1.新建项目文件并且创建入口文件server.js
2.初始化
npm init
3.安装express
npm install express
4.在入口文件(server.js)中写
const express = require('express')
const app = express()
app.get("/",(req,res) => {
res.send("Hello world!");
})
const port = process.env.PORT || 5000 //端口
app.listen(port,() => {
console.log('Server runing on port $(port)')
})
5.运行node
node server.js
6.当你每次更改代码时都需要重新运行node server.js这时就不方便,你可以安装 nodemon
npm install nodemon -g 运行 nodemon server.js 实现自动更新 (之前我们用node server.js)
7.修改package配置
{
"name": "app",
"version": "1.0.0",
"description": "restful api",
"main": "server.js",
"scripts": {
"start":"node server.js",
"server":"nodemon server.js"
},
"author": "Baibu",
"license": "ISC",
"dependencies": {
"express": "^4.17.1"
}
}