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HTML

              
                <div id="wrapper">
  <button onClick="addContacts()" />연락처 추가</button>
  <button onClick="getContact()" />연락처 찾기</button>
  <div id="contacts">연락처가 여기에 추가됩니다!</div>
</div>
              
            
!

CSS

              
                body {
  margin: 0;
  padding: 0;
  width: 100%;
}
#wrapper {
  width: 40em;
  max-width: 100%;
  margin: 1em;
  padding: 1em;
}
#contacts {
  padding: 1em;
  border: 1px solid #ccc;
  font-family: 'Consolas', monospace;
}
              
            
!

JS

              
                var contacts = []

var searchContactsByName = function (name) {
  found = false
  contacts.forEach(function (e) {
    if (e.name == name) {
      found = e
    }
  })
  return found
}

var addContacts = function() {
  var name = prompt('이름을 입력하세요. \(\'취소\'를 누르면 입력을 그만합니다.\)')
  if (name) {
    if (searchContactsByName(name)) {
      alert(name + '님의 연락처는 이미 등록돼 있습니다. 다른 이름을 입력해 주세요.')
      addContacts()
    } else {
      var contact = prompt('연락처를 입력하세요. \(\'취소\'\)를 누르면 입력을 취소하고 다른 이름을 입력받습니다.')
      if (!contact) {
        addContacts()
      } else {
        contacts.push({ "name": name, "contact": contact })
        document.getElementById('contacts').innerText = JSON.stringify(contacts)
        var addMore = confirm(name + '님을 추가했습니다. 다른 연락처를 더 추가하시려면 \'확인\'을, 그만하려면 \'취소\'를 누르세요.')
        if (addMore) {
          addContacts()
        } else {
          document.getElementById('contacts').innerText = JSON.stringify(contacts)
          return false
        }
      }
    }
  }
}

var getContact = function () {
  search = prompt('이름을 입력하면 연락처를 알려드려요.')
  if (search) {
    found = searchContactsByName(search)
    if (!found) {
      alert(search + '님의 연락처를 찾지 못했습니다.')
    } else {
      alert(found.name + "님의 연락처는 " + found.contact + "입니다.")
    }
    return
  }
}
              
            
!
999px

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