Um teste qualquer..

js

;(function () {
			var Plusplus = function (init) {
			// Verifica se foi usado new
				if ( !(this instanceof Plusplus) )	{
					return new Plusplus(init);
				}

			// Minha variável de ouro
				var number = init || 0;

			// Return var number
				this._getNumber_ = function () {
					return number;		
				}

			// Incrementa var number;
				this._plusplus_ = function () {
					number++;	
				}
			// end Plusplus
			}

		// Return number
			Plusplus.prototype.getNumber = function() {
				return this._getNumber_();
			};

		// Incrementa mais 1 e retorna o number
			Plusplus.prototype.setNumber = function() {
				this._plusplus_();

				return this._getNumber_();
			};

			if (!window.Plusplus) {
				window.Plusplus = Plusplus;
			}
		})();

		;(function () {

		var game = Plusplus(10),
			$a = document.querySelectorAll('#clickme')[0];

			$a.addEventListener('click', function (e) {
				e.preventDefault();

				this.innerHTML = 'Click me! '+ game.setNumber();
			});
		})();