npm install --save nodemailer 

// routes
var contact = require('./routes/contact');
app.use('/contact', contact);

var express = require('express');
var router = express.Router();
var nodemailer = require('nodemailer');

//環境變數
require('dotenv').config()
router.get('/', (req, res)=> {
    res.render('contact');
});
//這是寄送的成功訊息
router.get('/review', (req, res)=> {
    res.render('contactReview');
});

//這是寄送的表單
router.post('/post', (req, res) =>
{
    const transporter = nodemailer.createTransport({
    host: 'smtp.gmail.com',
    port: 465,
    secure: true,
    auth: {
        type: "OAuth2",
        user: process.env.ACCOUNT,
        clientId: process.env.GMAIL_CLINENT_ID,
        clientSecret: process.env.GMAIL_CLINENT_SECRET,
        refreshToken: process.env.GMAIL_CLINENT_REFRESHTOKEN,
        accessToken: process.env.GMAIL_CLINENT_ACCESSTOKEN,
    }
    });
   let mail = req.body.email;
    var mailOptions = {
        form: '"我自己"<xxx@gmail.com>',
        to :`xxx@gmail.com,${mail}`,
        subject:req.body.title+':'+req.body.username +'的訂單',
        text: req.body.description
    }
    transporter.sendMail(mailOptions, (error, info) =>
    {
        console.log('info',info);
        if(error){
            return console.log(error,'訂單沒有送出!');
        }
        res.redirect('review');
    })
});
module.exports = router;

<meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />
<meta http-equiv="Pragma" content="no-cache" />
<meta http-equiv="Expires" content="0" />

npm i rollup-plugin-visualizer -D

//引入
import { visualizer } from "rollup-plugin-visualizer";

module.exports = {
    plugins: [
    vue(), 
    visualizer()
    ],
};

npm i vite-plugin-compression -D

//引入vite-plugin-compression
import viteCompression from 'vite-plugin-compression'
module.exports = {
    plugins: [
    vue(), 
    viteCompression()
    ],
};

安裝
npm i vite-plugin-imagemin -D

//引入
import viteImagemin from 'vite-plugin-imagemin'

export default defineConfig({
    plugins: [
        vue(),
        visualizer(),//構建（打包）分析插件
        viteCompression(), //GZIP 配置
        viteImagemin(), // 圖片壓縮
    ],
})

function addFn() {
      let num = 10

      function ClosureAddFn(newNum) {
        num = num + newNum
        return num
      }
      //函示內 return 函示就會變成 『閉包』
      return ClosureAddFn
    }
const useClosure = addFn()

console.log(useClosure(10)) //20
console.log(useClosure(10)) //30
console.log(useClosure(10)) //40

function addFn() {
      let num = 10

      function ClosureAddFn(newNum) {
        num = num + newNum
        return num
      }
      //函示內 return 函示就會變成 『閉包』
      return ClosureAddFn
    }
const useClosure = addFn()
console.log(useClosure(10)) //20
console.log(useClosure(10)) //30
console.log(useClosure(10)) //40

const useClosure2 = addFn()
console.log(useClosure2(100)) //110
console.log(useClosure2(100)) //210

function closuretest(){
    x=10;
    function changex(cx){
        x=cx;
    }
    function showx(){
        console.log(x)
    }
    f1= changex;
    f2= showx;
}
closuretest();
console.log(f2())//顯示10
console.log(f1(5))
console.log(f2())//顯示5

function closuretest(ox){
    var x=ox;
    return function(){
        console.log(x)
    }
}
var f1=closuretest(5);
var f2=closuretest(10);
console.log(f1());//顯示5
console.log(f2());//顯示10

function MyPlayer(name,race,sex) {
  this.name = name.toString();
  this.race = race.toString();
  this.sex = sex.toString();
  this.getName = function() {
    return this.name;
  };
  this.getRace = function() {
    return this.race;
  };
  this.getSex = function() {
    return this.sex;
  };
}

function MyPlayer(name,race,sex) {
  this.name = name.toString();
  this.race = race.toString();
  this.sex = sex.toString();
}
MyPlayer.prototype.getName = function() {
  return this.name;
};
MyPlayer.prototype.getRace = function() {
  return this.race;
};
MyPlayer.prototype.getSex = function() {
  return this.sex;
};

let text = "ABCDEFG"
const myArr = Array.from(text);
console.log(myArr)
//(7) ['A', 'B', 'C', 'D', 'E', 'F', 'G']

const fruits = ["Banana", "Orange", "Apple", "Mango"];
let result = Array.isArray(fruits);
console.log(result)
//true

let fruits = Array.of("Banana", "Orange", "Apple", "Mango");
console.log(fruits)
//(4) ['Banana', 'Orange', 'Apple', 'Mango']

const fruits = ["Banana", "Orange", "Apple", "Mango"];

// 建立條目
const list = fruits.entries();

// 列出條目
let text = "";
for (let x of list) {
  console.log(x)
}
//(2) [0, 'Banana']
//(2) [1, 'Orange']
//(2) [2, 'Apple']
//(2) [3, 'Mango']