nodejs .http模块, cheerio模块 实现 小爬虫.

代码:

 var http = require("http");

 var cheerio = require("cheerio");

 var url = 'http://www.imooc.com/learn/348';

 http.get(url, function(res){

     var html = '';

     res.on('data', function(data){

         html += data;

     });

     res.on('end', function(){

         var courseData = filterChapters(html);

         printCourseInfo(courseData);

         console.log(courseData);

     });

 }).on('error', function(){

     console.log("获取课程数据出错!");

 });

 function filterChapters(html)

 {

     var $ = cheerio.load(html);

     //所有章节

     var chapters = $('.chapter');

     var courseData = [];

     chapters.each(function(item){

         var chapter = $(this);

         var chapterTitle = chapter.find('h3 strong').text().replace(/\r|\n/ig,"").trim();

         var videos = chapter.find(".video").children('li');

         var chapterData = {

             chapterTitle: chapterTitle,

             videos: []

         };

         videos.each(function(index, item2) {

             var video = $(this).find('.J-media-item');

             var videoTitle = video.text().replace(/\r|\n/ig,"").trim();

             var id = video.attr('href').split('video/')[1];

             chapterData.videos.push({

                 title: videoTitle,

                 id: id

             })

         });

         courseData.push(chapterData);

     });

     return courseData;

 }

 function printCourseInfo(courseData)

 {

     courseData.forEach(function(item){

         var chapterTitle = item.chapterTitle;

         console.log(chapterTitle + '\n');

         item.videos.forEach(function(video){

             console.log('   [' + video.id+ ']' + video.title);

         });

     });

 }

运行:

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参考链接:

• http小爬虫
• Node.js的学习--使用cheerio抓取网页数据