Антидаблклик

Array.prototype.forEach.call(document.querySelectorAll("a[href^='/'],a[href^='http'],button:not(.allow-dblclick)"), function(el) {
  el.addEventListener('click', function(e) {
      const a = this;
      if (a.dataset.dblclick_timer) {
          console.log('prevent dblclick');
          e.preventDefault();
          return;
      }
      a.dataset.dblclick_timer = window.setTimeout(function() {
          delete(a.dataset.dblclick_timer);
      }, 500);
  });
});