添加文章成功后，修改用户信息成功后，页面显示成功信息（flash messages）。

app/admin_service.py

@@ -97,7 +97,8 @@ def article():
                 return "Level must be between 1 and 5"
             add_article(content, source, level, question)
             _update_context()
-
+            title = content.split('\n')[0]
+            flash(f'Article added. Title: {title}')
     return render_template("admin_manage_article.html", **context)
 
 
@@ -119,7 +120,8 @@ def user():
         if username:
             if new_password:
                 update_password_by_username(username, new_password)
+                flash(f'Password updated to {new_password}')
             if expiry_time:
                 update_expiry_time_by_username(username, "".join(expiry_time.split("-")))
-    
-    return render_template("admin_manage_user.html", **context)
+                flash(f'Expiry date updated to {expiry_time}.')
+    return render_template("admin_manage_user.html", **context)

app/templates/admin_manage_article.html

@@ -30,6 +30,12 @@
         </div>
     </nav>
 
+    {% for message in get_flashed_messages() %}
+      <div class="alert alert-success" role="alert">
+        {{ message }}
+      </div>
+    {% endfor %}
+
     <div class="card" style="margin-top:24px;">
         {% if tips %}
         <div class="alert alert-success" role="alert">

app/templates/admin_manage_user.html

@@ -31,6 +31,12 @@
         </div>
     </nav>
 
+    {% for message in get_flashed_messages() %}
+      <div class="alert alert-success" role="alert">
+        {{ message }}
+      </div>
+    {% endfor %}
+
     <div class="card" style="margin-top:24px;">
         <h5 style="margin-top: 10px;padding-left: 10px;">重置选中用户的信息</h5>
         <form id="user_form" action="" method="post" class="container mb-3">