$.ajax({
url: '/script.php',
type: 'post',
data: {'btn_id': 123},
success: function (data, status) {
console.log(data)
},
error: function (xhr, desc, err) {
console.log(xhr);
console.log("Details: " + desc + "\nError:" + err);
}
});
<?php
// http://site.ru/script.php
$post = filter_input(INPUT_POST, FILTER_SANITIZE_STRING);
var_dump($post);
<div id="fb"><?php require("fb.php");?></div>
setInterval(function(){
$.get("fb.php", function(data){
$("#fb").html(data);
});
},1000);