From 074785cea106179cb3305637055ab0a009ca74f2 Mon Sep 17 00:00:00 2001 From: Peter Bengtsson Date: Tue, 8 Dec 2020 14:42:52 -0500 Subject: initial commit --- files/pt-br/web/api/performance/index.html | 138 +++++++++++++++++++ files/pt-br/web/api/performance/now/index.html | 160 ++++++++++++++++++++++ files/pt-br/web/api/performance/tojson/index.html | 61 +++++++++ 3 files changed, 359 insertions(+) create mode 100644 files/pt-br/web/api/performance/index.html create mode 100644 files/pt-br/web/api/performance/now/index.html create mode 100644 files/pt-br/web/api/performance/tojson/index.html (limited to 'files/pt-br/web/api/performance') diff --git a/files/pt-br/web/api/performance/index.html b/files/pt-br/web/api/performance/index.html new file mode 100644 index 0000000000..28e3a63c06 --- /dev/null +++ b/files/pt-br/web/api/performance/index.html @@ -0,0 +1,138 @@ +--- +title: Performance +slug: Web/API/Performance +tags: + - API + - Interface + - Navigation Timing + - NeedsTranslation + - Performance + - Reference + - TopicStub + - Web Performance +translation_of: Web/API/Performance +--- +
{{APIRef("High Resolution Time")}}
+ +

The Performance interface represents timing-related performance information for the given page.

+ +

An object of this type can be obtained by calling the {{domxref("Window.performance")}} read-only attribute.

+ +
+

Note: This interface and its members are available in Web Workers, except where indicated below. Note that some available parts of the interface are not yet documented (see the Performance Timeline and User Timing specs for more details.) 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.

+ +
+
{{domxref("Performance.navigation")}} {{readonlyInline}}
+
Is a {{domxref("PerformanceNavigation")}} object representing the type of navigation that occurs in the given browsing context, like the amount of redirections needed to fetch the resource. Not available in workers.
+
{{domxref("Performance.onframetimingbufferfull")}}
+
TBD
+
{{domxref("Performance.onresourcetimingbufferfull")}}
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Is an {{domxref("EventTarget")}} which is a callback that will be called when the {{event("resourcetimingbufferfull")}} event is fired.
+
{{domxref("Performance.timing")}} {{readonlyInline}}
+
Is a {{domxref("PerformanceTiming")}} object containing latency-related performance information. Not available in workers.
+
+ +

Methods

+ +

The Performance interface doesn't inherit any method.

+ +
+
{{domxref("Performance.clearFrameTimings()")}}
+
TBD
+
{{domxref("Performance.clearMarks()")}}
+
Removes the given mark from the browser's performance entry buffer.
+
{{domxref("Performance.clearMeasures()")}}
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Removes the given measure from the browser's performance entry buffer.
+
{{domxref("Performance.clearResourceTimings()")}}
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Removes all {{domxref("PerformanceEntry","performance entries")}} with a {{domxref("PerformanceEntry.entryType","entryType")}} of "resource" from the browser's performance data buffer.
+
{{domxref("Performance.getEntries()")}}
+
Returns a list of {{domxref("PerformanceEntry")}} objects based on the given filter.
+
{{domxref("Performance.getEntriesByName()")}}
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Returns a list of {{domxref("PerformanceEntry")}} objects based on the given name and entry type.
+
{{domxref("Performance.getEntriesByType()")}}
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Returns a list of {{domxref("PerformanceEntry")}} objects of the given entry type.
+
{{domxref("Performance.mark()")}}
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Creates a {{domxref("DOMHighResTimeStamp","timestamp")}} in the browser's performance entry buffer with the given name.
+
{{domxref("Performance.measure()")}}
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Creates a named {{domxref("DOMHighResTimeStamp","timestamp")}} in the browser's performance entry buffer between two specified marks (known as the start mark and end mark, respectively).
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{{domxref("Performance.now()")}}
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Returns a {{domxref("DOMHighResTimeStamp")}} representing the amount of milliseconds elapsed since a reference instant.
+
{{domxref("Performance.setFrameTimingBufferSize()")}}
+
TBD
+
{{domxref("Performance.setResourceTimingBufferSize()")}}
+
Sets the browser's resource timing buffer size to the specified number of "resource" {{domxref("PerformanceEntry.entryType","type")}} {{domxref("PerformanceEntry","performance entry")}} objects.
+
{{domxref("Performance.toJSON()")}}
+
Is a jsonizer returning a json object representing the Performance object.
+
+ +

