前後端測時間效率

performance.js

const { performance } = require('perf_hooks');
// 前端為 `window.performance`
// 後端為 `const { performance } = require('perf_hooks');`

const func = (n) => {
    return ((1 + n) * n) / 2;
};

const start = performance.now();
func(1000000);
const end = performance.now();
console.log("milliseconds:", end - start);