如何使用Ajax获取Cookie并设置Cookie短码

// 使用Ajax获取Cookie
var xhr = new XMLHttpRequest();
xhr.open('GET', 'https://example.com', true);
xhr.onreadystatechange = function () {
  if (xhr.readyState === 4 && xhr.status === 200) {
    var cookies = document.cookie.split(';');
    var cookieValue;
    for (var i = 0; i < cookies.length; i++) {
      var cookie = cookies[i].trim();
      if (cookie.indexOf('yourCookieName') === 0) {
        cookieValue = cookie.substring('yourCookieName'.length + 1);
        break;
      }
    }

    // 设置Cookie短码
    var shortCode = generateShortCode(); // 生成短码的方法
    document.cookie = 'shortCode=' + shortCode + '; expires=Fri, 31 Dec 9999 23:59:59 GMT; path=/'; // 设置短码Cookie
    console.log('Cookie短码设置成功');
  }
};
xhr.send();

// 生成Cookie短码的方法（示例）
function generateShortCode() {
  // 生成随机的短码值
  var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
  var length = 6;
  var shortCode = '';
  for (var i = 0; i < length; i++) {
    shortCode += chars.charAt(Math.floor(Math.random() * chars.length));
  }
  return shortCode;
}