performance.timerify(fn[, options])

• fn <Function>

• options <Object>

  • histogram <RecordableHistogram> 使用 perf_hooks.createHistogram() 创建的直方图对象，以纳秒为单位记录运行时间。

    ¥histogram <RecordableHistogram> A histogram object created using perf_hooks.createHistogram() that will record runtime durations in nanoseconds.

此属性是 Node.js 的扩展。它在 Web 浏览器中不可用。

¥This property is an extension by Node.js. It is not available in Web browsers.

将函数封装在测量被封装函数运行时间的新函数中。PerformanceObserver 必须订阅 'function' 事件类型才能访问时间细节。

¥Wraps a function within a new function that measures the running time of the wrapped function. A PerformanceObserver must be subscribed to the 'function' event type in order for the timing details to be accessed.

import { performance, PerformanceObserver } from 'node:perf_hooks';

function someFunction() {
  console.log('hello world');
}

const wrapped = performance.timerify(someFunction);

const obs = new PerformanceObserver((list) => {
  console.log(list.getEntries()[0].duration);

  performance.clearMarks();
  performance.clearMeasures();
  obs.disconnect();
});
obs.observe({ entryTypes: ['function'] });

// A performance timeline entry will be created
wrapped();const {
  performance,
  PerformanceObserver,
} = require('node:perf_hooks');

function someFunction() {
  console.log('hello world');
}

const wrapped = performance.timerify(someFunction);

const obs = new PerformanceObserver((list) => {
  console.log(list.getEntries()[0].duration);

  performance.clearMarks();
  performance.clearMeasures();
  obs.disconnect();
});
obs.observe({ entryTypes: ['function'] });

// A performance timeline entry will be created
wrapped();拷贝

如果封装的函数返回 promise，则 finally 句柄将绑定到该 promise 上，并且一旦调用 finally 句柄就会报告持续时间。

¥If the wrapped function returns a promise, a finally handler will be attached to the promise and the duration will be reported once the finally handler is invoked.