npm i vue-i18n@8.22.2

import Vue from 'vue'
import VueI18n from 'vue-i18n' // 引入國際化插件包
import Cookies from 'js-cookie'
import elementEnLocale from 'element-ui/lib/locale/lang/en' // element-ui 英文包
import elementZhLocale from 'element-ui/lib/locale/lang/zh-CN'// element-ui 中文包
import customEN from './en'  // 自定義英語包
import customZH from './zh'  // 自定義中文包

Vue.use(VueI18n) // 全局注冊國際化包

const messages = {
    en: {
        ...customEN,
        ...elementEnLocale
    },
    zh: {
        ...customZH ,
        ...elementZhLocale
    }
}
export function getLanguage() {
    const chooseLanguage = Cookies.get('language')
    if (chooseLanguage) return chooseLanguage

    // 如果沒有選擇語言
    const language = (navigator.language || navigator.browserLanguage).toLowerCase()
    const locales = Object.keys(messages)
    for (const locale of locales) {
        if (language.indexOf(locale) > -1) {
            return locale
        }
    }
    return 'en' // 默認(rèn)語言
}
const i18n = new VueI18n({
    locale: getLanguage(),
    messages
})

export default i18n

export default {
    navbar: {
        welcomes: '歡迎使用',
        companyName: '后臺管理系統(tǒng)',
    },
}

export default {
    navbar: {
        welcomes: 'welcome to use',
        companyName: 'backstage management system',
    }
}

import i18n from '@/lang'

// 加入到根實(shí)力配置中
new Vue({
  el: '#app',
  router,
  store,
  i18n,
  render: h => h(App)
})

<div class="dashboard-editor-container">
    {{ $t('navbar.welcomes') }} {{ $t('navbar.companyName') }}
</div>

Vue.use(Element, {
  size: Cookies.get('size') || 'medium' ,  // set element-ui default size
  i18n: (key, value) => i18n.t(key, value) 
})

<template>
    <el-dropdown trigger="click" @command="changeLanguage">
      <div>
        <svg-icon class-name="international-icon" icon-class="language" />
      </div>
      <el-dropdown-menu slot="dropdown">
        <el-dropdown-item command="zh" :disabled="'zh'=== $i18n.locale ">中文</el-dropdown-item>
        <el-dropdown-item command="en" :disabled="'en'=== $i18n.locale ">en</el-dropdown-item>
      </el-dropdown-menu>
    </el-dropdown>
  </template>
  
  <script>
  export default {
    computed: {
    language() {
      return this.$store.getters.language
    }
  },
    methods: {
      changeLanguage(lang) {
        this.$i18n.locale = lang // 設(shè)置給本地的i18n插件
        this.$store.dispatch('app/setLanguage', lang)
        this.$message.success('切換多語言成功')
      }
    }
  }
  </script>

import Lang from '@/components/Lang'

Vue.component('Lang', Lang)

      <!-- 語言包 -->
      <Lang class="right-menu-item"></Lang>