title: Add a custom script on "place order" button on woocommerce checkout page
body: <p>I'm trying to add this script on "place order" button of woocommerce checkout page:</p>
  
  <pre><code>$('#place_order').addClass('disabled');
  </code></pre>
  
  <p>but If I put it inside the footer.php file it doesn't work. </p>
  
  <p>I've find a resource that suggests to me to override the woocommerce <code>checkout.js</code> file make a clone inside <code>/my-theme/woocommerce</code> folder but now I don't understand where to put my custom script in order to make it works.</p>
  
  <p>Thank you</p>