parse方法

parse方法将url解析为对象，第一个参数是要解析成对象的url字符串，第二个是是否查询参数，为true，查询参数解析为对象，第三个是是否以//解析主机

const path = require("path");
const url=require("url");

let str="/images/fff/123/jj.jpg";
console.log(path.parse(str));
结果：
{
  root: '/',
  dir: '/images/fff/123',
  base: 'jj.jpg',
  ext: '.jpg',
  name: 'jj'
}


console.log(path.sep);// \
let u = "//www.baidu.com:8080/images/fff/123/jj.jpg?id=1&name=tom#hash";
console.log(url.parse(u));//query

结果：
\
Url {
  protocol: null,
  slashes: null,
  auth: null,
  host: null,
  port: null,
  hostname: null,
  hash: '#hash',
  search: '?id=1&name=tom',
  query: 'id=1&name=tom',
  pathname: '//www.baidu.com:8080/images/fff/123/jj.jpg',//pathname 属性是一个可读可写的字符串，可设置或返回当前 URL 的路径部分
  path: '//www.baidu.com:8080/images/fff/123/jj.jpg?id=1&name=tom',
  href: '//www.baidu.com:8080/images/fff/123/jj.jpg?id=1&name=tom#hash'
}
console.log(url.parse(u,true));

Url {
  protocol: null,
  slashes: null,
  auth: null,
  host: null,
  port: null,
  hostname: null,
  hash: '#hash',
  search: '?id=1&name=tom',
  query: [Object: null prototype] { id: '1', name: 'tom' },//第二个参数为true，query属性就会从查询字符串格式（“a=1&b=2”）转换为了对象格式（{a: 1,b: 2}）
  pathname: '//www.baidu.com:8080/images/fff/123/jj.jpg',
  path: '//www.baidu.com:8080/images/fff/123/jj.jpg?id=1&name=tom',
  href: '//www.baidu.com:8080/images/fff/123/jj.jpg?id=1&name=tom#hash'
}
console.log(url.parse(u,  true, true));
Url {
  protocol: null,
  slashes: true,
  auth: null,
  host: 'www.baidu.com:8080',//host
  port: '8080',
  hostname: 'www.baidu.com',
  hash: '#hash',
  search: '?id=1&name=tom',
  query: [Object: null prototype] { id: '1', name: 'tom' },
  pathname: '/images/fff/123/jj.jpg',
  path: '/images/fff/123/jj.jpg?id=1&name=tom',
  href: '//www.baidu.com:8080/images/fff/123/jj.jpg?id=1&name=tom#hash'
}