Vue i18n: Hướng dẫn thiết lập quốc tế hóa hoàn chỉnh với vue-i18n

// src/i18n.ts
import { createI18n } from 'vue-i18n'
import en from './locales/en.json'
import de from './locales/de.json'

const i18n = createI18n({
  legacy: false,           // Use Composition API mode
  locale: 'en',            // Default locale
  fallbackLocale: 'en',   // Fallback locale
  messages: { en, de },
})

export default i18n

// src/main.ts
import { createApp } from 'vue'
import App from './App.vue'
import i18n from './i18n'

const app = createApp(App)
app.use(i18n)
app.mount('#app')

// src/locales/en.json
{
  "nav": {
    "home": "Home",
    "about": "About",
    "settings": "Settings"
  },
  "greeting": "Hello, {name}!",
  "cart": {
    "itemCount": "no items | one item | {count} items"
  }
}

// src/locales/de.json
{
  "nav": {
    "home": "Startseite",
    "about": "Über uns",
    "settings": "Einstellungen"
  },
  "greeting": "Hallo, {name}!",
  "cart": {
    "itemCount": "keine Artikel | ein Artikel | {count} Artikel"
  }
}

<template>
  <div>
    <!-- Simple translation -->
    <h1>{{ $t('nav.home') }}</h1>

    <!-- With variables -->
    <p>{{ $t('greeting', { name: userName }) }}</p>

    <!-- In attributes -->
    <input :placeholder="$t('nav.settings')" />

    <!-- Composition API -->
    <p>{{ greeting }}</p>
  </div>
</template>

<script setup lang="ts">
import { useI18n } from 'vue-i18n'

const { t } = useI18n()
const userName = 'Alice'
const greeting = t('greeting', { name: userName })
</script>

<template>
  <div>
    <!-- Pipe-separated plurals -->
    <p>{{ $t('cart.itemCount', count) }}</p>

    <!-- Named plurals (recommended for complex languages) -->
    <p>{{ $t('orders', { n: orderCount }) }}</p>
  </div>
</template>

<!-- In your locale file: -->
<!-- "orders": "{n} order | {n} orders" -->

<template>
  <select v-model="locale">
    <option v-for="lang in availableLocales" :key="lang" :value="lang">
      {{ lang }}
    </option>
  </select>
</template>

<script setup lang="ts">
import { useI18n } from 'vue-i18n'

const { locale, availableLocales } = useI18n()
</script>

// src/i18n.ts
import { createI18n } from 'vue-i18n'

const i18n = createI18n({
  legacy: false,
  locale: 'en',
  fallbackLocale: 'en',
  messages: {},
})

export async function loadLocale(locale: string) {
  const messages = await import(`./locales/${locale}.json`)
  i18n.global.setLocaleMessage(locale, messages.default)
  i18n.global.locale.value = locale
}

export default i18n

// src/i18n.ts
import { createI18n } from 'vue-i18n'

const i18n = createI18n({
  legacy: false,
  locale: 'pt-BR',
  fallbackLocale: {
    'pt-BR': ['pt', 'en'],
    'zh-Hant-TW': ['zh-Hant', 'zh', 'en'],
    'es-419': ['es', 'en'],
    default: ['en'],
  },
  messages: {
    en: { /* ... */ },
    pt: { /* ... */ },
    'pt-BR': { /* ... */ },
  },
})