使用Ajax获取javascript变量的值？

Question

Long time stackoverflow user but first time poster! I recently made a very simple little browser based game, and when I say simple I cannot stress this enough.

Anyway, the entire game logic is in one little javascript file. In that file I have a variable called value, and it contains the players score.

The user at any given time during gameplay is allowed to click Submit, and this then uses a php script to access and write their username and hopefully soon their score to my database.

The problem I am having and I know quite a few people new to Ajax have had is, how do I send the value of the javascript variable value to my php page which handles sending the variables to my database?

I have read quite a bit on this and can't seem to get it working. So starting from scratch, assume I have a functioning javascript file with the value variable containing the score. How do I send the score to the php file using ajax? Where would I place the Ajax code?

Thank you stackoverflow! Also I already know that javascript resides on the client side and php runs on the server side, I just would like to know how to properly send the score to the php file, that is all! Thanks again stackoverflow!

EDIT: Because I seem to be getting down voted this is what I have but it does not work:

My Ajax:

function ajaxCall() {alert("To AJAX: the value is: " + value);

    $.ajax
    (   {
            type: "POST",
            url: "handler.php",
            data: {'value' : value}, 
            success: function(response)
            { alert("The value was passed!")}
        }
    );};

ajaxCall();

Part of handler.php:

if(isset($_POST['value']))

{
$value = $_POST['value']."";
var_dump($value);
}

var_dump($_POST['value']);

Answer 1

Simply use this,

your ajax.js should contain this.

$(document).ready(function() {
   $("#submitscore").click(function(event){
     var user = $('#username').val();
     var value = document.getElementById('yourscore').innerHTML;
      $.post( 
         "submitscore.php",
         { username: user, score: value }
           );
  });
});

Your other file should have a button with the id "submitscore"

Hi, <input type="text" id="username" size="12"><br/>
Your Score is : <span id="yourscore">5000</span><br/>
<button id="submitscore">Submit Score</button>

And in that submit file, use this:

if(isset($_REQUEST['score'])||isset($_REQUEST['username']))
{
$username = $_REQUEST['username'];
$value = $_REQUEST['score'];
var_dump($value);
//Your Insertion/Updation Databse Script
}