September 2022
Intermediate to advanced
585 pages
8h 17m
Chinese
Content preview from JavaScript 经典实例：第三版
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528
第
21
章
使用
Express
构建
Web
应用
Express
（
https://expressjs.com
）是一个轻量级
Web
框架，在
Node Web
应用开发
领域长期处于领先地位。与
Ruby
的
Sinatra
和
Python
的
Flask
类似，
Express
扩建
本身非常小巧，但是经过扩展之后可用于构建任何类型的
Web
应用。
Express
还
是
Keystone.js
（
https://keystonejs.com
）、
Sails
（
https://sailsjs.com
）和
Vulcan.js
（
http://vulcanjs.org
）等
Web
应用框架的主干。使用
Node
开发
Web
应用，很难脱
离
Express
。本章着重介绍
Express
的一些基本用法，你可以在此基础上扩展，构建
各种各样的
Web
应用。
21.1
使用
Express
响应请求
21.1.1
问题
你的
Node
应用需要响应
HTTP
请求。
21.1.2
方案
安装
Express
包。
$ npm install express
在一个名为
index.js
的文件中引入并调用该模块，指定连接端口，设置
Express
。
使用
Express
构建
Web
应用
｜
529
const
express = require('express');
const
app = express(); ...
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