1.初始化我的项目
npm init -y

2.应用Express框架创立服务器，用mongoose连贯数据库，cors解决跨域
npm i express mongoose cors

3.新建一个文件夹http_serve，目录构造

3.1 index.js文件，启动node服务

const express = require('express')const cors = require('cors')const app = express()//解决跨域app.use(cors())//express内置了post参数解析app.use(express.urlencoded({ extended: false }))const apiRouter = require('./router')app.use(apiRouter)app.listen(3008, function () {  console.log('app is runing at port 3008');})

3.2 db.js 连贯mongoDB

const mongoose = require('mongoose')const IP = 'localhost'const PORT = 27017const DB_NAME = 'org'//连贯mongoose.connect(`mongodb://${IP}:${PORT}/${DB_NAME}`, {  useNewUrlParser: true})//连贯胜利mongoose.connection.on('connected', () => {  console.log('Mongoose connection success')})//连贯异样mongoose.connection.on('error', (err) => {  console.log('Mongoose connection error:' + err)})//连贯胜利mongoose.connection.on('disconnected', () => {  console.log('Mongoose connection disconnected')})module.exports = mongoose

3.3 router.js 定义接口以及办法

const express = require('express')const router = express.Router()const dataList = require('../serve_schema/dataList')let result = {  code: 200,  msg: 'ok'}//创立数据router.post('/postData', async (req, res) => {  let postData = new dataList({ ...req.body })  await postData.save(err => {    if (err) {      throw err    } else {      res.json({ ...result })    }  })})//获取数据router.get('/getList', async (req, res) => {  let { start, limit } = req.query  if (start == undefined) {    start = 0;  }  if (limit == undefined) {    limit = 10;  }  let data = await dataList.find().skip(Number(start)).limit(Number(limit));  res.json({ ...result, data })})module.exports = router

3.4 serve_scheam文件夹下的dataList.js，创立数据库模型，也就是创立一个数据库的表，用来存数据，设置数据的一些字段等。

const mongoose = require('../serve_setting/db')const { Schema } = mongooseconst userSchema = new Schema({  username: { type: String },  password: { type: String },  email: { type: String },  mobile: { type: String },  status: { type: Number, default: 1 },}, { versionKey: false })// versionKey 不显示版本字段module.exports = mongoose.model('User', userSchema, 'user')//第三个参数，指定汇合名，不主动匹配对应的复数模式users。

4.全局装置一个主动重启的node工具nodemon
npm install -g nodemon

5.配置启动文件，pageage.json

  "scripts": {        "start": "nodemon http_serve/serve_setting/index.js"  },

通过npm run start启动

通过postman验证一下

至此，咱们的后盾接口就定义实现了。