So i wanted to open a new page replacing the current one, i found that the method should be putting the second parameter on _self but nothing happen...
By the way, if i use the _blank parameter or i left it empty it opens in a new page. The rest of the function works good, but i can't find a way to close the current page and open the new one that i want.
Here is the javascript and the html buttom that call the function.

    <button id=rgstr_btn type=submit class=btn btn-info onClick=store()>Register</button>   

      <script>

                function store() {

                localStorage.setItem('nome', nome.value);

                localStorage.setItem('pw', pw.value);

                window.open('url', '_self');

            }

</script>