PerformanceObserver.takeRecords()

The takeRecords() method of the PerformanceObserver interface returns the current list of performance entries stored in the performance observer, emptying it out.

Syntax

takeRecords()

Parameters

None.

Return value

A list of PerformanceEntry objects.

Examples

Taking records

The following example stores the current list of performance entries into records and empties the performance observer.

const observer = new PerformanceObserver((list, obj) => {
  list.getEntries()
    .forEach((entry) => {
      // Process "mark" and "measure" events
    });
});
observer.observe({ entryTypes: ["mark", "measure"] });
const records = observer.takeRecords();
console.log(records[0].name);
console.log(records[0].startTime);
console.log(records[0].duration);

Specifications

Specification
Performance Timeline
# dom-performanceobserver-takerecords

Browser compatibility

BCD tables only load in the browser