NodeJS提取网址参数

querystringify模块

querystring，将url请求地址后的参数转化为对象，也可以把对象转化为url后的参数，便利对url的操作，npm install querystring -D，“querystring”已弃用。

代码案例

const querystring = require("querystring");
let url = "/get?id=123456&name=%E5%BC%A0%E4%B8%89";
console.log("uri", url.split('?')[0]);
let param = url.split('?')[1];
let obj = querystring.parse(param);
console.log("obj", obj);
console.log("obj.id=", obj.id, "obj.name=", obj.name);

let obj2 = {
  id: 345678,
  name: "张三",
  hobby: ["play", "com1", "com2"]
};
var o2s = querystring.stringify(obj2);
console.log("o2s", o2s);

querystringify模块

querystringify模块，qs.parse()和qs.stringify()，npm install querystringify --save，地址：https://github.com/unshiftio/querystringify。

代码案例

const qs = require('querystringify');

let r11 = qs.parse('?foo=bar');
console.log(r11); // { foo: 'bar' }
let r12 = qs.parse('#foo=bar');
console.log(r12); // { foo: 'bar' }
let r13 = qs.parse('foo=bar');
console.log(r13); // { foo: 'bar' }
let r14 = qs.parse('foo=bar&bar=foo');
console.log(r14); // { foo: 'bar', bar: 'foo' }
let r15 = qs.parse('foo&bar=foo');
console.log(r15); // { foo: '', bar: 'foo' }

let r21 = qs.stringify({ foo: 'bar' });
console.log(r21); // foo=bar
let r22 = qs.stringify({ foo: 'bar' }, true);
console.log(r22); // ?foo=bar
let r23 = qs.stringify({ foo: 'bar' }, '#');
console.log(r23); // #foo=bar
let r24 = qs.stringify({ foo: '' }, '&');
console.log(r24);  // &foo=

url模块

将url解析成对象，parse方法原型：url.parse(urlStr[, parseQueryString][, slashesDenoteHost])，可传递3个参数，1、urlStr：要解析成对象的url字符串；2、parseQueryString：是否解析查询参数，默认为false；3、slashesDenoteHost：是否以斜线解析主机名，默认为false。

代码案例

const url = require('url')

let urlParam = new URL("/foo?name=%E5%BC%A0%E4%B8%89", "http://localhost:3000");
console.log("urlParam =", urlParam);
console.log("name =", urlParam.searchParams.get("name"))

接收请求参数

接收参数，代码案例

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

// 创建Server
const httpServer = http.createServer((req, res) => {
  const method = req.method;
  const uri = req.url.split('?')[0];
  console.log("uri", uri);
  if (uri == '/get1') {
    // Get请求
    let data = url.parse(req.url, true).query;
    res.setHeader('Content-Type', 'html/text;charset=utf-8');
    console.log("get1 data", data);
    // get1 data [Object: null prototype] { id: '123456', name: '张三' }
    res.end("data.id=" + data.id + ",data.name=" + data.name);
  } else if (uri == '/post1') {
    // POST请求
    let data = url.parse(req.url, true).query;
    res.setHeader('Content-Type', 'html/text;charset=utf-8');
    console.log("post1 data", data);
    // post1 data [Object: null prototype] { id: '123456', name: '李四' }
    res.end("data.id=" + data.id + ",data.name=" + data.name);
  } else if (uri == '/post2') {
    // POST请求（JSON）
    let postData = "";
    // 数据块接收中
    req.on("data", function (postDataChunk) {
      postData += postDataChunk;
    });
    // 接收完毕
    req.on("end", function () {
      let jsonObject = JSON.parse(postData);
      console.log("postData=", postData);
      res.setHeader('Content-Type', 'html/text;charset=utf-8');
      console.log("jsonObject.id=", jsonObject.id);
      console.log("jsonObject.name=", jsonObject.name);
      res.end("jsonObject.id=" + jsonObject.id + ",jsonObject.name=" + jsonObject.name);
    });
  }
});

httpServer.listen(3000, function () {
  console.log("http server port:", 3000);
});

模拟实现路由，代码案例

server.js

const http = require("http");
var url = require("url");
var router = require("./module/router.js");

// 创建Server
const httpServer = http.createServer((request, response) => {
  if (request.url !== '/favicon.ico') {
    let pathname = url.parse(request.url).pathname;
    console.log("pathname.", pathname);
    pathname = pathname.replace(/\//, '');
    console.log("pathname..", pathname);
    router[pathname](request, response);
  }
});

// 监听
httpServer.listen(3000, function () {
  console.log("http server port:", 3000);
});

module\router.js

module.exports = {
  // http://127.0.0.1:3000/demo1
  demo1: function (req, res) {
    res.end("demo1");
  },
  // http://127.0.0.1:3000/demo2
  demo2: function (req, res) {
    res.end("demo2");
  }
}