Returns value from test.php file

ajax.js

function doSomething(xhr) {
        var test = xhr.responseText + 'was found';
        alert(test);
}
 
function ajaxReturn (file,func,data) {
        var xhr = new XMLHttpRequest();
 
        xhr.open("POST",file, false); // Adding in the false, means send will wait for a reply until continuing with the code.
        xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
        xhr.send(data);   

        if (xhr.readyState === 4 && xhr.status === 200) {
                func(xhr);
        }                    
}
 
ajaxReturn('test.php',doSomething);