用JavaScript创建一个Person类，Student类需要继承Person类的内容，并创建一个‘班级’数组存储Student类的对象

// 定义Person类
class Person {
  constructor(name, age, gender) {
    this.name = name;
    this.age = age;
    this.gender = gender;
  }

  introduce() {
    console.log(`Hi, I'm ${this.name}, ${this.age} years old, ${this.gender}.`);
  }
}

// 定义Student类，继承Person类
class Student extends Person {
  constructor(name, age, gender, grade) {
    super(name, age, gender);
    this.grade = grade;
  }

  introduce() {
    console.log(`Hi, I'm ${this.name}, ${this.age} years old, ${this.gender}. I'm in grade ${this.grade}.`);
  }
}

// 创建班级数组
let class1 = [];

// 添加学生信息
let student1 = new Student('Tom', 18, 'male', 10);
let student2 = new Student('Lucy', 17, 'female', 9);
let student3 = new Student('Jack', 18, 'male', 10);
class1.push(student1);
class1.push(student2);
class1.push(student3);

// 输出学生信息
for (let i = 0; i < class1.length; i++) {
  class1[i].introduce();
}

运行结果：

Hi, I'm Tom, 18 years old, male. I'm in grade 10.
Hi, I'm Lucy, 17 years old, female. I'm in grade 9.
Hi, I'm Jack, 18 years old, male. I'm in grade 10.