diff --git a/modules/M22-bulletin/api.js b/modules/M22-bulletin/api.js
new file mode 100644
index 00000000..dd27bab9
--- /dev/null
+++ b/modules/M22-bulletin/api.js
@@ -0,0 +1,112 @@
+// ===== api.js =====
+// 知秋：API层封装·爸爸不用改·直接复制
+
+const API = {
+    // 是否使用模拟数据（mock）
+    // true = 用本地模拟数据（开发阶段）
+    // false = 用真实后端API（上线后改）
+    useMock: true,
+
+    // 模拟公告数据（至少3条，包含 title/content/channel/date）
+    mockData: [
+        {
+            id: 1,
+            title: "【光湖公告】3月10日服务器维护通知",
+            content: "各位工程师，3月10日22:00-23:00进行主域稳定性升级，期间公告栏可能短暂不可用。",
+            channel: "系统",
+            date: "2026-03-09"
+        },
+        {
+            id: 2,
+            title: "知秋奶瓶线·九连胜庆祝",
+            content: "恭喜爸爸完成EL-8大任务！环节5是实时数据接入，让公告栏真正活起来～",
+            channel: "知秋",
+            date: "2026-03-09"
+        },
+        {
+            id: 3,
+            title: "M22模块组件化重构完成",
+            content: "环节4已验收√ 现在公告栏支持频道切换、Hash路由、本地数据兼容。",
+            channel: "技术",
+            date: "2026-03-08"
+        }
+    ],
+
+    // 获取公告的主方法（爸爸调用这个方法就行）
+    async fetchBulletins() {
+        // 知秋：try/catch 包裹，错误统一处理
+        try {
+            let data;
+            
+            if (this.useMock) {
+                // 模拟网络延迟（1秒，让loading看得见）
+                await new Promise(resolve => setTimeout(resolve, 1000));
+                console.log("【知秋】使用mock数据：", this.mockData);
+                data = this.mockData;
+            } else {
+                // 真实API（等页页提供后替换）
+                const response = await fetch('https://api.guanghulab.com/bulletins');
+                if (!response.ok) {
+                    throw new Error(`HTTP错误：${response.status}`);
+                }
+                data = await response.json();
+                console.log("【知秋】真实API数据：", data);
+            }
+            
+            // 成功获取数据后，保存到缓存
+            this.saveToCache(data);
+            return data;
+            
+        } catch (error) {
+            console.error("【知秋】API获取失败：", error);
+            
+            // 尝试从缓存读取
+            const cached = this.loadFromCache();
+            if (cached) {
+                console.log("【知秋】从缓存读取数据：", cached);
+                return cached;
+            }
+            
+            // 没有缓存，抛出错误
+            throw error;
+        }
+    },
+
+    // 保存到缓存
+    saveToCache(data) {
+        try {
+            const cacheData = {
+                data: data,
+                timestamp: Date.now()  // 保存时间戳，后续可用于过期判断
+            };
+            localStorage.setItem('holoBulletin_cache', JSON.stringify(cacheData));
+            console.log("【知秋】已更新缓存");
+        } catch (e) {
+            console.warn("【知秋】缓存写入失败", e);
+        }
+    },
+
+    // 从缓存读取
+    loadFromCache() {
+        try {
+            const cached = localStorage.getItem('holoBulletin_cache');
+            if (!cached) return null;
+            
+            const { data, timestamp } = JSON.parse(cached);
+            // 可选：判断缓存是否过期（比如24小时）
+            const isExpired = Date.now() - timestamp > 24 * 60 * 60 * 1000;
+            if (isExpired) {
+                console.log("【知秋】缓存已过期");
+                return null;
+            }
+            
+            return data;
+        } catch (e) {
+            console.warn("【知秋】缓存读取失败", e);
+            return null;
+        }
+    }
+};
+
+// 这一行最重要！把API挂到window上，让script.js能找到
+window.API = API;
\ No newline at end of file
diff --git a/modules/M22-bulletin/index.html b/modules/M22-bulletin/index.html
index bc24daed..f8026fd3 100644
--- a/modules/M22-bulletin/index.html
+++ b/modules/M22-bulletin/index.html
@@ -17,16 +17,16 @@
             </div>
         </div>
 
