使用 vue-i18n 切换中英文效果

npm install vue-i18n

import VueI18n from 'vue-i18n'
Vue.use(VueI18n)

const messages = {
 zh: {
  message: {
  hello: '好好学习，天天向上！'
  }
 },
 en: {
  message: {
  hello: 'good good study, day day up!'
  }
 }
}

const i18n = new VueI18n({
 locale: 'en', // 语言标识
 messages
})

const app = new Vue({
 router,
 i18n,
 ...App
}).$mount('#app')

<div id="app">
 <h1 style="font-size: 16px; text-align: center;">{{ $t("message.hello") }}</h1>
 </div>

const i18n = new VueI18n({
 locale: 'zh', // 语言标识
 messages
})

const i18n = new VueI18n({
 locale: 'en', // 语言标识
 messages: {
  'zh': require('./common/lang/zh'),
  'en': require('./common/lang/en')
 }
})

// 注意：一定是 exports，不是 export，否则会报错，报错信息是下列的中的内容不是 string
module.exports = {
 message: {
  title: '运动品牌'
 },
 placeholder: {
  enter: '请输入您喜欢的品牌'
 },
 brands: {
  nike: '耐克',
  adi: '阿迪达斯',
  nb: '新百伦',
  ln: '李宁'
 }
}

module.exports = {
 message: {
  title: 'Sport Brands'
 },
 placeholder: {
  enter: 'Please type in your favorite brand'
 },
 brands: {
  nike: 'Nike',
  adi: 'Adidas',
  nb: 'New Banlance',
  ln: 'LI Ning'
 }
}

// HTML
<div id="app">
 <div style="margin: 20px;">
  <h1>{{$t("message.title")}}</h1>
  <input style="width: 300px;" class="form-control" :placeholder="$t('placeholder.enter')">
  <ul>
  <li v-for="brand in brands">{{brand}}</li>
  </ul>
 </div>
</div>
// JS
data () {
 return {
  brands: [this.$t('brands.nike'), this.$t('brands.adi'), this.$t('brands.nb'), this.$t('brands.ln')]
 }
 },

function getCookie(name,defaultValue) {
 var arr, reg = new RegExp("(^| )" + name + "=([^;]*)(;|$)");
 if (arr = document.cookie.match(reg))
 return unescape(arr[2]);
 else
 return defaultValue;
}
export {
 getCookie
}

const i18n = new VueI18n({
 locale: getCookie('PLAY_LANG','zh'), // 语言标识
 messages: {
  'zh': require('./common/lang/zh'),
  'en': require('./common/lang/en')
 }
})

// template
<h2>{{$t('test')}}</h2>
<button type="button" class="btn btn-success" @click="changeLocale">中文/EN</button>  

// js方法
changeLocale () {
 this.$confirm(this.$t('layer.toggle'), this.$t('layer.tips'), {
  confirmButtonText: this.$t('button.ok'),
  cancelButtonText: this.$t('button.cancel'),
  type: 'warning'
  }).then(() => {
   let locale = this.$i18n.locale
   locale === 'zh' ? this.$i18n.locale = 'en' : this.$i18n.locale = 'zh'
  }).catch(() => {
    this.$message({
     type: 'info',
     })  
  })
},