I worked on it all afternoon and reinstalled it many times. I found that there was no dev-server.js file in the build folder of vue-cli.

clipboard.png
compared with online tutorials, there are two fewer files and one more picture. And a small number of dev-server.js files happen to simulate the background data, how to change now, how to simulate the local data operation?

Vue-cli
Mar.04,2021

the answer is the same as the one on the first floor:
in the webpack.dev.conf.js file 

//
const express = require('express')
const app = express()
var appData = require('../data.json')
var seller = appData.seller
var goods = appData.goods
var ratings = appData.ratings
var apiRoutes = express.Router()
app.use('/api', apiRoutes)

//devServer,
before(app) {
  app.get('/api/seller', (req, res) => {
    res.json({
      // json
      errno: 0,
      data: seller
    })
  }),
  app.get('/api/goods', (req, res) => {
    res.json({
      // json
      errno: 0,
      data: goods
    })
  }),
  app.get('/api/ratings', (req, res) => {
    res.json({
      // json
      errno: 0,
      data: ratings
    })
  })
}

that's fine

edit in the webpack.dev.conf.js file.

add the following to the devServer option 

  manually build a single vue+node page (1)

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e9bdb6-1889.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e9bdb6-1889.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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