Node.js PerformanceObserverEntryList.getEntriesByName(name[, type])用法及代碼示例

performanceObserverEntryList.getEntriesByName(name[, type])

參數

• name <string>
• type <string>
• 返回： <PerformanceEntry[]>

返回 PerformanceEntry 對象列表，按時間順序相對於 performanceEntry.startTime 其 performanceEntry.name 等於 name ，並且可選地，其 performanceEntry.entryType 等於 type 。

const {
  performance,
  PerformanceObserver
} = require('node:perf_hooks');

const obs = new PerformanceObserver((perfObserverList, observer) => {
  console.log(perfObserverList.getEntriesByName('meow'));
  /**
   * [
   *   PerformanceEntry {
   *     name: 'meow',
   *     entryType: 'mark',
   *     startTime: 98.545991,
   *     duration: 0
   *   }
   * ]
   */
  console.log(perfObserverList.getEntriesByName('nope')); // []

  console.log(perfObserverList.getEntriesByName('test', 'mark'));
  /**
   * [
   *   PerformanceEntry {
   *     name: 'test',
   *     entryType: 'mark',
   *     startTime: 63.518931,
   *     duration: 0
   *   }
   * ]
   */
  console.log(perfObserverList.getEntriesByName('test', 'measure')); // []

  performance.clearMarks();
  performance.clearMeasures();
  observer.disconnect();
});
obs.observe({ entryTypes: ['mark', 'measure'] });

performance.mark('test');
performance.mark('meow');