Performance

Performanceインターフェースは、現在のページの実績に基づく情報へのアクセスを提供します。High Resolution Time APIの一部ですが、Performance Timeline API、Navigation Timing API、User Timing APIそしてResource Timing APIによって拡張されています。

このタイプのオブジェクトは、読み取り専用の属性Window.performanceを呼び出すことによって取得することができます。

Properties

The Performance interface doesn't inherit any properties.

Performance.navigation 読取専用 読取専用

Is a PerformanceNavigation object representing the type of navigation that occurs in the given browsing context, like the amount of redirections needed to fetch the resource.

Performance.onresourcetimingbufferfull

Is an EventTarget which is a callback that will be called when the resourcetimingbufferfull event is fired.

Performance.timing 読取専用 読取専用

Is a PerformanceTiming object containing latency-related performance information.

Methods

The Performance interface doesn't inherit any method.

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 entries with a entryType of "resource" from the browser's performance data buffer.

Performance.getEntries()

Returns a list of PerformanceEntry objects based on the given filter.

Performance.getEntriesByName()

Returns a list of PerformanceEntry objects based on the given name and entry type.

Performance.getEntriesByType()

Returns a list of PerformanceEntry objects of the given entry type.

Performance.mark()

Creates a timestamp in the browser's performance entry buffer with the given name.

Performance.measure()

Creates a named timestamp in the browser's performance entry buffer between two specified marks (known as the start mark and end mark, respectively).

Performance.now()

Returns a DOMHighResTimeStamp representing 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" type performance entry objects.

Performance.toJSON() 読取専用

Is a jsonizer returning a json object representing the Performance object.

Specifications

Browser compatibility