クラス継承

///////////////////////////////////////////////////////////////////////
//
//　clazz
//
///////////////////////////////////////////////////////////////////////


var clazz = function (Parent, props) {

    var Child;
    var F;
    var i;

    //------------------------------------------
    //coustruct
    //------------------------------------------


    Child = function () {
        if (Child.uber && Child.uber.hasOwnProperty("__construct")) {
            Child.uber.__construct.apply(this, arguments);
        }
        if (Child.prototype.hasOwnProperty("__construct")) {
            Child.prototype.__construct.apply(this, arguments);
        }
    };


    //------------------------------------------
    //extends
    //------------------------------------------

    Parent = Parent || Object;
    F = function () {
    };
    F.prototype = Parent.prototype;
    Child.prototype = new F();
    Child.uber = Parent.prototype;
    Child.prototype.constructor = Child;


    //------------------------------------------
    //add methods
    //------------------------------------------

    for(i in props){

        if(props.hasOwnProperty(i)) {
            Child.prototype[i] = props[i];
        }
    }


    //------------------------------------------
    // return
    //------------------------------------------

    return Child;

};


//===========================================================
// clazz SAMPLE
//===========================================================


/**
 * Man
 */
var Man = clazz(null,
    {
        __construct:function (what) {
            alert("Man.__construct");
            this.name = what ;
        }

        ,getName:function () {
            return this.name;
        }
    }
);

/**
 * SuperMan
 */
var SuperMan = clazz(Man,
    {
        __construct:function(what){
            alert("SuperMan  __construct")
        }

        ,getName:function(){
            var name = SuperMan.uber.getName.call(this);
            return "I am " + name;
        }
    }
);


//
// 実行テスト
//
var superMan = new SuperMan("itoz");
alert(superMan.getName());//itoz