有关js继承的问题；

function Parent(){

        this.name = 'huachenyu'

      }

      function Child() {

        this.age = 12

      }

      Child.prototype = new Parent();      //Child继承Parent

      var test = new Child();

      alert(test.age)   //12

　　alert(test.name)  //huachenyu

 

　　function bro(){

        this.sex = 'boy'

      }

      bro.prototype = new Child();  //同理，bro继承Child

      var test1 = new bro();

      alert(test1.sex)  //boy