VanillaJSでgetter/setter

こうする

function Clazz() {
    let hoge = "hogehoge";

    this.setHoge = function(param) {
        hoge = param;
    };
    this.getHoge = function() {
        return hoge;
    };
}

const a = new Clazz();
const b = new Clazz();

a.setHoge("ほげほげ")
console.log(a.getHoge()); // ほげほげ
console.log(b.getHoge()); // hogehoge
console.log(a.hoge); // undefined