facebook - Facebookにログインしているが許可されていない場合に、Facebookでuser_idを取得するにはどうすればよいですか？

Question

FB.getLoginStatus(function(response) {
        if (response.status === 'connected') {
            // the user is logged in and has authenticated your
            // app, and response.authResponse supplies
            // the user's ID, a valid access token, a signed
            // request, and the time the access token 
            // and signed request each expire
            var uid = response.authResponse.userID;
            alert(uid);
        } else if (response.status === 'not_authorized') {
            // the user is logged in to Facebook, 
            // but has not authenticated your app
            // logged in and connected user, someone you know
            var uid = response.id;
            alert(uid);
        } else {
            // the user isn't logged in to Facebook.
            alert("the user isn't logged in to Facebook.");
        }
    });

not_authorizedのときにuidを取得する方法は？