JavaScript如何测量函数执行所花费的时间

使用 performance.now（）：

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

NodeJs

performance

使用 console.time： （非标准）(living standard)

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

注意 ：
传递给

time()

timeEnd()