// ==UserScript==
// @name       uniqueObserver 
// @author     xiaofeiwu
// @version      1.0.0
// ==/UserScript==

function observeNodeChanges(node, config, callback) {
  const observer = new MutationObserver(function (mutations) {
    mutations.forEach(function (mutation) {
      callback(mutation);
    });
  });
  observer.observe(node, config);
  return observer;
}