performance.getEntries()
The getEntries()
method returns a list of all
PerformanceEntry
objects for the page. The list's members
(entries) can be created by making performance marks or
measures (for example by calling the mark()
method) at explicit points in time. If you are only interested in performance entries of
certain types or that have certain names, see getEntriesByType()
and getEntriesByName()
.
Note: This feature is available in Web Workers
Syntax
General syntax:
entries = window.performance.getEntries();
Return value
- entries
-
An array of
PerformanceEntry
objects. The items will be in chronological order based on the entries'startTime
.
Example
function use_PerformanceEntry_methods() {
console.log("PerformanceEntry tests ...");
if (performance.mark === undefined) {
console.log("... performance.mark Not supported");
return;
}
// Create some performance entries via the mark() method
performance.mark("Begin");
do_work(50000);
performance.mark("End");
performance.mark("Begin");
do_work(100000);
performance.mark("End");
do_work(200000);
performance.mark("End");
// Use getEntries() to iterate through the each entry
let p = performance.getEntries();
for (var i=0; i < p.length; i++) {
console.log("Entry[" + i + "]");
check_PerformanceEntry(p[i]);
}
// Use getEntriesByType() to get all "mark" entries
p = performance.getEntriesByType("mark");
for (let i=0; i < p.length; i++) {
console.log ("Mark only entry[" + i + "]: name = " + p[i].name +
"; startTime = " + p[i].startTime +
"; duration = " + p[i].duration);
}
// Use getEntriesByName() to get all "mark" entries named "Begin"
p = performance.getEntriesByName("Begin", "mark");
for (let i=0; i < p.length; i++) {
console.log ("Mark and Begin entry[" + i + "]: name = " + p[i].name +
"; startTime = " + p[i].startTime +
"; duration = " + p[i].duration);
}
}
Specifications
Specification |
---|
Performance Timeline # dom-performance-getentries |
Browser compatibility
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