class_example.js

var MyClass = function() {
  this.myAttribute = 1;

  return this;
};

MyClass.classMethod = function() {
};

MyClass.prototype.instancMethod = function() {
};

// Instantiating a class
var instance = new MyClass();

// Calling an instance method
instance.instanceMethod();

// Calling a class method
MyClass.classMethod();

(function() {
  var _privateMethod, _privateAttribute;

  var MyClass = function() {
    this.myAttribute = 1;
    _privateAttribute = 2;

    return this;
  };

  MyClass.classMethod = function() {
  };

  MyClass.prototype.getPrivateAttribute = function() {
    return _privateAttribute;
  };

  MyClass.prototype.instancMethod = function() {
    _privateMethod.call(this); // Call the private method
  };

  _privateMethod = function() {
  };
})();

(function(global) {
  var MyClass = function() {
    return this;
  };

  global.MyClass = MyClass;
})(this);