JavaScript——面向对象原型继承与class继承

var Student={
        name:‘cl‘,
        age:19,
        run:function(){
            console.log(this.name+"run....");
        }
  };

  var xiaoming={
       name:"xiaoming"
  };

  var Bird={
       fly:function(){
            console.log(this.name+"fly...");
       }
  };

  //小明的原型是 Student
  xiaoming.__proto__=Bird;

//定义一个学生类
  class Student{

      constructor(name){
          this.name=name;
      }
      hello(){
         alert(‘hello‘);
      }
  }
  var xiaoming=new Student("xiaoming");

class xiaoStudent extends Student{
      constructor(name,grade){
         super(name);
         this.grade=grade;
      }

      myGrade(){
         alert(‘我是一名小学生‘);
      }
  }

  var xiaoming=new Student("xiaoming");
  var xiaohong=new xiaoStudent("xiaohong",1);