PerformanceObserverEntryList
The PerformanceObserverEntryList
interface is a list of performance events that were explicitly observed via the observe()
method.
Instance methods
PerformanceObserverEntryList.getEntries()
-
Returns a list of all explicitly observed
PerformanceEntry
objects. PerformanceObserverEntryList.getEntriesByType()
-
Returns a list of all explicitly observed
PerformanceEntry
objects of the given entry type. PerformanceObserverEntryList.getEntriesByName()
-
Returns a list of all explicitly observed
PerformanceEntry
objects based on the given name and entry type.
Example
Using PerformanceObserverEntryList
In the following example, list
is the PerformanceObserverEntryList
object. The getEntries()
method is called to get all explicitly observed PerformanceEntry
objects which are "measure" and "mark" in this case.
js
function perfObserver(list, observer) {
list.getEntries().forEach((entry) => {
if (entry.entryType === "mark") {
console.log(`${entry.name}'s startTime: ${entry.startTime}`);
}
if (entry.entryType === "measure") {
console.log(`${entry.name}'s duration: ${entry.duration}`);
}
});
}
const observer = new PerformanceObserver(perfObserver);
observer.observe({ entryTypes: ["measure", "mark"] });
Specifications
Specification |
---|
Performance Timeline # performanceobserverentrylist-interface |
Browser compatibility
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