diff --git a/server/public/index.html b/server/public/index.html
index e8729ed..6242558 100644
--- a/server/public/index.html
+++ b/server/public/index.html
@@ -368,6 +368,14 @@
             document.body.appendChild(overlay);
         }
 
+        function onImgThumbDblClick(img) {
+            const overlay = document.createElement('div');
+            overlay.className = 'fullscreen-overlay';
+            overlay.innerHTML = `<img src="${img.src}" style="max-width:100%;max-height:100%;object-fit:contain" alt="">`;
+            overlay.addEventListener('click', () => overlay.remove());
+            document.body.appendChild(overlay);
+        }
+
         function onBubbleDblClick(e) {
             e.stopPropagation();
             const bubble = e.currentTarget;
@@ -382,7 +390,7 @@
             document.body.appendChild(overlay);
         }
 
-        // 临时“输入中...”气泡
+        // 临时"输入中..."气泡
         function insertTempBubble() {
             clearTempBubble();
             const tempId = 'temp_' + Date.now();
@@ -391,10 +399,30 @@
             messagesContainer.insertAdjacentHTML('beforeend', renderMessageHTML(tempMsg));
             scrollToBottom();
             tempBubbleTimer = setTimeout(() => { clearTempBubble(); }, 8000);
+            // 降级轮询：如果 WebSocket 消息丢失，定时从服务端拉取
+            if (pollTimer) clearInterval(pollTimer);
+            let pollCount = 0;
+            pollTimer = setInterval(async () => {
+                pollCount++;
+                if (!currentRoom || pollCount > 5) { clearInterval(pollTimer); pollTimer = null; return; }
+                try {
+                    const token = getToken();
+                    const res = await fetch(API + `/api/rooms/${currentRoom}/messages`, { headers: { 'Authorization': `Bearer ${token}` } });
+                    const msgs = await res.json();
+                    const lastCacheId = messageCache.filter(m => !m.isTemp && !m.isPlaceholder).slice(-1)[0]?.id;
+                    const newMsgs = msgs.filter(m => !lastCacheId || m.id > lastCacheId);
+                    if (newMsgs.length) {
+                        clearInterval(pollTimer); pollTimer = null;
+                        clearTempBubble();
+                        newMsgs.forEach(m => appendMessage(m));
+                    }
+                } catch(e) {}
+            }, 2000);
         }
 
         function clearTempBubble() {
             if (tempBubbleTimer) { clearTimeout(tempBubbleTimer); tempBubbleTimer = null; }
+            if (pollTimer) { clearInterval(pollTimer); pollTimer = null; }
             messageCache = messageCache.filter(m => !m.isTemp);
             const tempEls = messagesContainer.querySelectorAll('[data-msg-id^="temp_"]');
             tempEls.forEach(el => el.remove());
@@ -404,6 +432,7 @@
         let wsReconnectTimer = null;
         let reconnectAttempts = 0;
         const MAX_RECONNECT_DELAY = 30000;
+        let pollTimer = null; // 降级轮询定时器
 
         function initWebSocket() {
             const token = getToken();
@@ -417,6 +446,7 @@
             };
             ws.onmessage = (e) => {
                 const data = JSON.parse(e.data);
+                console.log('📩 WS 收到:', data.type);
                 if (data.type === 'new_message') {
                     const msg = data.message;
                     if (currentRoom === msg.room_id) {
@@ -733,7 +763,7 @@
             const p = await res.json();
             document.getElementById('detail-title').textContent = p.item;
             let attachHtml = '';
-            if (p.attachments?.length) attachHtml = '<div class="attachments">' + p.attachments.map(a => `<img class="img-thumb" src="${a.file_path}" alt="${a.file_path}">`).join('') + '</div>';
+            if (p.attachments?.length) attachHtml = '<div class="attachments">' + p.attachments.map(a => `<img class="img-thumb" src="${a.file_path}" alt="${a.file_path}" ondblclick="onImgThumbDblClick(this)">`).join('') + '</div>';
             const historyHtml = p.history?.map(h => `<li><span class="history-time">${h.timestamp}</span> ${h.user}: ${h.action}</li>`).join('') || '';
             document.getElementById('detail-content').innerHTML = `
                 <div class="detail-row"><strong>数量：</strong>${p.quantity}</div>
diff --git a/server/server.js b/server/server.js
index 7b165ed..edc45b7 100644
--- a/server/server.js
+++ b/server/server.js
@@ -236,7 +236,7 @@ app.get('/api/rooms/:roomId/purchases/export', auth, (req, res) => {
 // WebSocket
 const clients = new Map();
 wss.on('connection', (ws, req) => {
-  //console.log('✅ WebSocket 客户端已连接');
+  console.log('✅ WebSocket 客户端已连接');
   const url = new URL(req.url, 'http://localhost');
   const token = url.searchParams.get('token');
   if (!token) return ws.close();