Greasemonkey 스크립트에서 MutationObserver를 사용하여 `location.href`의 변경 사항을 감지하는 방법은 무엇입니까?

<code class="js">window.onload = function() {
    var bodyList = document.querySelector('body');

    var observer = new MutationObserver(function(mutations) {
        if (oldHref != document.location.href) {
            oldHref = document.location.href;
            // 执行相关的操作
        }
    });
    
    var config = {
        childList: true,
        subtree: true
    };
    
    observer.observe(bodyList, config);
};</code>

<code class="js">const observeUrlChange = () => {
  let oldHref = document.location.href;
  const body = document.querySelector('body');
  const observer = new MutationObserver(mutations => {
    if (oldHref !== document.location.href) {
      oldHref = document.location.href;
      // 执行相关的操作
    }
  });
  observer.observe(body, { childList: true, subtree: true });
};

window.onload = observeUrlChange;</code>