JSFiddle - React, Tailwind, and code Playground

HTML

<input type="checkbox"/>
<a href="" data-onclick="createOrder" id="submit" class="disabled"><span>Оформить заказ</span></a>

CSS

a.disabled {
  pointer-events: none;
}

JavaScript

$('input[type=checkbox]').on('click', function() {
  if ($(this).prop('checked')) {
    $('#submit').removeClass('disabled');
  } else {
    $('#submit').addClass('disabled');
  }
});