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

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