Untitled

FB.login({scope: 'email'},function(response){
                if(response.status == 'connected'){
                    alert('I am connected')
                }
            });

FB.login(function(response){
            if(response.status == 'connected'){
                alert('I am connected')
            }
        },{scope: 'email'});

<!DOCTYPE html>
<html>
<body>
<div id="fb-root"></div>
<a href="#" onclick="getEmail();return false;">Get Email</a>
<script src="http://connect.facebook.net/en_US/all.js"></script>
<script>
  FB.init({ appId: '**AppID**', status: true, cookie: true, xfbml : true });

  function getEmail() {
    FB.login(function(response) {
      if (response.session && response.perms) {
        FB.api('/me',  function(response) {
            alert('Email: ' + response.email);
          }
        );
      }
    } , {perms:'email'});
}
</script>
</body>
</html>