Data attributes and HASH [closed]

I have two tab buttons with data attributes ( data-tab ). When I click any of them they attached hash to the url. I need logic in which when data attribute of the button is equl to the current hash in the url to add active class to that button.

<div class="switcher-container fade-el">
  <a href="#tab1" class="tab" data-tab="tab1">Tab1</a>
  <a href="#tab2" class="tab" data-tab="tab2">Tab2</a>
</div>