node.js处理url常用方法

处理非阻塞I/O/**回调函数的方法 异步*//*function f(cb){ fs.readFile(‘./4‘,(err,data)=>{ ????cb(data.toString()); //回调})}f(function(data){ ?console.log(data);});*/function f(){ ?fs.readFile(‘./4‘,(err,data)=>{ ???myEvent.emit(‘talk‘,data.toString());//事件进行绑定})}//执行 ----发布者f();myEvent.on(‘talk‘,(data)=>{ ?console.log(data); //data == data.toString()})三URL模块 和queryString模块;var queryString = require(‘quirestring‘);//查询字符串， //queryString.parse(string)将字符串解析成对象；let str = ‘name:idhorse?age:18?gender:male‘;let obj = queryString.parse(str,‘?‘,‘:‘)//默认情况下 第二个参数是&，第三个是=//解析结果 {name:‘idhorse‘,age:‘18‘,gender:‘male‘};//queryString.stringify()将一个对象解析成一个字符串let str2 = queryString.stringify(obj,‘&‘,‘=‘);//‘name=idhorse&age=18&gender=male‘let a = encodeURIComponent(str)//进行编码加密处理let b = decodeURIComponent(a);//进行解码处理解析url var http = require(‘http‘), ???urlApi = require(‘url‘), ???server;server = http.createSever((request,response)=>{ ???response.writeHead(200,{‘Content-type‘:‘text/plain;charset=UTF-8‘});if(request.url!=‘/favicon.ico‘){ ??let url = urlApi.parse(request.url,true); ??cosoleo.log(url); ??if(url.pathname==‘/a.html‘){ ???res.end(‘这里请求的是a.html，请求的参数是‘) ??}} response.end(‘收到请求！‘);}).listen(3000,()=>{ ??console.log(‘start‘)})//====解析url var http = require(‘http‘), ????server; sever = http.createServer(function(request,response){ ???response.writeHead(200,{‘Content-type‘:‘text/plain;charset=UTF-8‘}); ???let url = request.url; ???if(url！= ‘/favicon.ico‘){ ????let arr1 = url.split(‘?‘); ????let arr2 = arr1[1].split(‘&‘); ????let Obj = {}; ????arr2.map(function(data,i){ ????Obj[data.split(‘=‘)[0]]=data.split(‘=‘)[1];}) ????if(arr1[0]==‘/a.html‘){ ??????response.end(‘这里请求的是a.html,请求的参数是‘+JSON.stringify(Obj)); ????} ?} ?response.end(‘收到请求！‘);}).listen(3000);//=======处理post请求var http = require(‘http‘);var server = http.createServer((req,res)=>{ res.writeHead(200,{‘Content-type‘:‘text/plain;charset=UTF-8‘}); ??console.log(‘req,url‘); ??let str = ‘‘; ??res.on(data,(data)=>{ ??‘use strict‘; ??str+= data; ?}); ?res.on(‘end‘,()=>{ ??console.log(str); ?}); ?res.write(‘收到请求！‘); ?res.end();}).listen(3000);// 项目文件上传 formidable ?let http = require(‘http‘); ?let urlLib = require(‘url‘); ?let fs = require(‘fs‘); ?let pathLib = require(‘path‘); ?let formidable = reqiure(‘formidable‘); ?let server = http.createServer((req,res)=>{ ?let urlObj = urlLib.parse(req.url,true); ??if(urlObj.pathname===‘/‘){ ????res.readFile(‘./template/form.html‘,(err,data)=>{ ??res.write(data); ??res.end(); ???}) ??} ???if(urlObj===‘/upload‘){ ?????let form = formidable.IncomingForm(); ?????form.encoding = ‘utf-8‘; ?????form.upLoadDir = _dirname+‘/folder‘; ?????form.parse(req,function(err,fields,files){ ???if(err)throw err; ???console.log(files); ???let ext = pathLib.exname(files.wangpengde.name); ???let oldPath = files.wangpengde.path; ???let newPath = pathLib.join(_dirname,‘/folder/‘)+files.wangpengde.name; ???fs.rename(oldPath,newPath,(err)=>{ ????if(err)throw err; ????console.log(ext); ????res.writeHead(200,{‘content-type‘:‘text/plain;charset=UTF-8‘}); ????res.write(‘成功！‘); ????res.end(); ???}) ??}) ??}}) ??server.listen(3000,()=>{ ?console.log(‘start‘); ?}) ?三. http模块 ?const http = require(‘http‘); ?const ?cheerio = require(‘cheerio‘); ?http.get(‘http://www.easyvoa.com‘,function(res){ ???if(res.statusCode ==200){ ?????let str = ‘‘; ?????res.on(‘data‘,(data)=>{ ?????????str += data; ?????}); ?????res.on(‘end‘,()=>{ ???????const $ = cheerio.load(str); ???????const titles = $(‘.title_a‘); ?????for(let i = 0; i<titles.length ;i++){ ????????console.log(titles.eq(i).text()); ?????} ?????}) ???}})