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;    }

var Person = new Class;Person.extend({   find:function(){},   exists:function(){}  });var person = Person.find(1);