<fb:login-button scope="public_profile,email" onlogin="checkLoginState();" auto_logout_link="true"></fb:login-button>

<script>
    window.fbAsyncInit = function() {
        FB.init({
            appId      : '<appId>',
            xfbml      : true,
            version    : 'v2.8'
        });
        FB.AppEvents.logPageView();
    };

    (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_FR/sdk.js";
        fjs.parentNode.insertBefore(js, fjs);
    }(document, 'script', 'facebook-jssdk'));

    function checkLoginState() {
        FB.getLoginStatus(function(response) {
            //console.log('Check login state');
            //console.log(response);
            statusChangeCallback(response);
        });
    }

    function statusChangeCallback(response) {

        if (response.status === 'connected') {
            console.log('Connected');
            testAPI();
        } else if (response.status === 'not_authorized') {
            console.log('Please log into this app');
        } else {
            console.log('Please log into Facebook.');
        }
    }

    function testAPI() {
        FB.login(function(response) {
            if (response.authResponse) {
                var access_token = response.authResponse.accessToken;
                FB.api(
                    '/me',
                    {fields: 'id,email,cover,name,first_name,last_name,age_range,link,gender,locale,picture,timezone,updated_time,verified'},
                    function (response) {
                        console.log('response');
                        console.log(response);
                    }
                );
            } else {
                console.log('User cancelled login or did not fully authorize.');
            }
        },{scope:'email'});
    }

    function testLogout() {
        FB.logout(function(response) {
            console.log(response);
        });
    }
</script>