Beginner Nodejs---http little crawler

1 //http Small Reptile2 //xxxxx similar to $. Ajaxxxxxxx3 4 5 varHTTP = require (' http ');//Loading HTTP Modules6 7 varCheerio = require (' Cheerio ');//loading third-party modules cheerio like jquery8 9 //Installation Method NPM Install CheerioTen  One  A functionPrintcourseinfo (Coursedata) {//Print function incoming fetch data -Coursedata.foreach (function(item) {//Cycle Printing -         varChaptertitle =Item.chaptertitle; the  -Console.log (chaptertitle + ' \ n ')); -  -Item.videos.forEach (function(video) { +Console.log (' [' + video.id + '] ' + video.title + ' \ n '); -         }) +     }) A } at  -  - functionFliterchapters (HTML) {//Data Filter Functions -  -     var$ =cheerio.load (HTML); -  in     varChapters = $ ('. Chapter ')//get Element -  to  + //Target data Structure -     /*    [{ the captertitle: ", * videos: ", $ ID: "Panax Notoginseng         }]*/ -  the     varCoursedata = [];//Storing Arrays +  A  theChapters.each (function(item) { +         varChapters = $ ( This); -  $         varChaptertitle = Chapters.find (' strong ')). text (); $  -  -         varVideos = Chapters.find ('. Video '). Children (' Li ')); the  -         varChapterdata = {Wuyi Chaptertitle:chaptertitle, the videos: [] -         } Wu  -Videos.each (function(item) { About             varVideo = $ ( This). Find ('. J-media-item '); $             varVideotitle =Video.text (); -             varid = video.attr (' href '). Split (' video/') [1] -  -  A ChapterData.videos.push ({ + Title:videotitle, the Id:id -             }) $         }) the  the  the Coursedata.push (chapterdata); the     }) -  in     returnCoursedata//data stitching completed and returned the  the } About  the //Destination URL the varurl = ' http://www.imooc.com/learn/348 ';//Mu class net the  +  -  the //using the Get methodBayiHttp.get (URL,function(RES) {//Get method Crawl substitution code the     varhtml = ' '; the  -Res.on (' Data ',function(data) {//Get Data Events -HTML + =data; the     }) the  theRes.on (' End ',function() {//Get End Event the         varCoursedata =fliterchapters (HTML); -  the Printcourseinfo (coursedata); the     }) the 94}). On (' Error ',function() { theConsole.log (' Get Error! ‘);//Error the})

Beginner Nodejs---http crawler