How to switch languages in i18n in vue3

Reference link: https://vue-i18n.intlify.dev/guide/essentials/scope.html#local-scope-2

const i18n = createI18n({
  locale,
  default: 'zh-CN',
  messages: {
    'en-US': en,
    'zh-CN': cn
  }
})

i18n.global.locale = 'en-US'

After importing the i18n you created, you can change the language by modifying i18n.global.locale. It’s really super simple.