When I put var in front of method and url (var method, and var url) the code does not work.
function intervalcheck(theObject) {
  var xmlhttp = new XMLHttpRequest(),
    method = 'POST',
    url = 'https://thekmui.com/payb/payresult/result.php';
  xmlhttp.open(method, url, true);
  xmlhttp.onload = function () {
 
     
    