js计算代码运行时间

js计算代码运行时间。

利用 performance 计时

const START_TIME = performance.now();
// code
const END_TIME = performance.now();
const DURATION = END_TIME - START_TIME;
cosnole.log(DURATION);

利用 console.time 计时

console.time('timer_name');
// code
console.timeEnd('timer_name');

手写计时器

const START_TIME = new Date();
// code
const END_TIME = new Date();
const DURATION = END_TIME - START_TIME;
cosnole.log(DURATION);