Specifications

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SpecificationStatusComment
{{SpecName('Highres Time Level 2', '#the-performance-interface', 'toJSON()')}}{{Spec2('Highres Time Level 2')}}Defines toJson() method.
{{SpecName('Highres Time', '#the-performance-interface', 'Performance')}}{{Spec2('Highres Time')}}Defines now() method.
{{SpecName('Navigation Timing', '#sec-window.performance-attribute', 'Performance')}}{{Spec2('Navigation Timing')}}Defines timing and navigation properties.
{{SpecName('Performance Timeline Level 2', '#extensions-to-the-performance-interface', 'Performance extensions')}}{{Spec2('Performance Timeline Level 2')}}Changes getEntries() interface.
{{SpecName('Performance Timeline', '#sec-window.performance-attribute', 'Performance extensions')}}{{Spec2('Performance Timeline')}}Defines getEntries(), getEntriesByType() and getEntriesByName() methods.
{{SpecName('Resource Timing', '#extensions-performance-interface', 'Performance extensions')}}{{Spec2('Resource Timing')}}Defines clearResourceTimings() and setResourceTimingBufferSize() methods and the onresourcetimingbufferfull property.
{{SpecName('User Timing Level 2', '#extensions-performance-interface', 'Performance extensions')}}{{Spec2('User Timing Level 2')}}Clarifies mark(), clearMark(), measure() and clearMeasure() methods.
{{SpecName('User Timing', '#extensions-performance-interface', 'Performance extensions')}}{{Spec2('User Timing')}}Defines mark(), clearMark(), measure() and clearMeasure() methods.
{{SpecName('Frame Timing', '#extensions-performance-interface','Performance extensions')}}{{Spec2('User Timing')}}Defines clearFrameTimings(), setFrameTimingBufferSize(), and onframetimingbufferfull methods.
+ +

Browser compatibility

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+
+ + +

{{Compat("api.Performance")}}

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diff --git a/files/pt-br/web/api/performance/now/index.html b/files/pt-br/web/api/performance/now/index.html new file mode 100644 index 0000000000..b6539ebebe --- /dev/null +++ b/files/pt-br/web/api/performance/now/index.html @@ -0,0 +1,160 @@ +--- +title: performance.now() +slug: Web/API/Performance/now +translation_of: Web/API/Performance/now +--- +
{{APIRef("High Resolution Timing")}}
+ +

O método performance.now() retorna {{domxref("DOMHighResTimeStamp")}}, medido em milisegundos, com precisão de cinco milésimos de milissegundo (5 microsegundos).

+ +

O valor retornado representa o tempo decorrido desde o time origin (the {{domxref("PerformanceTiming.navigationStart")}} property). Em um web worker, o tempo inicial é o momento em que o contexto da execução(e.g. thread ou processo) é criado. Em uma janela, é o tempo em que o usuário iniciou a navegação neste documento. Tenha em mente que:

+ + + +

Sintaxe

+ +
t = performance.now();
+ +

Exemplo

+ +
var t0 = performance.now();
+doSomething();
+var t1 = performance.now();
+console.log("Call to doSomething took " + (t1 - t0) + " milliseconds.");
+
+ +

Unlike other timing data available to JavaScript (for example Date.now), the timestamps returned by Performance.now() are not limited to one-millisecond resolution. Instead, they represent times as floating-point numbers with up to microsecond precision.