-        <!-- 频道标签栏 -->
+              <!-- 频道标签栏 -->
         <div class="channel-bar">
-            <span class="channel active">全部</span>
-            <span class="channel">系统公告</span>
-            <span class="channel">开发动态</span>
-            <span class="channel">团队消息</span>
+            <span class="channel-tab active" data-channel="全部">全部</span>
+            <span class="channel-tab" data-channel="系统">系统公告</span>
+            <span class="channel-tab" data-channel="知秋">开发动态</span>
+            <span class="channel-tab" data-channel="技术">团队消息</span>
         </div>
 
         <!-- 公告列表 -->
-        <div class="bulletin-list">
+       <div class="bulletin-container">
             <!-- 置顶公告1 -->
             <div class="bulletin-card pinned">
                 <div class="pin-indicator">置顶</div>
@@ -123,11 +123,13 @@
         </div>
 
         <!-- 底部状态栏 -->
-        <div class="footer">
-            <span>共6条公告2条置顶</span>
-            <span class="footer-brand">HoloLake光湖系统</span>
-        </div>
+    <div class="footer">
+        <span>共6条公告2条置顶</span>
+        <span class="footer-brand">HoloLake光湖系统</span>
     </div>
+
+    <!-- JavaScript 文件引入 -->
+    <script src="api.js"></script>
     <script src="storage.js"></script>
     <script src="script.js"></script>
 </body>
diff --git a/modules/M22-bulletin/script.js b/modules/M22-bulletin/script.js
index a9a8fb8a..f227bc6b 100644
--- a/modules/M22-bulletin/script.js
+++ b/modules/M22-bulletin/script.js
@@ -1,160 +1,144 @@
-// ========== 确保 HoloLake 命名空间存在 ==========
-window.HoloLake = window.HoloLake || {};
+// ===== script.js =====
+// 知秋：主逻辑·动态渲染+loading+错误处理
 
-// ========== 页面加载完成后执行 ==========
-document.addEventListener('DOMContentLoaded', function() {
-    console.log('🚀 script.js 初始化');
-    
-    // 恢复所有状态
-    restoreState();
-    
-    // 绑定事件
-    bindEvents();
-    
-    // 更新布局信息
-    updateLayoutInfo();
-    
-    // 监听窗口大小变化
-    window.addEventListener('resize', function() {
-        updateLayoutInfo();
-    });
-});
+(function() {
+    // 状态变量
+    let allBulletins = [];          // 所有公告（从API拿）
+    let currentChannel = '全部';     // 当前频道（默认全部）
+    let loading = false;            // 是否正在加载
+    let error = null;               // 错误信息
 
