Example Login flow for Facebook JS SDK 2.5

<div id="fb-root"></div>
<script>
  // This is called with the results from from FB.getLoginStatus().
  function statusChangeCallback(response) {
    console.log('statusChangeCallback');
    console.log(response);
    // The response object is returned with a status field that lets the
    // app know the current login status of the person.
    // Full docs on the response object can be found in the documentation
    // for FB.getLoginStatus().
    if (response.status === 'connected') {
      // Logged into your app and Facebook.

      testAPI();
      document.getElementById('status').innerHTML += '<button onclick="userlogout();checkLoginState();">Logout</button>';
    } else if (response.status === 'not_authorized') {
      // The person is logged into Facebook, but not your app.
      document.getElementById('status').innerHTML = '<button onclick="userlogin();checkLoginState();">Login</button>';
    } else {
      // The person is not logged into Facebook, so we're not sure if
      // they are logged into this app or not.
      document.getElementById('status').innerHTML = '<button onclick="userlogin();checkLoginState();">Login</button>';
    }
  }

  // This function is called when someone finishes with the Login
  // Button.  See the onlogin handler attached to it in the sample
  // code below.
  function checkLoginState() {
    FB.getLoginStatus(function(response) {
      statusChangeCallback(response);
    });
  }

  window.fbAsyncInit = function() {
  FB.init({
    appId      : '{your-app-id}',
    cookie     : true,  // enable cookies to allow the server to access
                        // the session
    xfbml      : true,  // parse social plugins on this page
    version    : 'v2.5' // use graph api version 2.5
  });
  //
  // These three cases are handled in the callback function.

  FB.getLoginStatus(function(response) {
    statusChangeCallback(response);
  });

  };

  // Load the SDK asynchronously
  (function(d, s, id) {
    var js, fjs = d.getElementsByTagName(s)[0];
    if (d.getElementById(id)) return;
    js = d.createElement(s); js.id = id;
    js.src = "//connect.facebook.net/en_US/sdk.js";
    fjs.parentNode.insertBefore(js, fjs);
  }(document, 'script', 'facebook-jssdk'));

  // Here we run a very simple test of the Graph API after login is
  // successful.  See statusChangeCallback() for when this call is made.
  function testAPI() {
    console.log('Welcome!  Fetching your information.... ');
    FB.api('/me', function(response) {
      console.log('Successful login for: ' + response.name);
      document.getElementById('status').innerHTML =
        'Thanks for logging in, ' + response.name + '!';
    });
  }
function userlogin(){
    FB.login(function(response) {
       // handle the response, modify our button as needed.

           if (response.status === 'connected') {
            // Logged into your app and Facebook.
          } else if (response.status === 'not_authorized') {
            // The person is logged into Facebook, but not your app.
          } else {
            // The person is not logged into Facebook, so we're not sure if
            // they are logged into this app or not.
          }

     }, {scope: 'email'});
}

function userlogout(){
    FB.logout(function(response) {
       // Person is now logged out
    });
}

function removePerm(perm){
    FB.api('/me/permissions/'+perm+'', 'delete', callback);
    function callback(response) {
    //document.getElementById(''+perm+'').innerHTML = "" + response;
    document.location.reload();
    }
}
</script>

<div id="status"></div>