From b923352ea46a87fd838152453be5fa3c5ec0bf70 Mon Sep 17 00:00:00 2001
From: shy3130 <shy3130@users.noreply.github.com>
Date: Sun, 28 Jun 2026 22:15:53 +0800
Subject: [PATCH]

---
 frontend/src/lib/monitorBadge.ts | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/frontend/src/lib/monitorBadge.ts b/frontend/src/lib/monitorBadge.ts
index 6c1f128..be9ca52 100644
--- a/frontend/src/lib/monitorBadge.ts
+++ b/frontend/src/lib/monitorBadge.ts
@@ -20,7 +20,8 @@ const listeners = new Set<() => void>()
 function readSeen(): number {
   try {
     const v = localStorage.getItem(STORAGE_KEY)
-    return v ? parseInt(v, 10) || 0 : -1  // -1 = 未初始化
+    if (v === null) return -1  // 从未设置过 → 未初始化
+    return parseInt(v, 10) || 0
   } catch {
     return -1
   }
@@ -55,8 +56,9 @@ export function setCurrentTotal(total: number): void {
   // total=0 视为未初始化, 不更新 (避免渲染期 data=undefined 传 0 重置 lastSeen)
   if (total <= 0) return
 
-  // 首次初始化: 把已读基线设为当前总数
-  if (lastSeenTotal < 0) {
+  // 首次初始化: lastSeen <= 0 (从未设置 -1, 或历史为 0) → 把已读基线设为当前总数
+  // 否则 lastSeen=0 + total=1 会被误算成"1条未读" (首次进入就显示徽标的 bug)
+  if (lastSeenTotal <= 0) {
     lastSeenTotal = total
     writeSeen(total)
   }