项目情况

element-plus 默认是英文模式，需要中文模式的话需要设置一下：

项目框架（vue3）：vite +JS + element-plus

版本：（注意版本兼容，element plus 较低版本：1.xx.xx，不一定适合此法

"element-plus": "^2.4.4",
"vue": "^3.0.4"

element Plus是按需导入，需要使用el-config-provider.

nullA Vue 3 based component library for designers and developershttps://element-plus.gitee.io/zh-CN/guide/i18n.html

在App.vue中使用el-config-provider改变语言效果

main.js

import { createApp } from 'vue'
import App from './App.vue'
import './index.css'
import ElementPlus from "../src/core/element";

import 'element-plus/theme-chalk/index.css'
import locale from 'element-plus/dist/locale/zh-cn.mjs'

const  app=createApp(App)
 app.use(ElementPlus)


const vm= app.mount('#app')
console.log(app)
console.log(vm)

 vite. config.js

pnpm run dev会警告按需引用，如要在main.js使用zh-cn.mjs,需要在项目根目录vite. config.js（如没有就创建一个），加下include路径加入。

module.exports = {
  lintOnSave: false,//关闭语法检查
  optimizeDeps: {
    include: ['element-plus/dist/locale/zh-cn.mjs'],
  }
}

APP.vue 

<template>

  <el-config-provider :locale="locale">


    <img alt="Vue logo" src="./assets/logo.png"/>
    <el-divider></el-divider>
    <div class="block">
      <span class="demonstration">中文日历：</span>
      <el-date-picker
          v-model="value1"
          type="date"
          placeholder="Pick a day"
      />
    </div>
    <el-divider></el-divider> 
    <br/>
  
  </el-config-provider>

</template>

<script> 
import locale from 'element-plus/dist/locale/zh-cn.mjs'
import {ElConfigProvider} from 'element-plus'

export default {
  name: 'App',
  components: {
    
    ElConfigProvider,
  },

  setup() {

   
  }
  ,
  data() {
    return {
      locale: locale,

      value1: '',
      name: '张三',
      job: {
        type: 'engine'
        , salary: 12000,
        address: {
          query: {name: 'gz'}
        }
      },
      hobby: ['排球', '羽毛球', '爬山']
    }
  }
  ,

  methods: {
    
  }
}
</script>