.

components/ui/language-switcher.tsx

@@ -13,7 +13,6 @@ export function LanguageSwitcher() {
   const currentLocale = pathname.split('/')[1] || i18nConfig.defaultLocale
 
   useEffect(() => {
-    // 第一次访问页面时，如果 URL 有语言，就记住
     if (typeof window !== 'undefined') {
       const saved = localStorage.getItem('preferred-language')
       if (!saved || saved !== currentLocale) {
@@ -29,15 +28,15 @@ export function LanguageSwitcher() {
       localStorage.setItem('preferred-language', newLocale)
     }
 
-    // 拆解当前路径
     const segments = pathname.split('/')
 
-    // 如果路径前缀是语言码，则替换
-    const isLocaleInPath = (i18nConfig.locales as unknown as string[]).includes(segments[1])
+    // ✅ 修复：类型断言 readonly -> string[]
+    const localeList = [...i18nConfig.locales] as string[]
+    const isLocaleInPath = localeList.includes(segments[1])
+
     if (isLocaleInPath) {
       segments[1] = newLocale
     } else {
-      // 否则插入语言前缀
       segments.unshift(newLocale)
     }