fix undefined audioSegments and duplicate end-handler

app/static/js/chat.js

@@ -1,4 +1,31 @@
 // 页面加载完成后执行
+
+// ====== 音频队列处理 ======
+const audioQueue = [];
+let audioPlaying = false;
+
+function enqueueAudio(blob) {
+    audioQueue.push(blob);
+    playNextAudio();
+}
+
+function playNextAudio() {
+    if (audioPlaying || audioQueue.length === 0) return;
+    const blob = audioQueue.shift();
+    const audio = new Audio(URL.createObjectURL(blob));
+    audioPlaying = true;
+    audio.addEventListener('ended', () => {
+        audioPlaying = false;
+        playNextAudio();
+    });
+    audio.play();
+}
+
+// 顺序播放一组音频片段（用于重放）
+function playAudioSegments(segments) {
+    segments.forEach(seg => enqueueAudio(seg));
+}
+
 document.addEventListener('DOMContentLoaded', function() {
     // 加载机器人角色列表
     loadRobotCharacters();
@@ -202,6 +229,8 @@ function initChatForm() {
             const contentDiv = document.createElement('div');
             contentDiv.className = 'message-content';
             assistantElement.appendChild(contentDiv);
+            // 存储该消息对应的音频片段集合
+            const audioSegments = [];
             const timeDiv = document.createElement('div');
             timeDiv.className = 'message-time';
             timeDiv.textContent = getCurrentTime();
@@ -227,7 +256,15 @@ function initChatForm() {
                     if (raw.startsWith('event: end')) {
                         chatMessages.removeChild(typingIndicator);
                         streamEnded = true;
-                        break;
+                        // 为该消息添加重放按钮
+                        if (audioSegments.length > 0) {
+                            const replayBtn = document.createElement('button');
+                            replayBtn.className = 'btn btn-sm btn-outline-secondary ms-2 replay-btn';
+                            replayBtn.innerHTML = '<i class="bi bi-play-circle"></i> 重放音频';
+                            replayBtn.addEventListener('click', () => { playAudioSegments(audioSegments); });
+                            assistantElement.appendChild(replayBtn);
+                        }
+
                     }
 
                     if (!raw.startsWith('data:')) continue;
@@ -241,7 +278,8 @@ function initChatForm() {
                         } else if (obj.type === 'audio') {
                             const audioBytes = Uint8Array.from(atob(obj.content), c => c.charCodeAt(0));
                             const audioBlob = new Blob([audioBytes], { type: 'audio/wav' });
-                            new Audio(URL.createObjectURL(audioBlob)).play();
+                            audioSegments.push(audioBlob);
+                            enqueueAudio(audioBlob);
                         }
                     } catch (e) {
                         console.error('解析事件失败', e, payload);