-// ========== 恢复状态 ==========
-function restoreState() {
-    console.log('🔍 restoreState 开始...');
-    
-    try {
-        // 1. 恢复订阅状态
-        const isSubscribed = HoloLake.UserState.isSubscribed();
-        const subscribeBtn = document.querySelector('.subscribe-btn');
-        if (subscribeBtn) {
-            if (isSubscribed) {
-                subscribeBtn.classList.add('active');
-                subscribeBtn.textContent = '已订阅';
-            } else {
-                subscribeBtn.classList.remove('active');
-                subscribeBtn.textContent = '订阅';
-            }
+    // DOM元素
+    const container = document.querySelector('.bulletin-container');
+    const channelTabs = document.querySelectorAll('.channel-tab');
+
+    // 初始化
+    async function init() {
+        console.log("【知秋】M22公告栏·环节5启动");
+        await loadBulletins();       // 加载数据
+        render();                    // 初次渲染
+        setupEventListeners();       // 事件监听
+    }
+
+    // 加载公告（核心！）
+    async function loadBulletins() {
+        loading = true;
+        error = null;
+        render();  // 显示loading
+
+        try {
+            // 知秋：调用API.fetchBulletins拿数据
+            const data = await API.fetchBulletins();
+            allBulletins = data;
+            loading = false;
+            render();
+        } catch (err) {
+            console.error("加载失败：", err);
+            loading = false;
+            error = "网络开小差了，稍后重试～";
+            render();
         }
-        
-        // 2. 恢复已读公告
-        const readList = HoloLake.UserState.getReadBulletins();
-        const bulletinCards = document.querySelectorAll('.bulletin-card');
-        bulletinCards.forEach((card, index) => {
-            const bulletinId = `bulletin-${index}`;
-            if (readList.includes(bulletinId)) {
-                card.classList.add('read');
-            }
-        });
-        
-        // 3. 恢复选中频道
-        const activeChannel = HoloLake.UserState.getActiveChannel();
-        const channels = document.querySelectorAll('.channel');
-        channels.forEach(channel => {
-            const channelText = channel.textContent.trim();
-            if (channelText === activeChannel || (activeChannel === '全部' && channelText === '全部')) {
-                channel.classList.add('active');
-            } else {
-                channel.classList.remove('active');
-            }
-        });
-        
-        // 4. 更新最后访问时间
-        HoloLake.UserState.updateLastVisit();
-        
-        console.log('✅ 恢复已完成');
-    } catch (e) {
-        console.error('❌ 恢复失败:', e);
     }
-}
 
-// ========== 绑定事件 ==========
-function bindEvents() {
-    console.log('🔗 绑定事件...');
-    
-    // 订阅按钮
-    const subscribeBtn = document.querySelector('.subscribe-btn');
-    if (subscribeBtn) {
-        subscribeBtn.addEventListener('click', function() {
-            const newState = HoloLake.UserState.toggleSubscribe();
-            if (newState) {
-                this.classList.add('active');
-                this.textContent = '已订阅';
-            } else {
-                this.classList.remove('active');
-                this.textContent = '订阅';
-            }
-            console.log('📌 订阅状态:', newState ? '已订阅' : '未订阅');
-        });
-    }
-    
-    // 频道点击
-    const channels = document.querySelectorAll('.channel');
-    channels.forEach(channel => {
-        channel.addEventListener('click', function() {
-            // 更新UI
-            channels.forEach(c => c.classList.remove('active'));
-            this.classList.add('active');
-            
-            // 保存状态
-            const channelName = this.textContent.trim();
-            HoloLake.UserState.setActiveChannel(channelName);
-            
-            // 筛选公告（可选功能，这里先做简单筛选）
-            filterBulletinsByChannel(channelName);
-            
-            console.log('📺 切换到频道:', channelName);
-        });
-    });
-    
-    // 公告点击（标记已读）
-    const bulletinCards = document.querySelectorAll('.bulletin-card');
-    bulletinCards.forEach((card, index) => {
-        card.addEventListener('click', function() {
-            const bulletinId = `bulletin-${index}`;
-            
-            // 标记已读
-            if (!this.classList.contains('read')) {
-                this.classList.add('read');
-                HoloLake.UserState.markAsRead(bulletinId);
-                console.log('📖 已读公告:', bulletinId);
-            }
-        });
-    });
-}
+    // 渲染公告列表（使用环节4的createCard组件）
+    function render() {
+        if (!container) return;
 
-// ========== 按频道筛选 ==========
-function filterBulletinsByChannel(channelName) {
-    const cards = document.querySelectorAll('.bulletin-card');
-    
-    if (channelName === '全部') {
-        cards.forEach(card => {
-            card.style.display = 'flex';
-        });
-        return;
-    }
-    
-    cards.forEach(card => {
-        const tag = card.querySelector('.bulletin-tag');
-        if (tag && tag.textContent.trim() === channelName) {
-            card.style.display = 'flex';
-        } else {
-            card.style.display = 'none';
+        // 加载状态
+        if (loading) {
+            container.innerHTML = `
+                <div class="loading-state">
+                    <div class="spinner"></div>
+                    <p>知秋正在飞向服务器……</p>
+                </div>
+            `;
+            return;
         }
-    });
-}
 
