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performance-js

v1.0.6

Published

performance, performance-javascript, performance-js

Downloads

9

Readme

测试程序执行时间

可测试一个或多个函数的执行次数、平均耗时、总耗时,并排序

使用 Babeljs 编译,或者拷贝函数,自己用

使用

yarn add --dev perfomance-js // or npm install --save-dev perfomance-js 
import p from 'performance-js'

参数

p(fns[,num])

  • 参数 fns:类型:函数 或 由函数组成的数组
  • 参数 num:执行次数,默认为 1

例子

  1. 一个函数例子

    p(f1, 100)
    function f1(){
        console.log('f1...')
    }

    效果图

  2. 多个函数例子

    p([f1, f2], 1000)
    function f1(){
        console.log('f1...')
    }
    
    function f2(){
        console.log('f2...')
    }

    效果图

函数源码

function p(fns = [], num = 1) {
  const _time = 'time',
    _start = 'start',
    _end = 'end',
    allMeasures = []

  if (!Array.isArray(fns)) {
    fns = Array.of(fns)
  }

  fns.forEach(v => {
    for (let i = 0; i < num; i++) {
      performance.mark(_start)
      v()
      performance.mark(_end)
      performance.measure(_time, _start, _end)
    }

    const measures = performance.getEntriesByName(_time)
    const sum = measures.reduce((prev, current) => current.duration + prev, 0)
    const average = sum / num
    const msg = {
      name: v.name,
      num,
      average,
      sum
    }

    performance.clearMarks()
    performance.clearMeasures()

    allMeasures.push(msg)
  })

  allMeasures.sort((a, b) => a.average - b.average)

  allMeasures.forEach((v, k) => {
    console.log(
      '%cTop:%d,函数:%s,执行次数:%d,平均耗时:%f ms,总耗时:%f ms',
      'color: green;',
      k + 1,
      v.name,
      v.num,
      v.average,
      v.sum
    )
  })
}