使用克隆的原型模式

var animal=function(){
      this.blood=100;
      this.attackLevel=1;
      this.defenseLevel=1;
};
var a=new animal();
a.blood=1000;
a.attackLevel=15;
a.defenseLevel=9;

//调用克隆方法
var cloneAnimal=Object.create(a);
console.log(cloneAnimal);//输出：Object{blood:1000,attackLevel:15,defenseLevel:9}

Object.create=Object.create||function(obj){
      var F=function(){};
      F.prototype=obj;
      return new F();  
}