Node_初步了解（4）小爬虫

 var http=require('http');
 var cheerio=require('cheerio');
 var url='http://www.cnblogs.com/Lwd-linux/archive/2017/01.html';

 //获取
 function filterChapters(html){
     var $=cheerio.load(html);

     var chapters=$('.entrylistItem');

     var courseData=[];
     chapters.each(function(){
         var chapter=$(this);
         var chapterTitle=chapter.find('.entrylistItemTitle').text();
         var summary=chapter.find('.c_b_p_desc').text();
         var chapterData={
             chapterTitle:chapterTitle,
             summary:summary
         };
         courseData.push(chapterData);
     })

     return courseData;
 }
 //打印
 function printCourseInfo(courseData){
     courseData.forEach(function(item){
         var chapterTitle=item.chapterTitle;
         console.log(chapterTitle+'\n');
         var summary=item.summary;
         console.log(summary+'\n');
     })
 }

 http.get(url,function(res){
     var html='';

     res.on('data',function(data){
         html+=data;
     })

     res.on('end',function(){
         var courseData=filterChapters(html);
         printCourseInfo(courseData);
     }).on('error',function(){
         console.log('获取数据出错！');
     })
 })