init

web/src/i18n/index.ts

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+import { createI18n } from 'vue-i18n'
+import zhCN from './zh-CN'
+import enUS from './en-US'
+
+// Supported languages
+export const supportedLanguages = [
+  { code: 'zh-CN', name: '中文', flag: '🇨🇳' },
+  { code: 'en-US', name: 'English', flag: '🇺🇸' },
+] as const
+
+export type SupportedLocale = (typeof supportedLanguages)[number]['code']
+
+// Detect browser language with improved logic
+function detectLanguage(): SupportedLocale {
+  // 1. Check localStorage for saved preference
+  const stored = localStorage.getItem('language')
+  if (stored && supportedLanguages.some((l) => l.code === stored)) {
+    return stored as SupportedLocale
+  }
+
+  // 2. Check browser language list (navigator.languages is more comprehensive)
+  const languages = navigator.languages || [navigator.language]
+  for (const lang of languages) {
+    const normalizedLang = lang.toLowerCase()
+    // Check for Chinese variants (zh, zh-CN, zh-TW, zh-HK, etc.)
+    if (normalizedLang.startsWith('zh')) {
+      return 'zh-CN'
+    }
+    // Check for English variants
+    if (normalizedLang.startsWith('en')) {
+      return 'en-US'
+    }
+  }
+
+  // 3. Default to English
+  return 'en-US'
+}
+
+// Initialize language and set HTML lang attribute
+function initializeLanguage(): SupportedLocale {
+  const lang = detectLanguage()
+  document.documentElement.setAttribute('lang', lang)
+  return lang
+}
+
+const i18n = createI18n({
+  legacy: false,
+  locale: initializeLanguage(),
+  fallbackLocale: 'en-US',
+  messages: {
+    'zh-CN': zhCN,
+    'en-US': enUS,
+  },
+})
+
+export function setLanguage(lang: SupportedLocale) {
+  i18n.global.locale.value = lang
+  localStorage.setItem('language', lang)
+  document.documentElement.setAttribute('lang', lang)
+}
+
+export function getCurrentLanguage(): SupportedLocale {
+  return i18n.global.locale.value as SupportedLocale
+}
+
+export function getLanguageInfo(code: SupportedLocale) {
+  return supportedLanguages.find((l) => l.code === code)
+}
+
+export default i18n