From 41a48d063d5e9d7c0613900e59c0ba2a2b333a34 Mon Sep 17 00:00:00 2001
From: Evan Huang <evan.huang000@proton.me>
Date: Fri, 3 Jan 2025 20:25:28 +0800
Subject: [PATCH] Update demo.html

---
 demo.html | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/demo.html b/demo.html
index dc91696..4bed54a 100644
--- a/demo.html
+++ b/demo.html
@@ -193,6 +193,24 @@
             }
 
             state(18, 8)
+        
+          function isOldBrowser() {
+    // 检测一些浏览器支持的现代功能
+    const isModernBrowser = () => {
+        return 'fetch' in window && 'Promise' in window && 'assign' in Object && 'includes' in Array.prototype;
+    };
+
+    // 检查 User-Agent 字符串中是否包含一些已知的老旧浏览器标识
+    const userAgent = navigator.userAgent.toLowerCase();
+    const isOldBrowserByUA = /msie|trident|edge\/(1|12)/.test(userAgent);
+
+    return !isModernBrowser() || isOldBrowserByUA;
+}
+
+if (isOldBrowser()) {
+    alert("您的浏览器可能过时，某些功能可能无法正常使用。请考虑升级浏览器。");
+}
+
         </script>
     </div>
 </body>