diff --git a/client/js/main.js b/client/js/main.js
index dcaa942..8c3dde2 100644
--- a/client/js/main.js
+++ b/client/js/main.js
@@ -65,7 +65,7 @@ import {
 // Set global configuration parameters
 window.config = {
 	wsAddress: 'wss://crypt.works/ws', // WebSocket 服务器地址 / WebSocket server address
-	debug: false                       // 是否开启调试模式 / Enable debug mode
+	debug: true                       // 是否开启调试模式 / Enable debug mode
 };
 
 // 把一些函数挂载到 window 对象上供其他模块使用
@@ -78,8 +78,6 @@ window.setupEmojiPicker = setupEmojiPicker;
 // 当 DOM 内容加载完成后执行初始化逻辑
 // Run initialization logic when the DOM content is fully loaded
 window.addEventListener('DOMContentLoaded', () => {
-	const loginContainer = $id('login-container');     // 登录容器 / Login container
-	const chatContainer = $id('chat-container');       // 聊天容器 / Chat container
 	const loginForm = $id('login-form');               // 登录表单 / Login form
 
 	if (loginForm) {
diff --git a/client/js/util.settings.js b/client/js/util.settings.js
index 81a76f7..6dcbc6f 100644
--- a/client/js/util.settings.js
+++ b/client/js/util.settings.js
@@ -92,9 +92,13 @@ function setupSettingsPanel() {
 					if (soundCheckbox) soundCheckbox.checked = false;
 					saveSettings(settings);
 					applySettings(settings);
-					new Notification('Notifications enabled', {
-						body: 'You will receive alerts here.'
-					})
+					// 防止重复通知，添加一个标志位
+					if (!panel._notificationShown) {
+						new Notification('Notifications enabled', {
+							body: 'You will receive alerts here.'
+						});
+						panel._notificationShown = true; // 设置标志位
+					}
 				} else {
 					settings.notify = false;
 					e.target.checked = false;
@@ -106,7 +110,11 @@ function setupSettingsPanel() {
 		} else {
 			settings.notify = false;
 			saveSettings(settings);
-			applySettings(settings)
+			applySettings(settings);
+			// 重置标志位
+			if (panel._notificationShown) {
+				panel._notificationShown = false;
+			}
 		}
 	});
 	on(soundCheckbox, 'change', e => {