diff --git a/server.py b/server.py
index 7061776..e4a3020 100644
--- a/server.py
+++ b/server.py
@@ -12,6 +12,9 @@ monkey.patch_all()
 app = Flask(__name__)
 
 A1 = ""
+# 确保在模块级别声明全局变量
+browser_context = None
+context_page = None
 
 
 def get_context_page(instance, stealth_js_path):
@@ -42,25 +45,25 @@ print("跳转小红书首页成功，等待调用")
 
 
 def sign(uri, data, a1, web_session):
-  try:
-    # Ensure the page is still valid and reload if necessary
-    if context_page.is_closed():
-      global browser_context, context_page
-      browser_context, context_page = get_context_page(playwright, stealth_js_path)
-      context_page.goto("https://www.xiaohongshu.com")
-      time.sleep(5)
-      context_page.reload()
-      time.sleep(1)
+    global browser_context, context_page  # 声明全局变量
+    try:
+        # 确保页面仍然有效，如果页面已关闭则重新初始化
+        if context_page is None or context_page.is_closed():
+            browser_context, context_page = get_context_page(playwright, stealth_js_path)
+            context_page.goto("https://www.xiaohongshu.com")
+            time.sleep(5)
+            context_page.reload()
+            time.sleep(1)
 
-    # Evaluate the JavaScript function
-    encrypt_params = context_page.evaluate("([url, data]) => window._webmsxyw(url, data)", [uri, data])
-    return {
-      "x-s": encrypt_params["X-s"],
-      "x-t": str(encrypt_params["X-t"])
-    }
-  except Exception as e:
-    print(f"Error during sign operation: {e}")
-    return {"error": str(e)}
+        # 执行 JavaScript 函数
+        encrypt_params = context_page.evaluate("([url, data]) => window._webmsxyw(url, data)", [uri, data])
+        return {
+            "x-s": encrypt_params["X-s"],
+            "x-t": str(encrypt_params["X-t"])
+        }
+    except Exception as e:
+        print(f"Error during sign operation: {e}")
+        return {"error": str(e)}
 
 
 @app.route("/sign", methods=["POST"])