SOURCE

function getAccountArgs (uAccount) {
  let aArgs = uAccount.split('@')
  let aEx = ''
  let aSuffix = ''
  if (aArgs.length >= 2 && aArgs[1] !== '') {
    aArgs.map((item, index) => {
      if (index < (aArgs.length - 1)) {
        aEx = aEx + item + '@'
      } else {
        return false
      }
    })
    aSuffix = aArgs[aArgs.length - 1]
  } else {
    aEx = aArgs[0]
  }
  let AccountArgs = []
  AccountArgs[0] = aEx
  AccountArgs[1] = aSuffix
  return AccountArgs
}

// 账号转邮箱
function emailTransition (uAccount) {
  let email = ''
  let emailRules = [
    {
      accountSuffix: 'hq.cmcc',
      emailSuffix: 'chinamobile.com'
    },
    {
      accountSuffix: 'di.cmcc',
      emailSuffix: 'cmdi.chinamobile.com'
    },
    {
      accountSuffix: 'mg.cmcc',
      emailSuffix: 'migu.chinamobile.com'
    },
    {
      accountSuffix: 'ECO_COMPANY.cmcc',
      emailSuffix: 'aspirecn.com'
    }
  ]
  // 其他 之后的.cmcc替换为.chinamobile.com
  let uAccountArgs = getAccountArgs(uAccount)
  console.log('1', uAccountArgs)
  let uAccountEx = uAccountArgs[0]
  let uAccountSuffix = uAccountArgs[1]
  let flag = false
  emailRules.map(rule => {
    if (uAccountSuffix === rule.accountSuffix) {
      email = uAccountEx + rule.emailSuffix
      console.log('2', email)
      flag = true
      return true
    }
  })
  console.log('3', flag, uAccountEx)
  if (!flag && uAccountEx !== '') {
    email = uAccountSuffix === '' ? uAccountEx + '@chinamobile.com' : uAccountEx + uAccountSuffix.replace('cmcc', 'chinamobile.com')
  }
  return email
}

let u = 'yaojinbao@bj.cmcc'
console.log(emailTransition(u))