类

// 类
export = {}
class Person {
    public name: string      // 默认就是 public
    private age: number      //私有属性
    protected readonly gender: boolean   // 内部或者子类才能访问  只读属性：只能声明或者构造函数中去赋值 二选一 
    constructor (name: string, age: number) {
        this.name = name
        this.age = age
        this.gender = true
    }
    sayHai (msg: string): void {
        console.log(`Hai, I am ${this.name}, ${msg}`)
    }
}
const tom = new Person('tom', 28)
console.log(tom.name)
// 这里报错，不能在外部访问其私有属性
// console.log(tom.age)
// 内部或者子类才能访问
// console.log(tom.gender)
class Student extends Person {
    constructor (name: string, age: number) {
        super(name, age)
        // 字类中可以访问父类中受保护的属性
        console.log(this.gender)
    }
}
const tom2 = new Person('tom2', 23)