yyx990803/ping.js

## ping.js
const { URL } = require('url')
const https = require('https')

const pingCount = 5

const paths = {
  npm: `https://registry.npmjs.org/vue/latest`,
  yarn: `https://registry.yarnpkg.com/vue/latest`,
  tb: `https://registry.npm.taobao.org/vue/latest`
}

const ping = url => {
  return new Promise((resolve, reject) => {
    const start = Date.now()
    const { hostname, pathname } = new URL(url)
    const req = https.request({
      hostname,
      path: pathname
    }, () => {
      process.stdout.write('.')
      resolve(Date.now() - start)
    })
    req.on('error', reject)
    req.end()
  })
}

const pingX = (registry, times) => {
  return ping(paths[registry]).then(latency => {
    return times > 1
      ? pingX(registry, times - 1).then(results => [latency, ...results])
      : [latency]
  })
}

const pings = Object.keys(paths).map(registry => {
  return pingX(registry, pingCount).then(results => ({
    registry,
    results
  }))
})

Promise.all(pings)
  .then(results => {
    console.log()
    console.log(results)
  })
  .catch(err => {
    console.log(err)
  })
	const { URL } = require('url')
	const https = require('https')

	const pingCount = 5

	const paths = {
	npm: `https://registry.npmjs.org/vue/latest`,
	yarn: `https://registry.yarnpkg.com/vue/latest`,
	tb: `https://registry.npm.taobao.org/vue/latest`
	}

	const ping = url => {
	return new Promise((resolve, reject) => {
	const start = Date.now()
	const { hostname, pathname } = new URL(url)
	const req = https.request({
	hostname,
	path: pathname
	}, () => {
	process.stdout.write('.')
	resolve(Date.now() - start)
	})
	req.on('error', reject)
	req.end()
	})
	}

	const pingX = (registry, times) => {
	return ping(paths[registry]).then(latency => {
	return times > 1
	? pingX(registry, times - 1).then(results => [latency, ...results])
	: [latency]
	})
	}

	const pings = Object.keys(paths).map(registry => {
	return pingX(registry, pingCount).then(results => ({
	registry,
	results
	}))
	})

	Promise.all(pings)
	.then(results => {
	console.log()
	console.log(results)
	})
	.catch(err => {
	console.log(err)
	})