Nodejs的学习笔记（2）

一、node内置模块url

url:统一资源定位符 (详细内容请看官网https://nodejs.org/dist/latest-v12.x/docs/api/url.html)

1、url.parse和url.format() （类比json 记忆）

• url.parse 将url字符串转化成对象

  const url = require('url');
  let urlString = 'https:47.95.207.1:3000/fcj/recommend/hot/hehe?us=123&ps=567#nihao'
  let urlObj = url.parse(urlString)
  console.log(urlObj);
  //打印结果
  Url {
        
        
    protocol: 'https:',
    slashes: null,
    auth: null,
    host: null,
    port: null,
    hostname: null,
    hash: '#nihao',
    search: '?us=123&ps=567',
    query: 'us=123&ps=567',
    pathname: '47.95.207.1:3000/fcj/recommend/hot/hehe',
    path: '47.95.207.1:3000/fcj/recommend/hot/hehe?us=123&ps=567',
    href: 'https:47.95.207.1:3000/fcj/recommend/hot/hehe?us=123&ps=567#nihao'
  }
  

• url.format将url对象转字符串

  const url = require('url');
  var obj = {
        
        
    protocol: 'https:',
    slashes: null,
    auth: null,
    host: null,
    port: null,
    hostname: null,
    hash: '#nihao',
    search: '?us=123&ps=567',
    query: 'us=123&ps=567',
    pathname: '47.95.207.1:3000/fcj/recommend/hot/hehe',
    path: '47.95.207.1:3000/fcj/recommend/hot/hehe?us=123&ps=567',
    href: 'https:47.95.207.1:3000/fcj/recommend/hot/hehe?us=123&ps=567#nihao'
  }
  let str =url.format(obj);
  console.log(str);
  //打印结果
  'https:47.95.207.1:3000/fcj/recommend/hot/hehe?us=123&ps=567#nihao'
  

知识点补充 json: json是一种数据格式，json对象是保证json的格式的对象，json字符串是json格式的字符串。