//基于原型的继承
if(typeof Object.create!=="function"){
   Object.create=function(o){
      function F(){}
	  F.prototype=o;
	  return new F();
   }
}
var Model={
   prototype:{
      init:function(){
		console.log('Model.prototype.init');
      },
	  find:function(){
	    console.log('Model.prototype.find');
	  }
   },
   inherited:function(){
      //console.log('exec inherited')
   },
   created:function(){
      //console.log('exec created!');
   },
   create:function(){
      var object=Object.create(this);
	  object.parent=this;
	  object.prototype=object.fn=Object.create(this.prototype);

	  object.created();//创建完成方法

	  this.inherited(object); //继承父类属性方法

	  return object;
   },
   init:function(){
      var instance=Object.create(this.prototype);
	  instance.parent=this;
	  instance.init.apply(instance,arguments);
	  return instance;
   },
   extend:function(o){
      for(var key in o){
	    this[key]=o[key];
	  }
   },
   include:function(o){
      for(var key in o){
	     this.prototype[key]=o[key];
	  }
   }
};
//类方法
Model.extend({
   records:{},
   initattr:function(o){
      var obj=this.init();
	  for(var key in o){
	    obj[key]=o[key];
	  }
	  return obj;
   },
   find:function(id){
      return this.records[id];
   }
});
Model.include({
   save:function(){
      this.parent.records[this.id]=this;
   }
});
var User=Model.create();
//类实例方法
User.include({
   getname:function(){
      console.log(this.name);
   }
});
var user=User.initattr({"name":"xuwm","age":12,"id":1});
user.save();
var u=User.find(1);
u.getname();