访问react代码中的响应对象以获取cookie的值

function getCookieValue(cookieName) {
  const cookies = document.cookie.split(';');
  for (let i = 0; i < cookies.length; i++) {
    const cookie = cookies[i].trim();
    if (cookie.startsWith(cookieName + '=')) {
      return cookie.substring(cookieName.length + 1);
    }
  }
  return null;
}

const cookieValue = getCookieValue('cookieName');
console.log(cookieValue);