This is how you create an AJAX request with optional GET parameters in vanilla JavaScript. Note that you need to be on the same domain for the AJAX call to work.
JavaScript
function recordAb(parameters) {
var xhttp = new XMLHttpRequest();
xhttp.open('GET', 'https://www.example.com/receiver.php', true);
xhttp.send();
}Usage
recordAb('?this=1&that=2');
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