function ajax_get(url, callback) {
var xmlhttp = new XMLHttpRequest();
xmlhttp.function() {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
console.log('responseText:' + xmlhttp.responseText);
try {
var data = JSON.parse(xmlhttp.responseText);
} catch(err) {
console.log(err.message + " in " + xmlhttp.responseText);
return;
}
callback(data);
}
};

xmlhttp.open("GET", url, true);
xmlhttp.send();
}
const questions;
ajax_get("http://localhost/ss.php", function(data) {
questions = data;
});


veriyi neden çekemiyorum.