+ +

Also unlike Date.now(), the values returned by Performance.now() always increase at a constant rate, independent of the system clock (which might be adjusted manually or skewed by software like NTP). Otherwise, performance.timing.navigationStart + performance.now() will be approximately equal to Date.now().

+ +

Especificações

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SpecificationStatusComment
{{SpecName('Highres Time Level 2', '#dom-performance-now', 'performance.now()')}}{{Spec2('Highres Time Level 2')}}Stricter definitions of interfaces and types.
{{SpecName('Highres Time', '#dom-performance-now', 'performance.now()')}}{{Spec2('Highres Time')}}Initial definition
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Compatibilidade de Navegadores

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{{CompatibilityTable}}

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FeatureChromeEdgeFirefox (Gecko)Internet ExplorerOperaSafari
Basic support{{CompatChrome("20.0")}} {{property_prefix("webkit")}}
+ {{CompatChrome("24.0")}} [1]		{{CompatVersionUnknown}}{{CompatGeckoDesktop("15.0")}}10.0{{CompatOpera("15.0")}}{{CompatSafari("8.0")}}
on Web workers{{CompatChrome("33")}}{{CompatUnknown}}{{CompatGeckoDesktop("34.0")}}{{CompatUnknown}}{{CompatUnknown}}{{CompatUnknown}}
now() in a dedicated worker is now separate from the main context's now().{{CompatUnknown}}{{CompatUnknown}}{{CompatGeckoDesktop("45.0")}}{{CompatUnknown}}{{CompatUnknown}}{{CompatUnknown}}
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FeatureAndroidAndroid WebviewEdgeFirefox Mobile (Gecko)IE MobileOpera MobileSafari MobileChrome for Android
Basic support{{CompatAndroid("4.0")}}{{CompatChrome("25.0")}}{{CompatVersionUnknown}}{{CompatGeckoMobile("15.0")}}10.0{{CompatNo}}9{{CompatChrome("25.0")}}
on Web workers{{CompatUnknown}}{{CompatVersionUnknown}}{{CompatUnknown}}{{CompatGeckoMobile("34.0")}}{{CompatUnknown}}{{CompatUnknown}}{{CompatUnknown}}{{CompatVersionUnknown}}
now() in a dedicated worker is now separate from the main context's now().{{CompatUnknown}}{{CompatUnknown}}{{CompatUnknown}}{{CompatGeckoMobile("45.0")}}{{CompatUnknown}}{{CompatUnknown}}{{CompatUnknown}}{{CompatUnknown}}
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+ +

[1] Windows versions of Chrome 20 through 33 return performance.now() only to millisecond precision.

+ +

Veja também

+ + diff --git a/files/pt-br/web/api/performance/tojson/index.html b/files/pt-br/web/api/performance/tojson/index.html new file mode 100644 index 0000000000..2dac99f0f5 --- /dev/null +++ b/files/pt-br/web/api/performance/tojson/index.html @@ -0,0 +1,61 @@ +--- +title: Performance.toJSON() +slug: Web/API/Performance/toJSON +translation_of: Web/API/Performance/toJSON +--- +
{{APIRef("High Resolution Timing")}}
+ +

O método toJSON() da interface {{domxref("Performance")}} é um serializador padrão: Ele retorna uma representação em JSON das propriedades do objeto performance.

+ +

Sintaxe

+ +
minhaPerf = performance.toJSON()
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Argumentos

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+
Nenhum
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Valor de retorno

+ +
+
minhaPerf
+
Um objeto JSON que é a serialização do objeto {{domxref("Performance")}}.
+
+ +

Exemplo

+ +
var js;
+js = window.performance.toJSON();
+console.log("json = " + JSON.stringify(js));
+
+ +

Especificações

+ + + + + + + + + + + + + + +
SpecificationStatusComment
{{SpecName('Highres Time Level 2', '#the-performance-interface', 'toJSON() serializer')}}{{Spec2('Highres Time Level 2')}}Define toJson().
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Compatibilidade de navegadores

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{{Compat("api.Performance.toJSON")}}

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