Magento2 access customerData

gistfile1.html

<script type="text/javascript">
    require(
        ['jquery', 'Magento_Customer/js/customer-data', 'domReady!'],    
        function($, customerData){
            $(function(){
                customerData.get('customer').subscribe(function(customer) {
                    alert("Name is" + customer.fullname);
                });
            });
        }
    );
</script>