Window.performance
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since сентябрь 2015 г..
The Web Performance API allows web pages access to certain functions for measuring the performance of web pages and web applications, including the Navigation Timing API and high-resolution time data.
Methods
performance.mark()-
Maps a
DOMHighResTimeStampto a specified name representing the amount of milliseconds elapsed since a reference instant. performance.now()-
Возвращает
DOMHighResTimeStampпредставляющий количество миллисекунд прошедшее с момента отсчёта. measure()-
This method stores the
DOMHighResTimeStampduration between two marks along with the associated name (a "measure"). getEntriesByType()-
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getEntriesByType()-
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getEntriesByName()-
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clearMarks()-
If the markName argument is not specified, this method removes all marks and their associated DOMHighResTimeStamp time values.
If the markName argument is specified, this method removes all DOMHighResTimeStamp time values for the given mark name.
If the markName argument is specified but the specified markName does not exist, this method will do nothing.
Properties
performance.timing-
Is a
PerformanceTimingobject containing latency-related performance information. -
Is a
PerformanceNavigationobject representing the type of navigation that occurs in the given browsing context, like the amount of redirections needed to fetch the resource. - performance.memory
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A non-standard extension added in Chrome.