<!DOCTYPE html>
<html>

<head>
  <script src="car.js"></script>
</head>

<body>
  <script>
    //tunggu 5 detik, terus muat skrip plane.js
    setTimeout(function() {
      var scr = document.createElement('script');
      scr.src = 'plane.js';
      document.body.appendChild(scr);
    }, 3000);
  </script>


</body>

</html>
(function() {
  var manufacturer = 'Toyota';
  var year = 2012;

  function buy() {
    var p = document.createElement('p');
    p.textContent = 'buying a car: ' + manufacturer + ' ' + year;
    document.body.appendChild(p);
  }

  var count = 0;

  var int = setInterval(function() {
    if (count < 10) {
      buy();
    } else {
      clearInterval(int);
    }
    count++;
  }, 1000);

})();
var manufacturer = 'Boeing';
var year = 2015;
function buy(){
  var p = document.createElement('p');
  p.textContent = 'buying a plane: '+ manufacturer+' '+ year;
  document.body.appendChild(p);
}