Global Object

<!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 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);
}