node.js

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node -v

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npm init -y

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npm i axios -S 

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const axios = require("axios")

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axios.get(url)
.then(res=>{})

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module.exports = {
	max(){},
	randomStr(){}
}

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const utils = require('./utils.js')
//
const {max,randomStr} = require('./utils.js')

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utils.max()
utils.randomStr()
// 
max()
randomStr()

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npm i mysql -S

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const mysql = require("mysql")

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const conn = mysql.createConnect({
	host:"localhost",
	user:"root",
	password:"mysql",
	database:"feed"
})

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conn.connect(function(err){
	if(!err){
		console.log("数据库连接成功")
	}
})

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var sql = "select * from feedback where 1"

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conn.query(sql,function(err,res){
	if(!err){
		console.log(res)
	}
})

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conn.end(function(){
	console.log("数据库已断开")
})

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const http = require("http")

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const server = http.createServer(function(req,res){
// req请求的数据  res 响应的数据
res.statusCode = 200;
res.setHeader("Content-Type","application/json")
res.end(`{}`)

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server.listen(8888,function(){
	console.log("localhost:8888 启动")
})