After if condition hide two divs

How to hide two divs after true if condition?

if (Auth.getId() > 0) {
    document.getElementById('Div1').style.display = 'none';
    document.getElementById('Div2').style.display = 'none';
} else {
    document.getElementById('Div3').style.display = 'none';
}

It returns div2 and div3, but it should return only div3.