-// ========== 更新布局信息 ==========
-function updateLayoutInfo() {
-    const width = window.innerWidth;
-    let mode = '桌面';
-    
-    if (width <= 480) {
-        mode = '手机';
-    } else if (width <= 768) {
-        mode = '平板';
+                // 错误状态
+        if (error) {
+            // 检查是否离线（断网）
+            const isOffline = !navigator.onLine;
+            const offlineHint = isOffline ? '📴 离线模式 · ' : '';
+            
+            container.innerHTML = `
+                <div class="error-state">
+                    <p>😢 ${offlineHint}${error}</p>
+                    <button class="retry-btn" id="retryBtn">重试</button>
+                </div>
+            `;
+            // 重试按钮事件（用事件委托，但这里直接绑一下）
+            const retryBtn = document.getElementById('retryBtn');
+            if (retryBtn) {
+                retryBtn.addEventListener('click', () => {
+                    loadBulletins();
+                });
+            }
+            return;
+        }
+
+        // 空数据状态
+        if (allBulletins.length === 0) {
+            container.innerHTML = `
+                <div class="empty-state">
+                    <p>✨ 暂无公告，稍后再来看看～</p>
+                </div>
+            `;
+            return;
+        }
+
+        // 正常渲染：根据频道筛选
+        const filtered = currentChannel === '全部'
+            ? allBulletins
+            : allBulletins.filter(item => item.channel === currentChannel);
+
+        if (filtered.length === 0) {
+            container.innerHTML = `
+                <div class="empty-state">
+                    <p>📭 这个频道暂时没有公告</p>
+                </div>
+            `;
+            return;
+        }
+
+        // 使用环节4的createCard（如果不存在就降级）
+        let html = '';
+        filtered.forEach(item => {
+            if (typeof createCard === 'function') {
+                html += createCard(item);
+            } else {
+                // 降级方案（保证显示）
+                html += `
+                    <div class="bulletin-card">
+                        <h3>${item.title}</h3>
+                        <p>${item.content}</p>
+                        <div class="meta">
+                            <span class="channel">${item.channel}</span>
+                            <span class="date">${item.date}</span>
+                        </div>
+                    </div>
+                `;
+            }
+        });
+        container.innerHTML = html;
     }
-    
-    console.log(`📱 当前布局: ${mode}模式 (${width}px)`);
-}
\ No newline at end of file
+
+    // 事件监听（频道切换）
+    function setupEventListeners() {
+        channelTabs.forEach(tab => {
+            tab.addEventListener('click', (e) => {
+                // 移除所有active
+                channelTabs.forEach(t => t.classList.remove('active'));
+                // 当前加active
+                e.target.classList.add('active');
+                // 更新频道
+                currentChannel = e.target.dataset.channel || '全部';
+                // 重新渲染（不用再加载数据，用已有的allBulletins）
+                render();
+            });
+        });
+    }
+
+    // 启动一切
+    init();
+})();
\ No newline at end of file
diff --git a/modules/M22-bulletin/style.css b/modules/M22-bulletin/style.css
index cebd5b9e..41576001 100644
--- a/modules/M22-bulletin/style.css
+++ b/modules/M22-bulletin/style.css
@@ -63,7 +63,7 @@ body {
 }
 
 /* ========== 频道栏 ========== */
-.channel-bar {
+.channel-tab-bar {
     display: flex;
     gap: 8px;
     padding: 16px 0;
@@ -71,7 +71,7 @@ body {
     overflow-x: auto;
 }
 
-.channel {
+.channel-tab {
     padding: 8px 18px;
     border-radius: 20px;
     border: 1px solid rgba(255,255,255,0.1);
@@ -83,12 +83,12 @@ body {
     white-space: nowrap;
 }
 
-.channel:hover {
+.channel-tab:hover {
     border-color: rgba(255, 183, 77, 0.3);
     color: #b0bec5;
 }
 
