$(function(){
$('input[name = "order_submit"]').click(function(){
$.ajax({
url: "test.php",
type: "POST",
data: {"phone": $('input[name = "order_phone"]').val()},
success: function(res){
alert(res);
}
});
return false;
});
});
$_POST['phone'];
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js">
</script>