fix anc no dialog

src/component/Common/AnnouncementDialog.tsx

@@ -31,11 +31,13 @@ const AnnouncementDialog = () => {
   const [lastAnnouncement, setLastAnnouncement] = useState("");
 
   useEffect(() => {
-    // 检查公告是否更新，如果更新了则清除"不再显示"状态
+    // 检查公告是否更新
     const hasAnnouncementChanged = announcement !== lastAnnouncement && lastAnnouncement !== "";
+
+    // 如果公告已更新，清除不再显示状态并强制显示
     if (hasAnnouncementChanged) {
-      // 使用set方法将其设置为null来清除不再显示状态
-      SessionManager.set("announcement_dismissed", null);
+      // 使用特殊标记来覆盖之前的设置
+      SessionManager.set("announcement_dismissed", "false");
     }
 
     // 更新上次显示的公告内容
@@ -44,16 +46,17 @@ const AnnouncementDialog = () => {
     }
 
     // 检查是否应该显示公告
-    const shouldShow =
-      announcementEnabled &&
-      announcement &&
-      announcement.trim() !== "" &&
-      !SessionManager.get("announcement_dismissed");
+    // 更健壮的检测逻辑：只有当设置为"true"时才视为不再显示
+    const dismissed = SessionManager.get("announcement_dismissed") === "true";
+    const shouldShow = announcementEnabled && announcement && announcement.trim() !== "" && !dismissed;
 
     if (shouldShow) {
       // 延迟显示，让页面加载完成
       const timer = setTimeout(() => setOpen(true), 1000);
       return () => clearTimeout(timer);
+    } else {
+      // 确保当不应该显示时关闭弹窗
+      setOpen(false);
     }
   }, [announcement, announcementEnabled, lastAnnouncement]);