TypeScript

class Person {
    /**
     * TS 可以再属性前增加属性的修饰符
     * public 修饰的属性可以再任意位置访问（修改）默认值
     * private 私有属性，私有属性只能在类内部进行访问和修改
     */

    public title: string; // 不加前缀其实就是public
    private name: string;
    private age: number;

    // 可以将前缀写在此处
    // constructor(public title: string, private name: string, private age: number) {

    constructor(title: string, name: string, age: number) {
        this.title = title;
        this.name = name;
        this.age = age;
    }

    // 可用get set方式来实现getName和setName
    getName() {
        return this.name
    }

    get _name() {
        return this.name
    }

    setName(val: string) {
        this.name = val
    }

    set _name(val: string) {
        this.name = val
    }

    getAge() {
        return this.age
    }

    setAge(val: number) {
        if (val >= 0) {
            this.age = val
        }
    }
}

const per = new Person('Front-end Developer', 'Alan', 11)
console.log(per, 'per');
console.log(per.getName(), 'per.getName()');
console.log(per._name, 'per._name');
per.setName('Faye')
console.log(per.getName(), 'per.getName()');
per._name = 'Alan Faye';
console.log(per._name, 'per._name');
per.setAge(-30);
console.log(per.getAge(), 'per.getAge()')
per.setAge(18);
console.log(per.getAge(), 'per.getAge()')