feat(lang/index.ts): 添加和创建i18n实例

src/lang/index.ts

+import {createI18n} from 'vue-i18n'
+import {localStorage} from '@/utils/storage'
+
+// Element Plus 国际化配置
+import elementPlusLocaleZhCn from 'element-plus/es/locale/lang/zh-cn'
+import elementPlusLocaleEn from 'element-plus/es/locale/lang/en'
+
+// 自定义国际化配置
+import enLocale from './en'
+import zhCnLocale from './zh-cn'
+import {Locale, Path} from "@intlify/core-base";
+
+const messages = {
+    'zh-cn': {
+        ...zhCnLocale,
+        ...elementPlusLocaleZhCn
+    },
+    en: {
+        ...enLocale,
+        ...elementPlusLocaleEn
+    }
+}
+
+export const getLanguage = () => {
+    let language = localStorage.get('language')
+    if (language) {
+        return language
+    }
+    language = navigator.language.toLowerCase() // 浏览器使用的语言
+    const locales = Object.keys(messages)
+    for (const locale of locales) {
+        if (language.indexOf(locale) > -1) {
+            return locale
+        }
+    }
+    return 'zh-cn'
+}
+
+const i18n = createI18n({
+    locale: getLanguage(),
+    messages: messages
+})
+
+export default i18n
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