# performance-js

> performance, performance-javascript, performance-js

Latest version **1.0.6** (published 2018-12-24) · MIT license · 0 weekly downloads

## Install

```sh
npm install performance-js
pnpm add performance-js
yarn add performance-js
bun add performance-js
```

## Health

**Score 15/100 (F)** — status: abandoned.

Positive: no vulnerabilities.

Warnings: low downloads; no types; no esm support.

Negative: abandoned; low maintenance score.

## Facts

| | |
|---|---|
| Version | 1.0.6 |
| Published | 2018-12-24 |
| First published | 2018-12-22 |
| Weekly downloads | 0 |
| License | MIT |
| TypeScript types | none |
| Module format | CommonJS |
| Dependencies | 0 |
| Unpacked size | 3.4 KB |
| Known vulnerabilities | 0 |
| Install scripts | no |
| GitHub stars | 1 |
| Author | liurongqing |
| Maintainers | liurongqing |
| Keywords | performance, performance-javascript, performance-js |

## Links

- npm: https://www.npmjs.com/package/performance-js
- Repository: https://github.com/liurongqing/performance-js
- Issues: https://github.com/liurongqing/performance-js/issues
- npm.io page: https://npm.io/package/performance-js

## Alternatives

- [mobx-react](https://npm.io/package/mobx-react.md) — 2.8M weekly downloads
- [rc-tree](https://npm.io/package/rc-tree.md) — 2.6M weekly downloads
- [@react-oauth/google](https://npm.io/package/@react-oauth/google.md) — 1.3M weekly downloads
- [@wagmi/connectors](https://npm.io/package/@wagmi/connectors.md) — 877.0K weekly downloads
- [vee-validate](https://npm.io/package/vee-validate.md) — 836.4K weekly downloads

## Recent versions

- 1.0.6 (latest) — 2018-12-24
- 1.0.5 — 2018-12-22
- 1.0.4 — 2018-12-22
- 1.0.3 — 2018-12-22
- 1.0.2 — 2018-12-22
- 1.0.1 — 2018-12-22
- 1.0.0 — 2018-12-22

## 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

```javascript
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

    ```javascript
    p(f1, 100)
    function f1(){
        console.log('f1...')
    }
    ```
    ![效果图](https://user-images.githubusercontent.com/26001948/50371161-2d313400-05f0-11e9-8443-dfff8240d017.jpg)

2. 多个函数例子

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

    function f2(){
        console.log('f2...')
    }
    ```
    ![效果图](https://user-images.githubusercontent.com/26001948/50371147-eba08900-05ef-11e9-9b62-fd5a3b52b1fa.jpg)



## 函数源码

```javascript
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
    )
  })
}
```

---
_Source: https://npm.io/package/performance-js · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._