Express框架基本使用

用法和Flask 很相似

文档：

英文：http://expressjs.com/

中文：https://www.expressjs.com.cn/

初始化项目

# 初始化 $ npm init # 安装 cnpm install express nodemon -S

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项目结构

server.js package.json node_modules/

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简单示例

server.js

const express = require("express"); const app = express(); app.get("/", (request, response) => { response.send("hello world!"); }) const port = process.env.PORT || 5000; app.listen(port, () => { console.log(`Server runing on http://127.0.0.1:${port}`); })

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运行

$ node server.js

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http://127.0.0.1:5000/

配置热重载

配置package.json

{ "name": "demo", "version": "1.0.0", "description": "", "main": "server.js", "scripts": { "start": "node server.js", "dev": "nodemon server.js" }, "author": "", "license": "ISC", "dependencies": { "express": "^4.17.1", "nodemon": "^2.0.2" } }

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热重载模式启动

$ npm run dev

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数据交互

接收参数，返回json

/** * body 默认是undefined，需要添加解析中间件 */ // for parsing application/json app.use(express.json()) // for parsing application/x-www-form-urlencoded app.use(express.urlencoded({ extended: true })) app.post("/json/:key", (request, response) =>{ const data = { body: request.body, params: request.params, query: request.query } response.json({ msg: 'success', code: 0, data: data}) } )

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请求测试

POST http://127.0.0.1:5000/json/value?name=Tom&age=23 Content-Type: application/json; charset=utf-8 { "school": "Tsinghua" } 反回数据 { "msg": "success", "code": 0, "data": { "body": { "school": "Tsinghua" }, "params": { "key": "value" }, "query": { "name": "Tom", "age": "23" } } }

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Express

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