From aad7e6f76f30245e57dd0ec7256584ec5bd7fe07 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=BB=9D=E5=B0=98?= <237809796@qq.com>
Date: Mon, 17 Aug 2026 10:11:47 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E5=A4=8D:=20=E6=9C=AC=E5=9C=B0?=
 =?UTF-8?q?=E5=AD=98=E5=82=A8=E5=86=99=E6=BB=A1=E9=9D=99=E9=BB=98=E4=B8=A2?=
 =?UTF-8?q?=E6=95=B0=E6=8D=AE=E2=80=94=E2=80=94=E5=A4=B1=E8=B4=A5=E5=91=8A?=
 =?UTF-8?q?=E8=AD=A6=20+=20=E5=AF=BC=E5=85=A5=E5=9B=BE=E7=89=87=E4=BD=93?=
 =?UTF-8?q?=E7=A7=AF=E9=97=B8=E9=97=A8?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/App.vue                           |  5 +++++
 src/components/modals/ImportModal.vue | 12 ++++++++++++
 src/core/store.ts                     | 24 ++++++++++++++++++++----
 3 files changed, 37 insertions(+), 4 deletions(-)

diff --git a/src/App.vue b/src/App.vue
index 5f77c9e..1d3c799 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -168,6 +168,11 @@ onMounted(() => {
   document.addEventListener('keydown', onKey)
 })
 
+/* 持久化失败告警 → toast（防止静默丢数据） */
+watch(() => store.saveWarning.text, (txt) => {
+  if (txt) toast(txt)
+})
+
 /* 文库关闭时若在首页且从文库加载了 deck 则切入编辑 */
 watch(libraryVisible, (now, prev) => {
   if (prev && !now && deckLoaded.value) {
diff --git a/src/components/modals/ImportModal.vue b/src/components/modals/ImportModal.vue
index 0b1a705..0423870 100644
--- a/src/components/modals/ImportModal.vue
+++ b/src/components/modals/ImportModal.vue
@@ -149,6 +149,18 @@ function doImport() {
   let insertedImages = 0
   let insertedSlides = 0
 
+  // 图片体积闸门：localStorage 约 5MB 字符上限，超限导入后刷新会丢图
+  if (images.length > 0) {
+    const imgChars = images.reduce((s, e) => s + (e.data?.length || 0), 0)
+    let deckChars = 0
+    try { deckChars = JSON.stringify(store.getDeck()).length } catch (e) { /* ignore */ }
+    const QUOTA_CHARS = 4_500_000
+    if (deckChars + imgChars > QUOTA_CHARS) {
+      emit('toast', '图片过大：导入后约 ' + ((deckChars + imgChars) / 1048576).toFixed(1) + 'MB，超本地存储上限（约 5MB），刷新可能丢失。请压缩图片、减少数量，或先清理文库/旧图')
+      return
+    }
+  }
+
   // 1. 图片 → 当前幻灯片
   if (images.length > 0) {
     if (images.length === 1) {
diff --git a/src/core/store.ts b/src/core/store.ts
index c992713..79bf303 100644
--- a/src/core/store.ts
+++ b/src/core/store.ts
@@ -100,10 +100,25 @@ let saveTimer: ReturnType<typeof setTimeout> | null = null
 /* ---------- 工具 ---------- */
 function clone<T>(o: T): T { return JSON.parse(JSON.stringify(o)) }
 
+/* ---------- 持久化告警（写入失败置位，供 UI 提示，避免静默丢数据） ---------- */
+const saveWarning = reactive({ text: '' })
+
+/** 安全写入 localStorage；失败时置告警（非静默），返回是否成功 */
+function safeSet(key: string, val: string): boolean {
+  try { localStorage.setItem(key, val); saveWarning.text = ''; return true }
+  catch (e) {
+    if (!saveWarning.text) {
+      saveWarning.text = '本地存储空间不足，最新改动可能未保存。请导出 JSON 备份，或删除部分图片/文库释放空间'
+    }
+    console.error('[u-ppt] 保存失败:', key, e)
+    return false
+  }
+}
+
 function scheduleSave() {
   if (saveTimer) clearTimeout(saveTimer)
   saveTimer = setTimeout(() => {
-    try { localStorage.setItem(LS_KEY, JSON.stringify(state.deck)) } catch (e) { /* 配额满等忽略 */ }
+    safeSet(LS_KEY, JSON.stringify(state.deck))
   }, SAVE_DELAY)
 }
 
@@ -475,7 +490,7 @@ function getCfg(): AiCfg {
 }
 
 function setCfg(cfg: AiCfg) {
-  localStorage.setItem(LS_CFG, JSON.stringify({ ...DEFAULT_CFG, ...cfg }))
+  safeSet(LS_CFG, JSON.stringify({ ...DEFAULT_CFG, ...cfg }))
 }
 
 /* ---------- 自定义主题：AI 配色建议应用后存储 ---------- */
@@ -578,7 +593,7 @@ function getLibrary(): LibItem[] {
   try { return JSON.parse(localStorage.getItem(LIB_KEY) || '[]') || [] } catch (e) { return [] }
 }
 function setLibrary(arr: LibItem[]) {
-  try { localStorage.setItem(LIB_KEY, JSON.stringify(arr)) } catch (e) {}
+  safeSet(LIB_KEY, JSON.stringify(arr))
 }
 function getActiveLibId() { return state.activeLibId }
 function setActive(id: string | null) {
@@ -666,7 +681,7 @@ function getChat(chatId: string): ChatMessage[] {
 
 /** 写入某个 chatId 的会话 */
 function setChat(chatId: string, msgs: ChatMessage[]) {
-  try { localStorage.setItem(CHAT_PREFIX + chatId, JSON.stringify(msgs)) } catch (e) {}
+  safeSet(CHAT_PREFIX + chatId, JSON.stringify(msgs))
 }
 
 /** 清除某个 chatId 的会话 */
@@ -691,6 +706,7 @@ function recoverBackup(): boolean {
 export const store = {
   // 状态（响应式）
   state,
+  saveWarning,
   // computed
   deck, slides, count, currentIndex, theme, selectedId, activeLibId,
   currentSlide, canUndo, canRedo,