《基于MVC的Javascript》

var Class = function(){
        var klass = function(){
            this.init.apply(this,arguments);
        }

        klass.prototype.init = function(){}

        klass.fn = klass.prototype;

        klass.fn.parent = klass;

        //对象的属性直接复制到类上
        klass.extend = function(obj){
            var extended = obj.extended;
            for(var i in obj){
                klass[i] = obj[i];
            }
            if(extended) extended(klass)
        }

        //对象的属性复制到类的原型中
        klass.include = function(obj){
            var included = obj.included;
            for(var i in obj){
                klass.fn[i] = obj[i];
            }
            if(included) included (klass)
        }

        return klass;
    }

使用extend（）函数来生成一个类，这个函数的参数是一个对象。通过迭代将对象的属性直接复制到类上：

var Person = new Class;

Person.extend({
   find:function(){},
   exists:function(){}
});

var person = Person.find(1);