Add files via upload

ping.js

@@ -0,0 +1,52 @@
+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)
+  })