.

components/ui/language-switcher.tsx

@@ -23,6 +23,10 @@ export function LanguageSwitcher() {
 
   const handleChange = (e: React.ChangeEvent<HTMLSelectElement>) => {
     const newLocale = e.target.value
+
+    // ✅ 同步设置 cookie，供 middleware.ts 使用
+    document.cookie = `preferred-language=${newLocale}; path=/; max-age=31536000` // 保存 1 年
+
     let segments = pathname === '/' ? [] : pathname.split('/').filter(Boolean)
 
     const isLocaleInPath = i18nConfig.locales.includes(segments[0] as any)

components/utility/home-redirector.tsx

@@ -23,6 +23,9 @@ export default function HomeRedirector() {
       return
     }
   
+    // ✅ 同步写入 cookie
+    document.cookie = `preferred-language=${preferred}; path=/; max-age=31536000` // 1 年
+  
     const pathLocale = currentPath.split('/')[1]
     const hasLocaleInPath = isValidLocale(pathLocale)
   
@@ -35,5 +38,6 @@ export default function HomeRedirector() {
     }
   }, [])
   
+
   return null
 }