Bukan Global Object ( namespace)

<!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>

var car = {
  manufacturer: 'Toyota',
  year: 2012,
  buy: function() {
    var p = document.createElement('p');
    p.textContent = 'buying a car: ' + this.manufacturer + ' ' + this.year;
    document.body.appendChild(p);
  }
}

var count = 0;
var int = setInterval(function() {
  if (count < 10) {
    car.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);
}