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Nodejs教程之Expressjs一篇文章快速入门
2022-07-06 12:51:00 【知识大胖】
什么是Expressjs
Express 是用于服务器端 Web 应用程序的 Node.js 框架。Express 基于 Node.js 功能构建,可提供简单快速的 Web 和移动服务器解决方案。它是开源框架,由 Node.js 社区维护。在 Express 上构建了许多其他库,许多大型科技公司正在其后端服务中使用 Express。
项目环境建设
假设您已经安装了Node.js,创建一个目录来保存您的应用程序,并将其设为您的工作目录。
mkdir myapp
cd myapp
使用该npm init命令为您的应用程序创建一个package.json文件。有关如何package.json工作的
npm init
现在在目录中安装 Express并将其保存在依赖项列表中。例如:
npm install express
项目源码
const express = require('express')
const app = express()
const port = 3000
app.get('/', (req, res) => {
res.send('Hello World!')
})
app.listen(port, () => {
console.log(`Example app listening on port ${port}`)
})
项目运行
以下命令运行应用程序:
node index.js
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