diff --git a/assets/image.png b/assets/image.png
new file mode 100644
index 0000000..88a6f21
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diff --git a/image.png b/image.png
new file mode 100644
index 0000000..88a6f21
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diff --git a/xuexiao/instance/student_course.db b/xuexiao/instance/student_course.db
index 966bf3f..8e8aa93 100644
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diff --git a/xuexiao/utils.py b/xuexiao/utils.py
index 58ed033..2d25dda 100644
--- a/xuexiao/utils.py
+++ b/xuexiao/utils.py
@@ -243,7 +243,7 @@ def login_required(f):
     def decorated(*args, **kwargs):
         if not session.get('user_id'):
             from flask import request, jsonify
-            if request.is_xhr or request.headers.get('Content-Type') == 'application/json':
+            if request.headers.get('X-Requested-With') == 'XMLHttpRequest' or request.headers.get('Content-Type') == 'application/json':
                 return jsonify({'error': '请先登录'}), 401
             flash('请先登录', 'warning')
             return redirect(url_for('login'))