public isAuthenticated(): boolean {
  if (localStorage.getItem('token')){
    return true;
  }
  else {
    return false;
  }
}

public isAdmin(): boolean {
  if (!this.isAuthenticated()) {
    return false;
  }
  var userInfo: UserInfo = JSON.parse(localStorage.getItem('userInfo'));
  if (userInfo == null) {
    return false;
  }
  let userRole = userInfo.UserRole;
  if (userRole == 1) {
    return true;
  }
  return false;
}