class Person {
    /**
     * TS 可以再屬性前增加屬性的修飾符
     * public 修飾的屬性可以再任意位置訪問（修改）預設值
     * private 私有屬性，私有屬性只能在類內部進行訪問和修改
     */

    public title: string; // 不加字首其實就是public
    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方式來實現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()')