使用vue-i18n让vue代码国际化

npm install vue-i18n --save

import VueI18n from 'vue-i18n'
Vue.use(VueI18n) ;
const i18n = new VueI18n({
 locale: 'zh-CN', // 语言标识, 通过切换locale的值来实现语言切换,this.$i18n.locale 
 messages: {
 'zh-CN': require('./common/lang/zh'), // 中文语言包
 'en-US': require('./common/lang/en') // 英文语言包
 }
})
new Vue({
 el: '#app',
 i18n, // 最后
 router,
 template: '<App/>',
 components: { App }
})

export const lang = {
 homeOverview:'首页概览',
 firmOverview:'公司概述',
 firmReports:'财务报表',
 firmAppendix:'更多附录',
 firmIndex:'主要财务指标',
 firmAnalysis:'对比分析',
 firmNews:'新闻事件档案',
 firmOther:'其他功能',
}

export const lang = {
 homeOverview:'Home overview',
 firmOverview:'firmOverview',
 firmReports:'firmReports',
 firmAppendix:'firmAppendix',
 firmIndex:'firmIndex',
 firmAnalysis:'firmAnalysis',
 firmNews:'firmNews',
 firmOther:'firmOther'
}

<p class="top_btn" @click="changeLangEvent">中文</p>

changeLangEvent() {
 console.log('changeLangEvent');
 this.$confirm('确定切换语言吗?', '提示', {
 confirmButtonText: '确定',
 cancelButtonText: '取消',
 type: 'warning'
 }).then(() => {
 if ( this.$i18n.locale === 'zh-CN' ) {
 this.$i18n.locale = 'en-US';//关键语句
 console.log('en-US')
 }else {
 this.$i18n.locale = 'zh-CN';//关键语句
 console.log('zh-CN')
 }
 }).catch(() => {
 console.log('catch');
 this.$message({
 type: 'info',
 });
 });
 }

<span v-text="$t('lang .homeOverview')"></span>
<span>{{$t('lang .homeOverview')}}</span>

<span class="el-dropdown-link">{{navCompany}}</span>
 computed:{
 navCompany:function(){
 if(this.nav_company){
 let str = 'lang'+this.nav_company;
 return this.$t(str);
 }
 }
},
 
 <el-submenu
 v-for="(value, title1, one) in navList"
 :key="one+1"
 :index="(one+1).toString()">
 <template slot="title">
 <router-link :to="linkList[title1]">{{ getTitle(title1) }}</router-link>
 </template>
 
</el-submenu>
methods: {
 getTitle(title){
 let str = 'lang.'+title;
 return this.$t(str);
 }
}