页面重新加载并发送给自己的帖子

I have a php page that have $id=$_GET['id']; I want to make a select box that when you click on some option will reload the page (with the GET + a new value number in post).

I did that:

function test(){
    var id="<?= $id?>";
    $("#box").bind("change", function() {
        var val = $(this).val();
        $.ajax({
            url: '/somepage.php?id='+id,
            type: 'POST',
            data: {f: val}
        });
    });
}

Now its don't do anything (or do and i dont see it..)

If you want to reload page then why do you need Ajax assuming $id is your $_GET['id'] do this

function test(){
var id="<?= $id?>";
$("#box").bind("change", function() {
    var val = $(this).val();
      var newVal = parseInt(val)+parseInt(id);
       window.location.href='somepage.php?id='+newVal;
});
}