vue-i18n 国际化

插件基本思路

1. 定义语言包：需要几种语言展示，就定义几个语言包。
2. 组合语言包对象：创建对象，对语言包进行组合，对象的 key 为语言包引用，值为语言包对象。
3. 创建实例：创建 vue-i18n 类的对象，添加 message 和 locale 属性。
4. 挂载：挂载创建的实例对象。

安装插件 vue-i18n

使用 npm

npm install vue-i18n@9.13.1

使用 yarn

yarn add vue-i18n@9.13.1

定义和组合语言包

先定义常用的两个语言包：

// src/i18n/lang/en.js
// 定义英文语言包对象
export default {
  test:{
     na: "姓名",
     zy: "专业",
     dz: "地址",
     zx: "哲学",
     zs: "张三",
     bj: "北京",
     jjx: "经济学",
     ls: "李四",
     sh: "上海",
     jr: "金融",
     dd: "东东",
     hd: "邯郸",
     jy: "教育",
     xm: "小明",
     tj: "天津",
     name:'请输入。。。。',
     nameInfo:'长度在3-5',
     selet:"请选择"
  }
};

// src/i18n/lang/zh.js
// 定义英文语言包对象
export default {
  test:{
    na: "full name",
    zy: "major",
    dz: "address",
    zx: "Philosophy",
    zs: "Zhang San",
    bj: "Beijing",
    jjx: "economics",
    ls: "Li Si",
    sh: "Shanghai",
    jr: "finance",
    dd: "Dongdong",
    hd: "Handan",
    jy: "education",
    xm: "Xiaoming",
    tj: "Tianjin",
    qsr:'Please input Activity name',
    nameInfo:'Length should be 3 to 5',
    selet:"Please select Activity zone"
  }
};

引入插件并创建 i18n 实例

组合语言包

// src/i18n/index.js
import { createI18n } from 'vue-i18n'
// 语言包
import selfEn from './lang/en'
import selfZh from './lang/zh'
const messages = {
  en: {
      ...selfEn,
  },
  zh: {
    ...selfZh,
  }
}

const locale = 'zh'
const i18n = createI18n({
  locale,
  messages, // set locale messages
  legacy:false,
  globalInjection: true ,// 全局注册$t方法
})

export default i18n

挂载实例对象

// main.js
import { createApp } from "vue";
import i18n from "i18n";
const app = createApp(App);
app.use(i18n);

在组件中使用

<template>
  <div style="margin: 20px auto; width: 1000px">
    <el-table :data="tableData" style="width: 100%">
      <el-table-column prop="name" :label="$t('test.na')" width="180" />
      <el-table-column prop="major" :label="$t('test.zy')" width="180" />
      <el-table-column prop="address" :label="$t('test.dz')" />
    </el-table>
    <el-form
    ref="ruleFormRef"
    style="max-width: 600px"
    :model="ruleForm"
    :rules="rules"
    label-width="auto"
    status-icon
  >
    <el-form-item label="Activity name" prop="name">
      <el-input v-model="ruleForm.name" />
    </el-form-item>
    <el-form-item label="Activity zone" prop="region">
      <el-select v-model="ruleForm.region" placeholder="Activity zone">
        <el-option label="Zone one" value="shanghai" />
        <el-option label="Zone two" value="beijing" />
      </el-select>
    </el-form-item>
  </el-form>
  </div>
</template>

<script setup>
import  { useI18n } from "vue-i18n";
import { computed, reactive, ref } from 'vue'

const {t:$t} =  useI18n()
const currentPage4 = ref(4)
const pageSize4 = ref(100)

const ruleFormRef = ref()
const ruleForm = reactive({
  name: '',
  region: '',
})

const rules = computed(()=>({
  name: [
     { required: true, message: $t('test.qsr'), trigger: 'blur' },
    { min: 3, max: 5, message: $t('test.nameInfo'), trigger: 'blur' },
  ],
  region: [
    {
      required: true,
      message: $t('test.selet'),
      trigger: 'change',
    },
  ],
}))

const tableData = computed(()=>[
  {
    major: $t('test.zx'),
    name: $t('test.zs'),
    address: $t('test.bj'),
  },
  {
    major:$t('test.jjx'),
    name: $t('test.ls'),
    address:$t('test.sh'),
  },
  {
    major: $t('test.jr'),
    name: $t('test.dd'),
    address: $t('test.hd'),
  },
  {
    major: $t('test.jy'),
    name: $t('test.xm'),
    address: $t('test.tj'),
  },
])

</script>

动态切换语言：

添加按钮切换语言时，Vue2 和 Vue3 的修改方式是不同的，

在 Vue2 中使用全局的 this.$i18n.locale 就可以修改，

但在 Vue3 中，需要 Hook 进行修改，如下所示：切换当前语言环境

import  { useI18n } from "vue-i18n";
const {locale} = useI18n()
const changeLang = (currentLang) => {
...
locale.value = currentLang; // 切换当前语言环境
...
}

在vsCode中使用国际化后为了使代码看起来更容易，可以下载扩展插件 i18n Ally

在settings.json 里进行配置

{
  // #region i18n-ally 配置 start 
  "i18n-ally.localesPaths": [
    "src/i18n/lang"
  ],
  "i18n-ally.editor.preferEditor": true,
  "i18n-ally.sourceLanguage": "en",
  "i18n-ally.displayLanguage": "zh",
  "i18n-ally.enabledParsers": ["js"],
  "i18n-ally.pathMatcher": "{locale}.js",
  // "i18n-ally.preferredDelimiter": "_",
  "i18n-ally.enabledFrameworks": [
    "vscode",
    "vue",
    "general"
  ],
  "i18n-ally.keystyle": "nested",
  "cSpell.words": [
    "Exts",
    "Unflatten",
    "enablement",
    "exts",
    "inplace",
    "inplaces",
    "joomla",
    "lokalise",
    "regs",
    "youdao"
  ]
  // #endregion i18n-ally 配置 end
}

配置完成后如下图