResourceTimings()- Removes all
performance entrieswith aentryTypeof "resource" from the browser's performance data buffer. Performance.getEntries()- Returns a list of
PerformanceEntryobjects based on the given filter. Performance.getEntriesByName()- Returns a list of
PerformanceEntryobjects based on the given name and entry type. Performance.getEntriesByType()- Returns a list of
PerformanceEntryobjects of the given entry type. Performance.mark()- Creates a
timestampin the browser's performance entry buffer with the given name. Performance.measure()- Creates a named
timestampin the browser's performance entry buffer between two specified marks (known as the start mark and end mark, respectively). Performance.now()- Returns a
DOMHighResTimeStamprepresenting the amount of milliseconds elapsed since a reference instant. Performance.setResourceTimingBufferSize()- Sets the browser's resource timing buffer size to the specified number of "
resource"typeperformance entryobjects. Performance.toJSON()Not available to workers- Is a jsonizer returning a json object representing the
Performanceobject.
Specifications
Browser compatibility
Wir konvertieren die Kompatibilitätsdaten in ein maschinenlesbares JSON Format. Diese Kompatibilitätstabelle liegt noch im alten Format vor, denn die darin enthaltenen Daten wurden noch nicht konvertiert. Finde heraus wie du helfen kannst!
| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|---|
Basic support (timing attribute) |
6.0 [1] | (Ja) | 7.0 (7.0) | 9.0 | 15.0 | 8 |
navigation attribute |
9 | ? | 7 (7) | 9.0 | 15 | 8 |
now() on regular context |
20.0 -webkit 24.0 |
? | 15.0 (15.0) | 10.0 | (Ja) | 8 |
now() in Web workers. |
33.0 | ? | 34.0 (34.0) | ? | (Ja) | Nicht unterstützt |
toJSON() |
Nicht unterstützt | ? | 25.0 (25.0) | 9.0 | Nicht unterstützt | Nicht unterstützt |
getEntries(), getEntriesByType(), getEntriesByName() |
(Ja) | ? | (Ja) | (Ja) | (Ja) | 11 |
clearResourceTimings(), setResourceTimingBufferSize() |
(Ja) | ? | (Ja) | (Ja) | (Ja) | Nicht unterstützt |
onresourcetimingbufferfull |
(Ja) | ? | (Ja) | Nicht unterstützt | (Ja) | Nicht unterstützt |
mark(), clearMarks(), measure(), clearMeasure() |
43.0 | ? | 41 | 10 | 33 | Nicht unterstützt |
| Feature | Android | Android Webview | Edge | Firefox Mobile (Gecko) | Firefox OS | IE Phone | Opera Mobile | Safari Mobile | Chrome for Android |
|---|---|---|---|---|---|---|---|---|---|
| Basic support | (Ja) | (Ja) | (Ja) | 7.0 (7.0) | 1.0 (7.0) | 9.0 | 15.0 | 9 | (Ja) |
navigation attribute |
Nicht unterstützt | (Ja) | ? | Nicht unterstützt | Nicht unterstützt | 9.0 | (Ja) | 9 | (Ja) |
now() on regular context |
25.0 | ? | 15.0 (15.0) | 1.0 (15.0) | 10.0 | (Ja) | 9 | 20.0 webkit 25.0 |
|
now() in Web workers. |
Nicht unterstützt | (Ja) | ? | 34.0 (34.0) | ? | ? | ? | ? | (Ja) |
toJSON() |
Nicht unterstützt | Nicht unterstützt | ? | 25.0 (25.0) | 1.2 (25.0) | 10.0 | Nicht unterstützt | ? | Nicht unterstützt |
getEntries(), getEntriesByType(), getEntriesByName() |
4.4 | (Ja) | ? | 25.0 (25.0) | 1.2 (25.0) | 10.0 | 33 | 11 | 59 |
clearResourceTimings(), setResourceTimingBufferSize() |
Nicht unterstützt | (Ja) | ? | (Ja) | (Ja) | (Ja) | 33 | Nicht unterstützt | (Ja) |
onresourcetimingbufferfull |
Nicht unterstützt | (Ja) | ? | (Ja) | ? | Nicht unterstützt | 33 | Nicht unterstützt | (Ja) |
mark(), clearMarks(), measure(), clearMeasure() |
Nicht unterstützt | 46.0 | ? | 42 | 42 | 10 | 33 | Nicht unterstützt | 46.0 |
[1] Member prefixed with webkit have been removed or deprecated.