如何测量函数执行所需的时间

使用

performance.now（）

var t0 = performance.now()doSomething()   // <---- The function you're measuring time for var t1 = performance.now()console.log("Call to doSomething took " + (t1 - t0) + " milliseconds.")

NodeJs：需要导入performance类

使用

console.time

console.time('someFunction')someFunction() // Whatever is timed goes between the two "console.time"console.timeEnd('someFunction')