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diff --git a/UI source code/dns_mapping_ui-master/src/lang/index.js b/UI source code/dns_mapping_ui-master/src/lang/index.js
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+++ b/UI source code/dns_mapping_ui-master/src/lang/index.js
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+// lang index.js
+
+import Vue from 'vue'
+import VueI18n from 'vue-i18n'
+import Cookies from 'js-cookie'
+// import { key2Culture } from '@/utils'
+import elementEnLocale from 'element-ui/lib/locale/lang/en' // element-ui lang
+import elementZhLocale from 'element-ui/lib/locale/lang/zh-CN'// element-ui lang
+import enLocale from './en'
+import zhLocale from './zh'
+
+Vue.use(VueI18n)
+
+// https://www.cnblogs.com/scode2/p/9098579.html
+// https://www.jianshu.com/p/df2550c6f1be
+// https://blog.csdn.net/Dream_xun/article/details/82743762
+const messages = {
+  'en': {
+    ...enLocale,
+    ...elementEnLocale
+  },
+  'zh': {
+    ...zhLocale,
+    ...elementZhLocale
+  }
+}
+export function getLanguage() {
+  const chooseLanguage = Cookies.get('language')
+  if (chooseLanguage) return chooseLanguage
+
+  // if has not choose language
+  let localeLang = 'zh'
+  const language = (navigator.language || navigator.browserLanguage).toLowerCase()
+  const locales = Object.keys(messages)
+  for (const locale of locales) {
+    if (language.indexOf(locale) > -1) {
+      // return locale
+      localeLang = locale
+      break
+    }
+  }
+
+  // save to cookie
+  Cookies.set('language', localeLang)
+  // const culture = key2Culture(localeLang)
+  // Cookies.set('.AspNetCore.Culture', `c=${culture}|uic=${culture}`)
+  Cookies.set('.AspNetCore.Culture', `c=${localeLang}|uic=${localeLang}`)
+
+  return localeLang
+}
+const i18n = new VueI18n({
+  // set locale
+  // options: en | zh | zh-tw
+  locale: getLanguage(),
+  // https://kazupon.github.io/vue-i18n/zh/guide/fallback.html
+  fallbackLocale: 'en',
+  silentFallbackWarn: true,
+  silentTranslationWarn: true,
+  // set locale messages
+  messages
+})
+
+export default i18n