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-pickerv-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>