Get User info using JS SDK after login with Facebook

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To day iam working with facebook js sdk it is very easy to get user details after user login to facebook.

<script src="http://connect.facebook.net/en_US/all.js"></script>
  <script type="text/javascript">
  FB.init({
      appId  : 'your AppId',
      status : true,
      cookie : true,
      xfbml  : true
  });
                FB.login(function (response) {
   getFBuserData ();
      });
  function getFBuserData () {
                   FB.api('/me', function(data){
                  var userdetails = data.first_name+ data.last_name + data.id+data.gender+data.link+data.birthday+data.email;
                    alert(userdetails);
          
                })
         }
</script>