test.js

(function () {
    'use strict';

    function something() {
        alert(counter);
    }

    var myObject = new function(){
        this.data = {
            counter: 0
        };
        this.method = function(){
            this.data.counter += 1 ;
        }
    };

    myObject.method();
    alert(myObject.data.counter);
})();