.

components/ui/language-switcher.tsx

@@ -25,14 +25,22 @@ export function LanguageSwitcher() {
   const handleChange = (e: React.ChangeEvent<HTMLSelectElement>) => {
     const newLocale = e.target.value
 
-    // 保存用户选择
     if (typeof window !== 'undefined') {
       localStorage.setItem('preferred-language', newLocale)
     }
 
-    // 替换语言部分的路径
+    // 拆解当前路径
     const segments = pathname.split('/')
-    segments[1] = newLocale
+
+    // 如果路径前缀是语言码，则替换
+    const isLocaleInPath = i18nConfig.locales.includes(segments[1])
+    if (isLocaleInPath) {
+      segments[1] = newLocale
+    } else {
+      // 否则插入语言前缀
+      segments.unshift(newLocale)
+    }
+
     const newPath = segments.join('/')
 
     startTransition(() => {