JQuery Targeting Error

I am using the following code so that after login and password it is directed to the respective page. Locally it works, but when I upload to the server, it is giving Chrome error:

  

ERR_TOO_MANY_REDIRECTS

And in Firefox:

  

This problem can be caused by disabling or refusing to accept   cookies.

As I said earlier, locally it works perfectly. The code I am using for redirection is:

<script type="text/javascript">
$(document).ready(function(){
   $('#login-form').submit(function() {
     data = $('#login-form').serialize();
     $.post("validar.php",{
            d: data,
     },
      function (d) {
        console.log(d);
       if(d == 1){
           $('#myModal').modal('show');
        }else{
         var redirecionar = "sistema/";
        $(window.document.location).attr('href',redirecionar);
        }
      });
      return false;
    });
});
</script>

Remember that the system / directory exists.