Untitled

Trying to use data()
$('.solicitud_amistad').click(function(){
    var aux =  $(this);
    console.log($(this));
    console.log($(this).data('receptor'));
    $.post('amistad/nueva' , {id_receptor:$(this).data('receptor')},
        function(response){
            aux.replaceWith(response)
        }
    );
});

<a class="solicitud_amistad" data-receptor="4">Enviar solicitud de amistad</a>
undefined

jQuery.data(this, 'receptor');