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一、下载依赖：

npm install vue-i18n@nex

二、创建ts文件并配置main.ts

在 src 目录下新建 lang 文件夹，再创建3个ts文件，lang / index.ts , lang / en.ts , lang / zh.ts

index.ts

// index.ts
import { createI18n } from 'vue-i18n'
import zh from './zh'
import en from './en'const messages = {en,zh,
}console.log('localStorage.getItem', localStorage.getItem('language'));const language = (navigator.language || 'en').toLocaleLowerCase() // 获取浏览器的语言
console.log('language.split', language.split('-')[0]);const i18n = createI18n({locale: localStorage.getItem('language') || language.split('-')[0] || 'en', // 先从缓存里拿，没有的话就用浏览器语言，fallbackLocale: 'zh', // 设置备用语言messages,legacy: false,globalInjection:true,
})export default i18n

en.ts

export default {login: {login: 'login',userName: 'userName',password: 'password',},captcha: 'Captcha',forgetPassword: 'Forget Password?',loginTip: 'The login result is random. Just fill in the captcha',editpassword: 'Edit Password',logout: 'Logout',errMsg: {inputRequired: 'Please Input {cont}',selectRequired: 'Please Select {cont}',},
}

zh.ts

export default {login: {login: '登录',userName: '用户名',password: '密码',},captcha: '验证码',forgetPassword: '忘记密码了？',loginTip: '当前登录结果随机。验证码随便填',editpassword: '修改密码',logout: '退出登录',errMsg: {inputRequired: '请输入{cont}',selectRequired: '请选择{cont}',},
}

main.ts

import i18n from './lang/index'
app.use(i18n)

三，如何使用

1.在中使用

 <div>{{ $t('login.userName') }}</div><div v-t="'login.password'"></div>

2.在setup中使用

<script setup lang="ts">
import { useI18n } from 'vue-i18n'const { t } = useI18n()console.log(t('login.useName'))
</script>

四、全局下拉框动态切换

这边我是在stores下创建了一个langConversion.ts文件。src\stores\modules\langConversion.ts
langConversion.ts

export enum LangOption {EN = 'en',ZH = 'zh'}// 语言可选项
export const langOptions = [{ label: "English", value: LangOption.EN},{ label: "中文", value: LangOption.ZH},]export async function  langConversionEvent(lang:string){// let langs = localStorage.getItem('language') === 'en'?'zh':'en'localStorage.setItem("language", lang);window.location.reload();
}

需要调用该方法的vue页面，这里用的NaiveUI组件

<n-select size="small"  style="width: 120px;" v-model:value="optionsValue" :options="options"   @update:value="handleUpdateValue"/><script lang="ts">
import { langConversionEvent, langOptions } from "@/stores/modules/langConversion"export default defineComponent({setup(){const  optionsValue = ref(localStorage.getItem('language') || language.split('-')[0])return{optionsValue,options:langOptions,handleUpdateValue (value: string) {langConversionEvent(value)},}}
})<script>

官网：I18n