使用AJAX发送数据

Question

Here's the code I use and it doesn't work when I try echo $_POST['count']; on page.php

<input type="submit" value="go" id="more">
<script>
$(function(){
  $('#more').click(function(event) {
     event.preventDefault();

    $.ajax({
       type: "POST",
        url: "page.php",
        data: {"count":3} //saving number 3
        });

  });
 });
</script>

In page.php.

  <?php echo $_POST['count'];?> //doesn't work.

Answer 1

$number is undefined in your JavaScript. When this happens, most if not all browsers don't post the data. It is undefined because the variable doesn't exist in the JavaScript scope. I think you meant to echo the PHP value.

Try this

<?php  session_start(); 
 $_SESSION['n'] = 3;  
 $number = $_SESSION['n'];?>

<input type="submit" value="go" id="more">
<script>
$(function(){
  $('#more').click(function(event) {
     event.preventDefault();

    $.ajax({
       type: "POST",
        url: "page.php",
        data: {"count":<?php echo($number);?>}
        });

  });
 });
</script>