Node.js学习02--创建express服务

1.创建npm文件

npm init -y

 

2.安装express依赖

npm i express

 

3.编写js代码

const express = require('express')

const router = express.Router()

router.get('/msg',(req,res)=>{
    res.send('hello wolrd')
})

let app = express()

app.use(router)

app.listen(8080,()=>{
    console.log('listen on port 8080')
})

 

package.json的内容如下：

{
  "name": "express_test",
  "version": "1.0.0",
  "description": "",
  "main": "app.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "express": "^4.17.1"
  }
}

 

4.启动express服务

node app.js

 

5.测试效果

http://localhost:8080/msg