Javascript Singleton with Self-writing Methods/Classes

gistfile1.js

/*var SocketRouter = function() {
       console.log('Socket Router initialization');

  SocketRouter = function() {
    console.log('But I already did something!');    
  };
};


var x1 = new SocketRouter();
var x2 = new SocketRouter();
var x3 = new SocketRouter();*/


function socketRouter() {
         console.log('Socket Router initialization');

  socketRouter = function() {
    console.log('But I already did something!');    
  };
  
  socketRouter.XX= function (){
      console.log ('Calling XX');
  };
};


var x1 = new socketRouter();
var x2 = new socketRouter();
var x3 = new socketRouter();
socketRouter.XX();


/*var doSomething = function(x) {
    console.log('Doing something useful initialization '+x);

  doSomething = function() {
    console.log('But I already did something!');    
  };
};


var a1 = new doSomething(1);
var a2 = new doSomething(2);
var a2 = new doSomething(3);*/