A brief discussion on how to build a local server using node.js

Using node.jsHow to set up a local server? The following article will introduce to you how to build a local server with node.js. I hope it will be helpful to you!

node.js is a back-end language based on JavaScript. Front-end friends can get started quickly and build a local server by themselves. Let’s take a look at how to do it~

[Recommended study: "nodejs Tutorial"]

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Note: This article You need to understand the add, delete, modify, and query commands of the MySQL database, and you need to manually create a new warehouse and data table

1. Node installation and simple use

1. Download

official website: node

• node official website download node.js and install it .

• After successful installation, open any terminal window, here use the cmd window (enter cmd after win r and press Enter)

• Enter node -v in the terminal window. If the node version number appears, the installation is successful

2. Simple use

Note: Use VSCode editor demonstration here, file name Can be customized, it is recommended to use an English name!

• Create a new code folder and open it with the code editor

• In the workspace, right-click and select Open

• in the integrated terminal and enter npm init -y to quickly execute npm Initialization

• After the initialization is completed, the file package.json will appear in the workspace, where the downloaded third-party modules

will be recorded.

• If you are new to npm, it is recommended to execute the following command and use Taobao mirror to download, which will speed up the download speed of third-party modules

  npm config set registry https://registry.npm.taobao.org

• Next, start executing the command to download the required third-party modules

  npm install express mysql

##After successful download (as shown in the picture below)

2. Code Demonstration

##1. Connect to the databaseThe code is as follows (example):

New

db.js

In order for the code structure to be clear and reusable, select a new file here to connect to the mysql database<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">    //导出    module.exports = (sql,callback) =&gt; {        const mysql = require('mysql')        const conn = mysql.createConnection({            host:'localhost',            // user、password需手动添加,与数据库保持一致            user:'',            password:'',            database:'数据库名'         })        // 建立连接         conn.connect()         conn.query(sql,callback)        // 断开连接         conn.end()     }复制代码</pre><div class="contentsignin">Copy after login</div></div>

2. Create a new local serviceThe code is as follows (example):

New

index.js

<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"> //首先加载express    const express = require('express')    const app = express()    //端口号    const port = 3000    //引入自定义的mysql文件    const db = require('./db.js')         //这里仅列举发送GET请求     app.get('url',(req,res) =&gt;{         db('select * from 表名', (err,result) =&gt; {            if(err) throw err             res.send(result)         })     })          app.listen(port,() =&gt; console.log('server is start,port is', port))复制代码</pre><div class="contentsignin">Copy after login</div></div>

3. Test local service

Code editor run

index.js

Use

ApiPost
• Software to test local services
##127.0.0.1

or

localhostAll are local addresses

Summary

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This article does not explain how to create a new database, if you need a demonstration , leave a message in the comment area and tell me~

For more programming-related knowledge, please visit:

Programming Video

! !

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