The difference between Vue3 and Vue2: better internationalization support

Vue is a popular JavaScript framework for building user interfaces. Vue3 is the latest version and has many exciting new features and improvements compared to Vue2. One notable improvement is better internationalization (i18n) support. This article will introduce the differences between Vue3 and Vue2 in terms of internationalization and provide some code examples to illustrate these differences.

In Vue2, to achieve international support, we usually use the plug-in vue-i18n. It allows us to easily define and use internationalized strings in Vue components. However, since Vue2 uses string-based key-value pairs to store translated text, this makes the management of multi-language files complicated. In addition, internationalized string replacement in Vue2 also requires some tedious operations. The following is an example of Vue2 code using vue-i18n:

// main.js
import Vue from 'vue'
import VueI18n from 'vue-i18n'
import App from './App.vue'

Vue.use(VueI18n)

const i18n = new VueI18n({
  locale: 'en', // 默认语言为英文
  messages: {
    en: {
      welcome: 'Welcome to my app!'
    },
    zh: {
      welcome: '欢迎使用我的应用！'
    }
  }
})

new Vue({
  render: h => h(App),
  i18n
}).$mount('#app')

// App.vue
<template>
  <div>
    <p>{{ $t('welcome') }}</p>
  </div>
</template>

In the above code, we use the vue-i18n plug-in to define two language versions of the welcome message. In the App.vue component, we use the $t function to perform international string replacement.

In contrast, Vue3 provides native internationalization support, which is implemented through the Composition API (composition API). In Vue3, we can use the built-in createI18n function to initialize the internationalization object, and use the $t function to perform internationalization string replacement. The following is a code example using Vue3 internationalization:

// main.js
import { createApp } from 'vue'
import { createI18n } from 'vue-i18n'
import App from './App.vue'

const i18n = createI18n({
  locale: 'en', // 默认语言为英文
  messages: {
    en: {
      welcome: 'Welcome to my app!'
    },
    zh: {
      welcome: '欢迎使用我的应用！'
    }
  }
})

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

// App.vue
<template>
  <div>
    <p>{{ $t('welcome') }}</p>
  </div>
</template>

As can be seen from the above code, the internationalization support in Vue3 has become more concise and intuitive. We directly use the createI18n function to create international objects and use it as a plug-in. In the App.vue component, we can still use the $t function to perform international string replacement.

To sum up, Vue3 provides better support for internationalization than Vue2. Using Vue3's built-in internationalization capabilities, we can more easily manage multi-language files and perform string replacement. This makes developing multilingual applications easier and more efficient. I hope this article will help you understand the internationalization differences between Vue3 and Vue2.

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