Untitled

function Controller() {
 self = this;

 self.createObject = createObject;
  function createObject() {
   new ObjectTest(self);
  }

 self.createAlert = createAlert;
 function createAlert(text) {
  alert(text);
 }
}

function ObjectTest(controller) {
 this.controller = controller;
 this.controller.createAlert("test");
}

<body onload="new Controller.createObject()">

Uncaught TypeError: Object #<Controller> has no method 'createAlert'

<body onload="new Controller().createObject()">

function Controller() {
 self = this;
 self.createObject = function(){
   new ObjectTest(self);
 };
 self.createAlert = function(text) {
  alert(text);
 };
}

(new Controller).createObject()
// or
new Controller().createObject()

new Controller.createObject()
// which is like
new (Controller.createObject)()

<body onload="new Controller.createObject()">

<body onload="new Controller().createObject()">

var Controller = {
    createObject: function () {
        return new ObjectTest(this);
    },

    createAlert: function(text) {
        alert(text);
    }
}

<body onload="Controller.createObject()">