使用 performance.now()

var startTime = performance.now()

doSomething()   // <---- measured code goes between startTime and endTime

var endTime = performance.now()

console.log(`Call to doSomething took ${endTime - startTime} milliseconds`)

在Node.js它需要导入performance类

进口业绩

const { performance } = require('perf_hooks');

Using console.time living standard

console.time('doSomething')

doSomething()   // <---- The function you're measuring time for 

console.timeEnd('doSomething')

注意：
传递给time()andtimeEnd()方法的字符串必须匹配
（定时器才能按预期完成）。

console.time()文件：

• MDN 文档
• Node.js 文档