performance.getEntriesByName()

getEntriesByName()方法返回一个给定名称和name和type属性的PerformanceEntry对象数组。在创建performance标记或在明确的时间点测量(比如手动调用mark()方法)也可以创建这样的对象数组。

在Workers中可以使用该方法。

语法

entries = window.performance.getEntriesByName(name, type);

参数

name
The name of the entry to retrieve.
type 可选
The type of entry to retrieve such as "mark". The valid entry types are listed in PerformanceEntry.entryType.

Return value

entries
A list of PerformanceEntry objects that have the specified name and type. If the type argument is not specified, only the name will be used to determine the entries to return. The items will be in chronological order based on the entries' startTime (en-US). If no objects meet the specified criteria, an empty list is returned.

Example

function use_PerformanceEntry_methods() {
  log("PerformanceEntry tests ...");

  if (performance.mark === undefined) {
    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
  var p = performance.getEntries();
  for (var i=0; i < p.length; i++) {
    log("Entry[" + i + "]");
    check_PerformanceEntry(p[i]);
  }

  // Use getEntries(name, entryType) to get specific entries
  p = performance.getEntries({name : "Begin", entryType: "mark"});
  for (var i=0; i < p.length; i++) {
    log("Begin[" + i + "]");
    check_PerformanceEntry(p[i]);
  }

  // Use getEntriesByType() to get all "mark" entries
  p = performance.getEntriesByType("mark");
  for (var i=0; i < p.length; i++) {
    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 (var i=0; i < p.length; i++) {
    log ("Mark and Begin entry[" + i + "]: name = " + p[i].name +
         "; startTime = " + p[i].startTime +
         "; duration  = " + p[i].duration);
  }
}

Specifications

Specification Status Comment
Performance Timeline Level 2
getEntriesByName()
Candidate Recommendation
Performance Timeline
getEntriesByName()
Recommendation Initial definition.

Browser compatibility

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