diff --git a/js/ai-teacher-app.js b/js/ai-teacher-app.js
index ad53a17..12af1f9 100644
--- a/js/ai-teacher-app.js
+++ b/js/ai-teacher-app.js
@@ -10,7 +10,8 @@ export class AITeacherApp {
         this.pageNumPending = null;
         this.scale = 1.0;
         this.canvas = document.getElementById('pdf-canvas');
-        this.ctx = this.canvas.getContext('2d');
+        // this.ctx = this.canvas.getContext('2d');
+        this.ctx = this.canvas.getContext('2d', { willReadFrequently: true });
         this.messageTimeout = null;
         
         // Live2D控制器
@@ -790,6 +791,24 @@ export class AITeacherApp {
         }
     }
     
+        
+    showMessage(message, isError = false) {
+        const statusMessage = document.getElementById('status-message');
+        statusMessage.textContent = message;
+        statusMessage.className = isError ? 'error' : 'success';
+        statusMessage.style.display = 'block';
+        
+        // 清除之前的超时
+        if (this.messageTimeout) {
+            clearTimeout(this.messageTimeout);
+        }
+        
+        // 3秒后隐藏消息
+        this.messageTimeout = setTimeout(() => {
+            statusMessage.style.display = 'none';
+        }, 3000);
+    }
+
     async loadVoices() {
         try {
             const response = await fetch(`http://${this.api_host}/api/voices`);
diff --git a/public/favicon.ico b/public/favicon.ico
new file mode 100644
index 0000000..5a57ce7
Binary files /dev/null and b/public/favicon.ico differ
diff --git a/server.py b/server.py
index dbfa85c..0ed0b5c 100644
--- a/server.py
+++ b/server.py
@@ -40,10 +40,12 @@ if not openai_api_key:
     logger.warning("OpenAI API key not found. AI explanation will use fallback mode.")
 
 # 加载设置
+# 尽量把密钥,服务器地址,端口之类的设置全部放到setting.json中
 try:
     with open('setting.json', 'r') as f:
         settings = json.load(f)
     port = settings.get('websocket_port', 6006)
+    TTS_BASE_URL = settings.get('TTS_BASE_URL', TTS_BASE_URL)
 except Exception as e:
     logger.error(f"Error loading settings: {e}")
     port = 6006
@@ -264,11 +266,14 @@ async def tts():
             'error': result["error"]
         })
 
-cache_explanation = {}
+cache_explanation = {"is_caching_flag":[]}
 # 这里使用异步执行的方式, 用于提前加载缓存的讲解
 async def generate_cache_explanation(page_num,voice,speed):
     global cache_explanation
-    if page_num not in cache_explanation and page_num > 0 and page_num <= pdfpages:
+    global pdfpages
+    global current_pdf_path
+    if page_num not in cache_explanation and page_num > 0 and page_num <= pdfpages and page_num not in cache_explanation["is_caching_flag"]:
+        cache_explanation["is_caching_flag"].append(page_num)
         text = extract_page_text(current_pdf_path, page_num)["page_text"]
         result = []
         result.append(generate_explanation(page_num, text))
@@ -276,7 +281,8 @@ async def generate_cache_explanation(page_num,voice,speed):
         cache_explanation[page_num] = result
         logger.info(f"已缓存讲解: {page_num}")
         
-    if page_num+1 not in cache_explanation and page_num+1 > 0 and page_num+1 <= pdfpages:
+    if page_num+1 not in cache_explanation and page_num+1 > 0 and page_num+1 <= pdfpages and page_num+1 not in cache_explanation["is_caching_flag"]:
+        cache_explanation["is_caching_flag"].append(page_num+1)
         text = extract_page_text(current_pdf_path, page_num+1)["page_text"]
         result = []
         result.append(generate_explanation(page_num+1, text))
@@ -284,7 +290,8 @@ async def generate_cache_explanation(page_num,voice,speed):
         cache_explanation[page_num+1] = result
         logger.info(f"已缓存讲解: {page_num+1}")
     
-    if page_num-1 not in cache_explanation and page_num-1 > 0 and page_num-1 <= pdfpages:
+    if page_num-1 not in cache_explanation and page_num-1 > 0 and page_num-1 <= pdfpages and page_num-1 not in cache_explanation["is_caching_flag"]:
+        cache_explanation["is_caching_flag"].append(page_num-1)
         text = extract_page_text(current_pdf_path, page_num-1)["page_text"]
         result = []
         result.append(generate_explanation(page_num-1, text))
@@ -355,14 +362,15 @@ async def load_pdf():
     global cache_explanation
     global pdfpages
     # 清空cache
-    cache_explanation = {}
+    # cache_explanation = {"is_caching_flag":[]}
     chat_history = []
     
     data = await request.json
     logger.info(f"加载PDF: {data}")
     pdf_path = data.get('path', './public/pdf/test.pdf')
 
-
+    if pdf_path != current_pdf_path:
+        cache_explanation = {"is_caching_flag":[]}
     try:
         # 检查PDF是否存在
         if not os.path.exists(pdf_path):
@@ -384,7 +392,7 @@ async def load_pdf():
         voice = 'zf_xiaoxiao'
         speed = 1.0
         start_time = time.time()
-        await generate_cache_explanation(0,voice,speed)
+        asyncio.create_task(generate_cache_explanation(0,voice,speed))
         logger.info(f"预加载讲解耗时: {time.time()-start_time}")
         return jsonify({
             'success': True,
diff --git a/setting.json b/setting.json
index a38ee6e..f7af4bb 100644
--- a/setting.json
+++ b/setting.json
@@ -1,6 +1,7 @@
 {
     "OPENAI_API_KEY":"your_openai_api_key_here",
     "VOICERSS_API_KEY":"your_voicerss_api_key_here",
+    "TTS_BASE_URL":"https://server.feng-arch.cn:52861",
     "websocket_port": 6006,
     "port": 6007
 }
\ No newline at end of file