Typescript再学习-类：带有访问修饰符的类（9）

//访问修饰符 private public protected readonly
class Teacher {
  private name: string; // 类的私有属性、外部访问不到
  public emial: string; // 任何地方都可以访问和修改
  protected age: number; //只能从这个类和子类中进行访问和修改
  readonly birth: Date; // 不可以变的
  constructor(name: string, email: string, age: number, birth: Date) {
    this.name = name;
    this.emial = email;
    this.age = age;
    this.birth = birth;
  }
  introduceTeacher() {
    console.log("我叫" + this.name);
    return `姓名：${this.name}，邮箱：${this.emial}，年龄：${this.age}，出生日期：${this.birth}`;
  }
  testPrivateParams() {
    return this.name;
  }
  changeProtectedParams() {
    this.age = 21;
    return this.age;
  }
  changePrivateParamsNmae