JSFiddle - React, Tailwind, and code Playground

HTML

<button rel="show" type="button" class="dva">Включить</button>
<button rel="hide" type="button" class="dva">Отключить</button>

<div id="mymodal" style="text-align: center;">
<a href="#win1" class="button button-green" id="block" >Модальное окно</a>
</div>

JavaScript

$(document).ready( function(){
	$('.dva').on('click', function(){
  	var th			=		$(this);
    var context	=		$('#mymodal');
    if( th.attr('rel') == 'show' ){ context.show(); }
    	else{ context.hide(); }
  });
} );