PerformanceEntry

Baseline Widely available

This feature is well established and works across many devices and browser versions. Itâs been available across browsers since 2017ë 9ì.

PerformanceEntry ê°ì²´ë performance timeline ìì ë¨ì¼ ì±ë¥ ìì¹ë¥¼ ìº¡ìí í©ëë¤. performance entryë ìì©íë¡ê·¸ë¨ì í¹ì ì§ì ìì performance *mark*ë *measure*ë¥¼ ìì±í¨ì¼ë¡ì¨ (ìë¥¼ ë¤ë©´ mark()ë¥¼ í¸ì¶íë ë°©ë²ì¼ë¡) ì§ì ì ì¼ë¡ ë§ë¤ì´ì§ ì ììµëë¤. ëë (ì´ë¯¸ì§ì ê°ì) ë¦¬ìì¤ë¥¼ ë¡ë©íë ë±ì ê°ì ì ì¸ ë°©ë²ì¼ë¡ ìì±ëê¸°ë í©ëë¤.

PerformanceEntry ì¸ì¤í´ì¤ë íì ë¤ì ìë¸íìë¤ ì¤ íëë¥¼ ë°ë¦ëë¤:

ì°¸ê³ : ì´ ê¸°ë¥ì Web Workerìì ì¬ì©í ì ììµëë¤.

Properties

PerformanceEntry.name ì½ê¸° ì ì©: A value that further specifies the value returned by the PerformanceEntry.entryType property. The value of both depends on the subtype. See property page for valid values.
PerformanceEntry.entryType ì½ê¸° ì ì©: A DOMString representing the type of performance metric such as, for example, "mark". See property page for valid values.
PerformanceEntry.startTime ì½ê¸° ì ì©: A DOMHighResTimeStamp representing the starting time for the performance metric.
PerformanceEntry.duration ì½ê¸° ì ì©: A DOMHighResTimeStamp representing the time value of the duration of the performance event.

Methods

PerformanceEntry.toJSON(): Returns a JSON representation of the PerformanceEntry object.

Example

The following example checks all PerformanceEntry properties to see if the browser supports them and if so, write their values to the console.

function print_PerformanceEntries() {
  // Use getEntries() to get a list of all performance entries
  var p = performance.getEntries();
  for (var i = 0; i < p.length; i++) {
    console.log("PerformanceEntry[" + i + "]");
    print_PerformanceEntry(p[i]);
  }
}
function print_PerformanceEntry(perfEntry) {
  var properties = ["name", "entryType", "startTime", "duration"];

  for (var i = 0; i < properties.length; i++) {
    // Check each property
    var supported = properties[i] in perfEntry;
    if (supported) {
      var value = perfEntry[properties[i]];
      console.log("... " + properties[i] + " = " + value);
    } else {
      console.log("... " + properties[i] + " is NOT supported");
    }
  }
}