parsr a url string to a obj

parseUrl.js

function parseUrl (url) {
  const l = document.createElement('a')
  l.href = url
  const protocol = l.protocol + '//'
  const host = l.hostname
  const path = decodeURIComponent(l.pathname)
  const reg = /\/(v\d\.\d+)(.*)/g
  const match = reg.exec(path)
  const ver = match && match[1] || ''
  const api = ver ? path.replace('/' + ver, '') : path

  return {
    protocol,
    host,
    ver,
    api
  }
}