NodeJS

Posted 2021-11-23 sonwrain

安装

https://nodejs.org/en/download/

自动启动工具

安装

npm install -g supervisor

启动

supervisor app.js

http模块

const http = require(‘http‘)

http.createServer((req, res) => {
  res.writeHead(200,{‘Content-Type‘:‘text/html;charset=utf-8‘})
  res.end(‘Hello World!‘)
}).listen(3000)

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我们可以看出NodeJS不及是一个应用还是一个HTTP服务器

url模块

url.parse()

url.parse(‘http://localhost:3000‘)
Url {
  protocol: ‘http:‘,
  slashes: true,
  auth: null,
  host: ‘localhost:3000‘,
  port: ‘3000‘,
  hostname: ‘localhost‘,
  hash: null,
  search: null,
  query: null,
  pathname: ‘/‘,
  path: ‘/‘,
  href: ‘http://localhost:3000/‘ }
> url.parse(‘http://localhost:3000?name=Susan&age=18‘)
Url {
  protocol: ‘http:‘,
  slashes: true,
  auth: null,
  host: ‘localhost:3000‘,
  port: ‘3000‘,
  hostname: ‘localhost‘,
  hash: null,
  search: ‘?name=Susan&age=18‘,
  query: ‘name=Susan&age=18‘,
  pathname: ‘/‘,
  path: ‘/?name=Susan&age=18‘,
  href: ‘http://localhost:3000/?name=Susan&age=18‘ }
> url.parse(‘http://localhost:3000?name=Susan&age=18‘, true)
Url {
  protocol: ‘http:‘,
  slashes: true,
  auth: null,
  host: ‘localhost:3000‘,
  port: ‘3000‘,
  hostname: ‘localhost‘,
  hash: null,
  search: ‘?name=Susan&age=18‘,
  query: [Object: null prototype] { name: ‘Susan‘, age: ‘18‘ },
  pathname: ‘/‘,
  path: ‘/?name=Susan&age=18‘,
  href: ‘http://localhost:3000/?name=Susan&age=18‘ }

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代码

const query = url.parse(req.url, true).query  // 设置为true，get传值转换为对象，如果不设置true，那么是字符串

url.resolve()

> url.resolve(‘http://localhost:3000‘, ‘index‘)
‘http://localhost:3000/index‘
> url.resolve(‘http://localhost:3000/home‘, ‘index‘)

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