SOURCE

class User {
    constructor(name,auth){
        this.name = name;
        this.auth = auth;
    }
}

class UserFactory{
    static createUser(name,auth){
        if(auth === 'admin') {
            return new User(name,1)
        }
        if(auth === 'user'){
            return new User(name,2)
        }
    }
}

const admin  = UserFactory.createUser("zhangsan",'admin')
const user = UserFactory.createUser("lisi","user");
console.log(admin);
console.log(user);