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)

    })

})