2013-03-27 1st

jsdoit.js

(function (win, doc, exports, undefined) {

    'use strict';

    var fnTest, initialize;
    
    fnTest = /xyz/.test(function(){xyz;}) ? /\b_super\b/ : /.*/;
    initialize = false;

    function Class() { /* noop. */ }

    Class.extend = function (props) {

        var SuperClass, prototype;
        
        SuperClass = this;
        
        initialize = true;
        prototype = new this();
        initialize = false;

        function Class() {
            if (initialize !== true && typeof this.init === 'function') {
                this.init.apply(this, arguments);
            }
        }

        for (var key in props) {
            var prop   = props[key],
                _super = SuperClass.prototype[key],
                isMethodOverride = (typeof prop === 'function' && typeof _super === 'function' && fnTest.test(prop));

            if (isMethodOverride) {
                prototype[key] = (function (fn, _super) {
                    return function () {
                        var ret,
                            tmp = this._super;

                        this._super = _super;

                        ret = fn.apply(this, arguments);

                        this._super = tmp;

                        return ret;
                    };
                }(prop, _super));
            }
            else {
                prototype[key] = prop;
            }
        }

        Class.prototype = prototype;
        Class.prototype.constructor = Class;
        Class.extend = SuperClass.extend;

        return Class;
    };

    exports.Class = Class;
}(window, window.document, window));

var Parson = Class.extend({
    init: function (name) {
        this.name = name;
    },
    say: function () {
        console.log(this.name);
    }, 
});

var Child = Parson.extend({
    init: function (name) {
        this._super(name);
        this.age = 4;
    },
    say: function () {
        this._super();
        console.log('And I am ' + this.age + ' years old!');
    }
});

var Grandson = Child.extend({
    init: function (name) {
        this._super(name);
        this.sex = 'male';
    },
    say: function () {
        this._super();
        console.log('I am ' + this.sex + '.');
    }
});

debugger;
var p = new Parson('hoge');
var c = new Child('fuga');
var g = new Grandson('bar');

p.say();
c.say();
g.say();