Simple implementation code for nodeJs crawler to obtain data_node.js

var http=require('http');
var cheerio=require('cheerio');//页面获取到的数据模块
var url='http://www.jcpeixun.com/lesson/1512/';
function filterData(html){
  /*所要获取到的目标数组 
　　 var courseData=[{
    chapterTitle:"",
    videosData:{
      videoTitle:title,
      videoId:id,
      videoPrice:price
    }
  }] */
  var $=cheerio.load(html);
  var courseData=[];
  var chapters=$(".list-collapse");
  chapters.each(function(item){
    var chapterTitle=$(this).find(".collapse-head").find("label").text();
    var videos=$(this).find(".listview5").children("li");
    var chaptersData={
      chaptersTitle:chapterTitle,
      videosData:[]
    }
    videos.each(function(item){
      var videoTitle=$(this).find(".ml10").attr('data-lesson-name');
      var videoId=$(this).find(".ml10").attr('data-lesson-id');
      var vadeoPrice=$(this).find(".colblue").text();
      chaptersData.videosData.push({
        title:videoTitle,
        id:videoId,
        price:vadeoPrice
      })
    })
    courseData.push(chaptersData) 
  })
  return courseData
}
function printCourseInfo(courseData){
  courseData.forEach(function(item){
    console.log(item.chaptersTitle+'\n');
    item.videosData.forEach(function(item){
      console.log(item.title+'【'+item.id+'】'+item.price+'\n')
    })
  })
}
http.get(url,function(res){
  html="";
  res.on("data",function(data){
    html+=data
  })
  res.on('end',function(){
    var courseData=filterData(html);
    printCourseInfo(courseData)
  })
})