superclass.js

// author : youngershen
// email  : younger.x.shen@gmail.com
//

var SUPERCLASS = function(){};

(function(SUPERCLASS){
    
    SUPERCLASS = SUPERCLASS || {};
    var CLASS = SUPERCLASS;

    var set_builder_func = function(prop){
        return function(value){
            if(this.super[prop] == undefined){
                this[prop + '_value'] = value;

            }else if(this[prop] == undefined){

                this.super[prop] = value;
            }
        
        };
    };

    var get_builder_func = function(that, prop){
        return function(){
            return (function(prop){
                return function(){
                    if(that[prop + '_value'] != undefined){
                        return that[prop + '_value'];
                    }else{
                        return that.super[prop];
                    }
                }();
            })(prop);
        }
    };
    CLASS.extend = function(prop){
        var this_super = {};
        var initializing = false;
        var METACLASS = function(){
            if(initializing && this.init && arguments.length != 0){
                this.super = this_super;
                this.init.apply(this, arguments);
                for(var prop in this){
                    if((typeof this[prop]) != 'function'){

                        if(this.super[prop] == undefined && prop != 'super'){
                            this[prop + '_value'] = this[prop];
                        }
                        if(prop == 'super'){
                            for(var _prop in this[prop]){
                                if((typeof this[prop][_prop]) != 'function'){
                                    Object.defineProperty(this, _prop,{
                                        enumerable:true,
                                        configurable:true,
                                        set:set_builder_func(_prop),
                                        get:get_builder_func(this, _prop)
                                    });
                                }
                            }
                        }else{
                            Object.defineProperty(this,prop, {
                                enumerable:true,
                                configurable:false,
                                set:set_builder_func(prop),
                                get:get_builder_func(this, prop)
                            });
                        }
                    }
                }
            }
        };     
        var supertype = this.prototype;
        var prototype = new this();
        initializing = true;
        if((this instanceof Function)){
            for(var property in prop){
                if(typeof prop[property] == "function" && typeof supertype[property] == 'function'){
                    this_super[property] = supertype[property]
                    prototype[property] = prop[property];  
                }else if((typeof prop[property] == 'function')){
                    prototype[property] = prop[property];
                }
            
            }
            METACLASS.extend = arguments.callee;
            METACLASS.prototype = prototype;
            METACLASS.constructor = METACLASS;
            supertype = null;
            prototype = null;
            return METACLASS;

        };
    } 

})(SUPERCLASS);

var Person = SUPERCLASS.extend({
    init:function(name,age){
        this.name = name;
        this.age = age;
    },
    say:function(){
        console.log(this.name);
        console.log(this.age)
    }

});


var Student = Person.extend({
        init:function(name, age, id){
            debugger;
            this.super.init(name, age);
            this.id = id;
        },
        say:function(){
            this.super.say();
            console.log(this.id);
        },
        get_id:function(){
            console.log(this.id);
        }
    
    }
);

var GoodStudent = Student.extend({
    init:function(name, age, id, score){
        console.log(this.super.init);
        debugger;
        this.super.init();
        this.score = score;
    },
    score:function(){
        conosole.log(this.score);
    }

});


var p = new Person('younger', '28');
console.log(p.name);
console.log(p.age);
p.say();
console.log(p);

/*
var s = new Student('lily', 15, '123456');
s.say();
s.get_id();
console.log(s)
*/
var gs = new GoodStudent('hehe', 11, '123', 100);
console.log(gs);
gs.score();