update

src/components/LanguageDetector.astro

@@ -0,0 +1,36 @@
+---
+import { pathHasLocale, getRelativeLocaleUrl } from 'astro:i18n';
+
+// 使用 pathHasLocale 安全判断当前路径是否已包含任何语言前缀（返回 boolean）
+const hasLocale = pathHasLocale(Astro.url.pathname);
+
+// 自动生成中文根路径
+const cnRootUrl = getRelativeLocaleUrl('cn', '');
+---
+
+<script is:inline define:vars={{ hasLocale, cnRootUrl }}>
+  (() => {
+    try {
+      // 当前路径已带有语言前缀（如 /cn/ 或 /en/），直接跳过
+      if (hasLocale) return;
+
+      // 避免重复跳转
+      if (sessionStorage.getItem('lang-redirect')) return;
+
+      // 判定浏览器偏好语言
+      const langs = navigator.languages || [navigator.language || 'en'];
+      const isZh = langs.some((l) => l.toLowerCase().startsWith('zh'));
+
+      if (!isZh) return;
+
+      sessionStorage.setItem('lang-redirect', '1');
+
+      // 拼接真实跳转路径
+      const { pathname, search, hash } = location;
+      const cleanPath = pathname === '/' ? '' : pathname;
+      const targetUrl = `${cnRootUrl}${cleanPath.replace(/^\//, '')}${search}${hash}`;
+
+      location.replace(targetUrl);
+    } catch (e) {}
+  })();
+</script>