Performance.getEntries()

getEntries() 对于给定的filter,此方法返回 PerformanceEntry 对象数组. 数组成员(入口)可以在显式的时间点用 performance marks或measures 来创建(例如调用mark() 方法) .

此方法暴露给Window 和 Worker接口.

语法

取全部:

entries = window.performance.getEntries();
entries = window.performance.getEntries(PerformanceEntryFilterOptions);

取特定:

entries = performance.getEntries({name: "entry_name", entryType: "mark"});

参数

PerformanceEntryFilterOptions 可选
PerformanceEntryFilterOptions 是一个带有以下键值的字典:

返回值

entries
一个由符合filter条件的PerformanceEntry 对象构成的数组 . 数组成员按PerformanceEntry.startTime时间顺序排列 . 如果没有符合filter条件的对象,那么返回空数组. 如果不带任何参数,返回全部entries.

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);
  }
}

//entryType,name,initiatorType  Examples
var p = performance.getEntries();

var ptyps = p.map((ele) => {return(ele.entryType)});
//Array(94) [ "navigation", "resource", "resource", "resource", "resource", "resource", "resource", "resource", "resource", "resource", … ]

var pnms = p.map((ele) => {return(ele.name)});
//Array(94) [ "document", "https://csdnimg.cn/public/static/css/avatar.css", "https://csdnimg.cn/public/common/libs/jquery/jquery-1.9.1.min.js", "https://csdnimg.cn/rabbit/exposure-click/main-1.0.5.js", "https://csdnimg.cn/release/phoenix/production/main-e96db8abdf.js", "https://csdnimg.cn/pubfooter/js/tracking-1.0.2.js", "https://csdnimg.cn/public/common/toolbar/js/content_toolbar.js", "https://csdnimg.cn/release/phoenix/production/markdown_views-ea0013b516.css", "https://csdnimg.cn/search/baidu_search-1.1.2.js?v=201802071056&autorun=true&install=true&keyword=%E5%B0%8F%E7%A8%8B%E5%BA%8F%E6%89%A7%E8%A1%8C%E9%A1%BA%E5%BA%8F", "https://csdnimg.cn/release/phoenix/production/main-f869aa95a4.css", … ]

var pityps = p.map((ele) => {return(ele.initiatorType)});
//Array(94) [ "navigation", "link", "script", "script", "script", "script", "script", "link", "script", "link", … ]

Specifications
Specification Status Comment
Performance Timeline Level 2
getEntries()
Candidate Recommendation getEntries() method has an optional argument.
Performance Timeline
getEntries()
Recommendation Initial definition.

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