Interface Performance

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.

MDN Reference

interface Performance {
    eventCounts: EventCounts;
    navigation: PerformanceNavigation;
    onresourcetimingbufferfull: ((this, ev) => any);
    timeOrigin: number;
    timing: PerformanceTiming;
    addEventListener<K>(type, listener, options?): void;
    addEventListener(type, listener, options?): void;
    clearMarks(markName?): void;
    clearMeasures(measureName?): void;
    clearResourceTimings(): void;
    dispatchEvent(event): boolean;
    getEntries(): PerformanceEntryList;
    getEntriesByName(name, type?): PerformanceEntryList;
    getEntriesByType(type): PerformanceEntryList;
    mark(markName, markOptions?): PerformanceMark;
    measure(measureName, startOrMeasureOptions?, endMark?): PerformanceMeasure;
    now(): number;
    removeEventListener<K>(type, listener, options?): void;
    removeEventListener(type, listener, options?): void;
    setResourceTimingBufferSize(maxSize): void;
    toJSON(): any;
}

Hierarchy

  • EventTarget
    • Performance

Properties

eventCounts navigation onresourcetimingbufferfull timeOrigin timing

Methods

addEventListener clearMarks clearMeasures clearResourceTimings dispatchEvent getEntries getEntriesByName getEntriesByType mark measure now removeEventListener setResourceTimingBufferSize toJSON

Properties

Readonly eventCounts

eventCounts: EventCounts

MDN Reference

Readonly navigation

navigation: PerformanceNavigation

Deprecated

MDN Reference

onresourcetimingbufferfull

onresourcetimingbufferfull: ((this, ev) => any)

MDN Reference

Type declaration

    • (this, ev): any

    • Parameters

      Returns any

Readonly timeOrigin

timeOrigin: number

MDN Reference

Readonly timing

timing: PerformanceTiming

Deprecated

MDN Reference

Methods

addEventListener

  • addEventListener<K>(type, listener, options?): void

  • Type Parameters

    • K extends "resourcetimingbufferfull"

    Parameters

    Returns void

  • addEventListener(type, listener, options?): void

  • Parameters

    Returns void

clearMarks

  • clearMarks(markName?): void

  • MDN Reference

    Parameters

    • Optional markName: string

    Returns void

clearMeasures

  • clearMeasures(measureName?): void

  • MDN Reference

    Parameters

    • Optional measureName: string

    Returns void

clearResourceTimings

  • clearResourceTimings(): void

  • MDN Reference

    Returns void

dispatchEvent

  • dispatchEvent(event): boolean

  • Dispatches a synthetic event event to target and returns true if either event's cancelable attribute value is false or its preventDefault() method was not invoked, and false otherwise.

    MDN Reference

    Parameters

    • event: Event

    Returns boolean

getEntries

getEntriesByName

getEntriesByType

mark

measure

now

  • now(): number

  • MDN Reference

    Returns number

removeEventListener

  • removeEventListener<K>(type, listener, options?): void

  • Type Parameters

    • K extends "resourcetimingbufferfull"

    Parameters

    Returns void

  • removeEventListener(type, listener, options?): void

  • Parameters

    Returns void

setResourceTimingBufferSize

  • setResourceTimingBufferSize(maxSize): void

  • MDN Reference

    Parameters

    • maxSize: number

    Returns void

toJSON

  • toJSON(): any

  • MDN Reference

    Returns any

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