// 判断浏览器是否支持Local Storage
      function isLocalStorageSupported() {
        return typeof(Storage) !== "undefined";
      }

      // 设置Cookie
      function setCookie(name, value, times) {
        let date = new Date();
        date.setTime(date.getTime() + times);
        let expires = "expires=" + date.toUTCString();
        document.cookie = name + "=" + value + ";" + expires + ";path=/";
      }

      // 获取Cookie
      function getCookie(name) {
        let nameEQ = name + "=";
        let ca = document.cookie.split(';');
        for(let i = 0; i < ca.length; i++) {
            let c = ca[i].trim();
            if (c.indexOf(nameEQ) === 0) {
                return c.substring(nameEQ.length, c.length);
            }
        }
        return null;
      }

      // 删除Cookie
      function deleteCookie(name) {
        document.cookie = name + "=; expires=Thu, 01 Jan 1970 00:00:00 UTC; path=/;";
      }

      // 定义一个函数，获取本地存储的数据，并判断过期时间
      function getStorage(key) {
        if (isLocalStorageSupported()) {
          const val = localStorage.getItem(key);
          if (!val) {
            return {
              value: sessionStorage.getItem(key),
              expire: 0
            };
          }
        
          const data = JSON.parse(val);
          if (data.expire && data.expire + data.time < Date.now()) {
            localStorage.removeItem(key);
            return null;
          }
          return data;
        } else {
          // 如果不支持localStorage，使用cookie
          const val = getCookie(key);
          if (!val) {
            return {
              value: getCookie(key),
              expire: 0
            };
          } else {
            const data = JSON.parse(val);
            if (data.expire && data.expire + data.time < Date.now()) {
              deleteCookie(key);
              return null;
            }
            return data;
          }
        }
      }

      // 定义一个函数，设置本地存储的数据，并设置过期时间
      function setStorage(key, value, expire, time) {
        const now = new Date().getTime();
        const data = {
          value,
          time: time ? time : now,
          expire
        };

        if (isLocalStorageSupported()) {
          if (expire === 0) {
            window.sessionStorage.setItem(key, value);
            // setSessionCookie(key, value);
          } else {
            if (expire < 0 || (time && (time + expire) < now)) {
              window.localStorage.removeItem(key);
            } else {
              window.localStorage.setItem(key, JSON.stringify(data));
            }
          }
        } else {
          // 如果不支持localStorage，使用cookie进行存储
          if (expire < 0) {
            deleteCookie(key);
            return;
          } else {
            setCookie(key, JSON.stringify(data), expire);
          }
        }
      }

      // 设置会话级别的Cookie
      function setSessionCookie(name, value) {
        document.cookie = name + "=" + value + "; path=/; domain=www.dhresource.com; SameSite=None; Secure";
      }

      // 定义 Hub 类
      class Hub {
        constructor() {
          this._initListener();
          this.map = {
            setItem: (key, value, expire, time) => this.setItem(key, value, expire, time),
            getItem: (key) => this.getItem(key)
          };
          this._syncSessionStorageWithCookies();
        }

        // 重写 setItem ，实现过期处理，增加 expire 参数，expire默认是一年，滑动过期时间
        setItem(key, value, expire, time) {
          if (expire === void 0) {
            expire = 31536000000;
          }
          setStorage(key, value, expire, time);
        }

        // 重写 getItem ，实现过期处理，如果过期进行删除，返回 null；如果未过期，返回 value，并重新设置过期时间
        getItem(key) {
          return getStorage(key);
        }

        // 监听 client iframeWin.postMessage() 事件
        _initListener() {
          window.addEventListener('message', (e) => {
            if (!e || !e.data) return;
            const { method, key, value, id, expire, time } = e.data;
            if (!this.map[method]) return;

            const result = this.map[method](key, value, expire, time);
            let response;
            if (!result) {
              response = {
                id,
                key,
                result: null
              };
            } else {
              response = {
                id,
                key,
                expire: result.expire,
                result: result.value,
                time: result.time
              };
            }
            window.parent.postMessage(response, '*');
          });
        }

        // 同步 sessionStorage 与 会话级别的 Cookie
        _syncSessionStorageWithCookies() {
          const cookies = document.cookie.split(';');
          cookies.forEach(cookie => {
            const [key, value] = cookie.split('=').map(c => c.trim());
            if (key && value && !sessionStorage.getItem(key)) {
              sessionStorage.setItem(key, value);
            }
          });
        }
      }