javascript提交丢失$ _POST值

I have the following script

 $(document).ready(function(){
   $("#SoumettreCarte").submit(function(ev) {
    alert('ok');
    ev.preventDefault();

    ville="bonjour";

    $.post("../cartes/essai2.php", {ville:ville})
    .done(function (response) {
//         window.location.replace("http://localhost/projet2/cartes/essai2.php");

        });

 });
});

When i click on submit, i want it to redirect me to essai2.php, so i use window.location.replace, but then i lose the value of my $_POST. So my problem, is how to load another page after submitting a form with javascript without losing my $_POST. Thanks for your help.

When i try action="essai2.php", i don't get "ville" in my $_POST.

you can do like this

<form action="essai2.php" class ="SoumettreCarte" id="SoumettreCarte" method="post" > 
<input type="text" name="pays" id="pays">
<input type="hidden" name="lat" value=""> 
<input type="hidden" name="lng" value=""> 
<input type="submit" name="submit" id="soumettre" value="soumettre la carte" > 
</form>

in jquery part do like this

var lat = "some lattitude";
var lng = "some longtitude";

$("[name=submit]").click(function(e){

$("[name=lat]").val(lat);
$("[name=lng]").val(lng);
});

You can make a hidden field like this:

HTML

<input type="hidden" name="ville" id="ville">

You can change the input field's value like this:

JQUERY

$(document).ready(function(){
  ville = 'Bonjour';
  $("#ville").val(ville);
  //or $("[name=ville]").val(ville);
}

<form action="essai2.php" class ="SoumettreCarte" id="SoumettreCarte" method="post" >
<input type="text" name="pays" id="pays">
<input type="hidden" name="lat" value="">
<input type="hidden" name="lng" value="">
<input type="submit" name="submit" id="soumettre" value="soumettre la carte" >
</form> 
<script type="text/javascript"> 
 $.post("../cartes/essai2.php", data:$("#SoumettreCarte").serialize()) 
 .done(function (response) {

    });</script>

you can try this one..