1. 檔案上傳：

const express = require('express')
const multer = require("multer");
const router = express.Router()

const storage = multer.diskStorage({
  // 設定儲存檔案的路徑
  destination: function (req, file, cd) {
    cd(null, './public/images')
  },
  // 設定圖片名稱
  filename: function (req, file, cd) {
    cd(null
 
, `${Date.now()}-${file.originalname}`)
  }
})
const upload = multer({
  storage: storage
})

router.post('/file', upload.single('file'), (req, res, next) => {
  let url = `/api/public/images/${req.file.filename}`
  if (!req.file) {
    return res.json({
      code: 1,
      message: '上傳失敗'
    })
  } 
 
else {
    return res.json({
      code: 200,
      message: '上傳成功',
      url: url
    })
  }
})

module.exports = router

2. 反顯

const express = require('express');
const getImage = express();
const path = require('path')
getImage.get('/public/images/*', (req, res) => {
  res.sendFile(path.resolve(__dirname, 
 
'..') + "/" + req.url);
  // res.send()
})

module.exports = getImage