WebMachine,
<!DOCTYPE html>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<style type="text/css">
a.hide{
display: none;
}
</style>
<script>
document.addEventListener( "DOMContentLoaded" , function() {
["one", "two", "three"].forEach(cls => document.querySelector(`a.${cls}`).classList.toggle("hide", !document.querySelector(`div.${cls}`)))
});
</script>
</head>
<body>
<a href="#" class="one">one</a>
<a href="#" class="two">two</a>
<a href="#" class="three">three</a>
<br>
Есть блоки:
<div class="one">содержимое one</div>
<div class="three">содержимое three</div>
</body>
</html>