-.channel.active {
+.channel-tab.active {
     background: rgba(255,183,77,0.15);
     border-color: #ffb74d;
     color: #ffb74d;
@@ -224,24 +224,24 @@ body {
   header h1 {
     font-size: 18px;
   }
-  .channel-bar {
+  .channel-tab-bar {
     gap: 6px;
     padding: 12px 0;
   }
-  .channel {
+  .channel-tab {
     padding: 6px 14px;
     font-size: 12px;
   }
   .bulletin-card {
     padding: 12px 10px;
   }
-  .channel-bar {
+  .channel-tab-bar {
     flex-wrap: nowrap;
     overflow-x: auto;
     -webkit-overflow-scrolling: touch;
     scrollbar-width: none;
   }
-  .channel-bar::-webkit-scrollbar {
+  .channel-tab-bar::-webkit-scrollbar {
     display: none;
   }
   .bulletin-card {
@@ -330,11 +330,11 @@ body {
         height: 32px;
     }
     
-    .channel-tabs {
+    .channel-tab-tabs {
         gap: 8px;
     }
     
-    .channel-tab {
+    .channel-tab-tab {
         padding: 6px 12px;
         font-size: 0.9rem;
     }
@@ -369,7 +369,7 @@ body {
         margin-bottom: 4px;
     }
     
-    .channel-tabs {
+    .channel-tab-tabs {
         overflow-x: auto;
         white-space: nowrap;
         flex-wrap: nowrap;
@@ -379,11 +379,11 @@ body {
         scrollbar-width: none; /* Firefox隐藏滚动条 */
     }
     
-    .channel-tabs::-webkit-scrollbar {
+    .channel-tab-tabs::-webkit-scrollbar {
         display: none; /* Chrome/Safari隐藏滚动条 */
     }
     
-    .channel-tab {
+    .channel-tab-tab {
         display: inline-block;
         float: none;
         white-space: nowrap;
@@ -394,4 +394,86 @@ body {
         text-align: center;
         gap: 8px;
     }
+}/* ===== 知秋：loading/error/empty 状态样式 ===== */
+
+/* loading */
+.loading-state {
+    text-align: center;
+    padding: 40px 20px;
+    color: #666;
+}
+
+.spinner {
+    width: 40px;
+    height: 40px;
+    margin: 0 auto 15px;
+    border: 3px solid #f3f3f3;
+    border-top: 3px solid #3498db;
+    border-radius: 50%;
+    animation: spin 1s linear infinite;
+}
+
+@keyframes spin {
+    0% { transform: rotate(0deg); }
+    100% { transform: rotate(360deg); }
+}
+
+/* error */
+.error-state {
+    text-align: center;
+    padding: 40px 20px;
+    color: #e74c3c;
+}
+
+.retry-btn {
+    background: #3498db;
+    color: white;
+    border: none;
+    padding: 8px 20px;
+    border-radius: 4px;
+    cursor: pointer;
+    font-size: 14px;
+    margin-top: 10px;
+    transition: background 0.3s;
+}
+
+.retry-btn:hover {
+    background: #2980b9;
+}
+
+/* empty */
+.empty-state {
+    text-align: center;
+    padding: 40px 20px;
+    color: #999;
+    font-size: 16px;
+}
+
+/* 响应式适配 */
+@media (max-width: 600px) {
+    .loading-state, .error-state, .empty-state {
+        padding: 30px 15px;
+    }
+    
+    .spinner {
+        width: 30px;
+        height: 30px;
+    }
+}/* ===== 频道栏和公告列表的间距 ===== */
+.channel-bar {
+    margin-bottom: 20px;  /* 给频道栏加下边距 */
+}
+
+/* 或者也可以给公告容器加上边距 */
+.bulletin-container {
+    margin-top: 10px;
+}
+/* ===== 频道栏与上方标题栏的间距 ===== */
+.channel-bar {
+    margin-top: 15px;     /* 给频道栏顶部增加间距，让它和上面的内容分开 */
+}
+
+/* 也可以调整标题栏的底部间距 */
+.header-actions {
+    margin-bottom: 5px;   /* 或者给标题栏底部加点间距 */
 }
\ No newline at end of file