#TS# get/set

class Person {
    constructor() {
    }
    private _name: string;

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

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

let person = new Person();

// person._name = "apple";  // 無法訪問到_name變量

person.name = "apple";

console.log(person.name);  // 輸出 apple　　

就是為了隔離類的自有屬性和可暴露屬性。