寄生组合式继承

  function inherObj(o){
      function F(){}
      F.prototype=o;
      return new F();
    }
    function inherPro(SubClass,SuperClass){
      var p = inherObj(SuperClass.prototype);
    //这一步是为了把构造函数指向SubClass实际对象
      p.constructor = SubClass;
      SubClass.prototype=p;
    }
    var book={
      name:‘js book‘,
      alikeBook:[‘css book‘,‘html book‘]
    };
    function SuperClass(name){
      this.name=name;
      this.colors=[‘red‘,‘blue‘,‘green‘];
    }
    SuperClass.prototype.getName=function(){console.log(this.name)};
    function SubClass(name,time){
      SuperClass.call(this,name);
      this.time=time;
    }
    inherPro(SubClass, SuperClass);//这一步就是用SubClass的原型去继承SuperClass的原型，继承的核心代码
    SubClass.prototype.getTime=function(){
      console.log(this.time);
    }
    //如果子类想重写父类，那就自己覆盖父类同名属性

var ins1 = new SubClass(‘js book‘, 2014);
    var ins2 = new SubClass(‘css book‘,2013);