js performance.now vs console.time and console.timeEnd All In One

js performance.now vs console.time and console.timeEnd All In One

js 高精度时间戳

性能优化

性能测试

// const arr = (new Uint8Array(100000)).map((item, i) => i +  1);
const arr = (new Uint32Array(100000)).map((item, i) => i +  1);

// arr.length;
// 100000
// arr;

function testPerformance(arr, i) {
  let startTime = performance.now();
  console.log(`arr[i], i =`, arr[i], i);
  let endTime = performance.now();
  console.log(`performance time is \`${endTime - startTime}\` ms`);
}

function testTime(arr, i) {
  console.time('array test');
  console.log(`arr[i], i =`, arr[i], i);
  console.timeEnd('array test');
  // console.log(`performance time is \`${endTime - startTime}\` ms`);
}


setTimeout(() => {
  testPerformance(arr, 0);
  testPerformance(arr, 99999);

  console.log('\n');

  testTime(arr, 0);
  testTime(arr, 99999);
}, 0);


// testPerformance(arr, 0);
// testPerformance(arr, 99999);

// console.log('\n');

// testTime(arr, 0);
// testTime(arr, 99999);

refs

https://developer.mozilla.org/en-US/docs/Web/API/Performance/now

https://developer.mozilla.org/en-US/docs/Web/API/console/time

https://developer.mozilla.org/en-US/docs/Web/API/console/timeEnd

https://nodejs.org/api/perf_hooks.html#perf_hooks_class_performance

https://nodejs.org/api/console.html#console_console_timeend_label

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