var http=require('http');var cheerio=require('cheerio'); var url='http://www.imooc.com/learn/348'; /****************************打印得到的數(shù)據(jù)結(jié)構(gòu)[{ chapterTitle:'', videos:[{  title:'',  id:'' }]}]********************************/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+'/n');  }) });}  /*************分析從網(wǎng)頁里抓取到的數(shù)據(jù)**************/function filterChapter(html){ var courseData=[];  var $=cheerio.load(html); var chapters=$('.chapter'); chapters.each(function(item){  var chapter=$(this);  var chapterTitle=chapter.find('strong').text(); //找到章節(jié)標(biāo)題  var videos=chapter.find('.video').children('li');   var chapterData={   chapterTitle:chapterTitle,   videos:[]  };   videos.each(function(item){   var video=$(this).find('.studyvideo');   var title=video.text();   var id=video.attr('href').split('/video')[1];    chapterData.videos.push({    title:title,    id:id   })  })   courseData.push(chapterData); });  return courseData;} http.get(url,function(res){ var html='';  res.on('data',function(data){  html+=data; })  res.on('end',function(){  var courseData=filterChapter(html);  printCourseInfo(courseData); })}).on('error',function(){ console.log('獲取課程數(shù)據(jù)出錯');})