类

继承

class Person {
    name: string;
    constructor(name: string) {
        this.name = name;
    }
}

class Student extends Person {
    constructor(name: string) {
        super(name)
    }
}

const s=new Student('123');
console.log(s.name);



class Person {
    name: string = '133'
}

class Student extends Person {
    getName() {
        return this.name;
    }
}

let s = new Student();
console.log(s.getName());

只读属性

• 只读属性可以在构造器中赋值，但是赋值之后就不可以被修改了

class Person{
    readonly name:string;
    constructor(name:string){
        this.name=name;
    }
}

const p =new Person('why');
console.log(p.name);

• 属性本身不能被修改，但是如果他是对象类型时，对象中不是可读的属性是可以进行修改的

class Person {
    readonly name: string;
    readonly friend: Person;
    age: number
    constructor(name: string, age: number, friend?: Person) {
        this.name = name;
        this.age = age;
        this.friend = friend;
    }
}
const p = new Person('wxy', 23, new Person('ccc', 45));

p.friend.age=90

console.log(p.friend);

访问器

//私有属性
class Person {
    private _name: string;
    constructor(name: string) {
        this._name = name
    }

    //访问器的setter和getter
    set name(newName) {
        this._name = newName
    }

    get name() {
        return this._name;
    }
}

const p=new Person('xx');
p.name='kdl'
console.log(p.name);


//tsc 编译的时候指定高一点的版本要不然访问器会报错 Tsc 2.ts -t es5

参考学习 ts https://blog.csdn.net/weixin_42215167/article/details/117756434