OO

class.js

var Class = function (base, extend) {
    var parent = null;
    if (Object.prototype.toString.apply(base) == '[object Function]') {
        parent = base;
    } else {
        extend = base;
    }

    var fn = function () {
        this.initialize.apply(this, arguments);
    };

    if (parent) {
        var sub = function () {};
        parent.prototype.$super_initialize = parent.prototype.initialize;
        sub.prototype = parent.prototype;
        fn.prototype = new sub();
    }

    for (var method in extend) {
        if (extend.hasOwnProperty(method)) {
            fn.prototype[method] = extend[method];
        }
    }

    if (!fn.prototype.initialize) {
        fn.prototype.initialize = function () {};
    }

    fn.prototype.constructor = fn;

    return fn;
};