Вот ответ в ванильном JavaScript (без использования jQuery)
HTML
<a href="#" id="foo" class="foo">Text</a>
<br />
<button id="hide-button" onclick="hideButton()">Hide</button>
<button id="show-button" onclick="showButton()">Show</button>
JavaScript
const hideButton = () => {
document.getElementById("foo").classList.add('hidden');
}
const showButton = () => {
document.getElementById("foo").classList.remove('hidden');
}
CSS
.foo {
transition-property: visibility, opacity;
transition-duration: 0s, 1s;
}
.foo.hidden {
opacity: 0;
visibility: hidden;
transition-property: opacity, visibility;
transition-duration: 1s, 0s;
transition-delay: 0s, 1s;
}