vue3.0 + ts + element-plus + i18n 中英文切换

npm install vue-i18n@next 

import { createApp } from ‘vue‘;
import App from ‘./App.vue‘;
import router from ‘./router‘;
import store from ‘./store‘;
import ElementPlus from ‘element-plus‘;
import ‘element-plus/lib/theme-chalk/index.css‘;
import ZhLocale from ‘element-plus/lib/locale/lang/zh-cn‘; // 中文
import EhLocale from ‘element-plus/lib/locale/lang/en‘; // 英文
import I18n from "@/lang/index"; //引入i18n组件


let locale = ‘‘;
//控制 element-plus 组件语言
if(I18n.global.fallbackLocale == ‘zh‘) {
    locale = ZhLocale as unknown as string;
} else {
    locale = EhLocale as unknown as string;
}

createApp(App).use(store).use(router).use(ElementPlus, { locale }).use(I18n).mount(‘#app‘);

import { createI18n } from ‘vue-i18n‘
const i18n = createI18n({
    locale: localStorage.getItem(‘lang‘) || ‘zh‘,        //默认显示的语言 
    messages: {
        zh: require(‘./zh.js‘),    //引入语言文件
        en: require(‘./en.js‘)
    }
})
export default i18n;

module.exports = {
    header_menu: {
        login:‘登录‘,
        register:‘注册‘,
        logout:‘退出登录‘,
    }
}

module.exports = {
    header_menu: {
        login: ‘Login‘,
        register: ‘Register‘,
        logout: ‘Log out‘,
    }
}

<el-dropdown trigger="click" @command="handleSetLanguage" class="languages">
　　<div style="font-size: 15px;">
　　　　<span>{{langName}}</span>
　　　　<i class="el-icon-arrow-down el-icon--right"/>
　　</div>
　　<template #dropdown>
　　　　<el-dropdown-menu>
　　　　　　<el-dropdown-item :disabled="language===‘zh‘" command="zh">中文</el-dropdown-item>
　　　　　　<el-dropdown-item :disabled="language===‘en‘" command="en">English</el-dropdown-item>
　　　　</el-dropdown-menu>
　　</template>
</el-dropdown>

//  setup：
const langName = ref(‘‘);
const language = ref(‘‘);

// 切换事件：
const handleSetLanguage = (lang: string) => {
　　if(lang === ‘zh‘) {
　　　　langName.value = ‘中文‘;
　　} else {
　　　　langName.value = ‘English‘;
　　}
　　language.value = lang;
　　localStorage.setItem(‘lang‘, lang);
　　ElMessage.success(‘语言切换成功‘);
　　location.reload();
};

//页面加载判断语言
onMounted(()=>{