Javascript Basics for OOP

Related Javascript language features:

* Object.this
* Function.prototype
* Function.apply(func,[args])

A Class Template:

1, Class Factory

var Factory = function(C) {
    var F = typeof C.c === "function" ? C.c : function() {};
    F.prototype = C;
    return F;
};

2, Class Constructor

var Class = Factory({
    a: null,
    c: function(a) {
        this.a = (a) ? a : 0;
    },
    d: function() {
        return this.a;
    }
});

var obj = new Class(1);
alert(obj.d());

3, Class Inheritence

var Factory = function(C, P) {
    var F = null;
    if (arguments.length == 1) {
        F = typeof C.c === "function" ? C.c : function() {};
        F.prototype = C;
    } else if (arguments.length == 2) {
        F = typeof C.c === "function" ? C.c : function() {
            P.apply(this, arguments);
        };
        F.prototype = C;
        for (var property in P.prototype) {
            F.prototype[property] = P.prototype[property];
        }
    }
    return F;
};

var Class1 = new Factory({
    a: null,
    c: function(a) {
        this.a = (a) ? a : 0;
    },
    d: function() {
        return this.a;
    }
});

var Class2 = new Factory({
    b: null,
    c: function(a, b) {
        Class1.prototype.c.apply(this, arguments);
        this.b = (b) ? b : 0;
    },
    e: function() {
        return this.a + this.b;
    }
}, Class1);

var obj1 = new Class1(1);
var obj2 = new Class2(2, 3);
alert(obj.d());
alert(obj2.e());

That's all.