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：（非标准）（生活水平）
console.time('someFunction')
someFunction() // Whatever is timed goes between the two "console.time"
console.timeEnd('someFunction')
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