如何从Javascript中的通用网页获取favicon的URL？

function getFaviconURL(url) {
  return new Promise((resolve, reject) => {
    fetch(url)
      .then((response) => response.text())
      .then((html) => {
        const parser = new DOMParser();
        const doc = parser.parseFromString(html, "text/html");
        const link = doc.querySelector("link[rel*='icon']");
        if (link) {
          resolve(link.href);
        } else {
          reject("Favicon not found");
        }
      })
      .catch((error) => reject(error));
  });
}

getFaviconURL("https://www.example.com")
  .then((faviconURL) => console.log(faviconURL))
  .catch((error) => console.error(error));

function getFaviconURL(url) {
  return new Promise((resolve, reject) => {
    const faviconURL = new URL("favicon.ico", url);
    fetch(faviconURL, { method: "HEAD" })
      .then((response) => {
        if (response.ok) {
          resolve(faviconURL.href);
        } else {
          reject("Favicon not found");
        }
      })
      .catch((error) => reject(error));
  });
}

getFaviconURL("https://www.example.com")
  .then((faviconURL) => console.log(faviconURL))
  .catch((error) => console.error(error));