performance.getEntries() - Web APIs 编辑

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:

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

Browser compatibility

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