安裝方法：

npm install -g cheerio

爬蟲代碼1：

var http = require('http');

var url = 'http://www.xianlaiwan.cn/learn/348';

http.get(url , function(res){

var html='';

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

html+=data;

});

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

console.log(html);

});

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

console.log('獲取課程數據出錯！')

});

爬蟲代碼2：

var http=require('http');

var cheerio=require('cheerio');

var url='http://www.xianlaiwan.cn/learn/348';

function filterChapters(html){

var $ = cheerio.load(html);

var chapters = $('.chapter');

/**

[{

chapterTitle:'',

videos:[

title:'',

id:''

]

}]

*/

var courseData=[];

chapters.each(function(item){ ??

var chapter = $(this);

var chapterTitle = chapter.find('strong').text();

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

var chapterData = {

chapterTitle : chapterTitle,

videos :[]

};

videos.each(function(item){

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

var videoTitle = video.text();

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(item){

console.log('【'+item.id+'】'+item.title+'\n');

});

});

};

http.get(url , function(res){

var html='';

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

html+=data;

});

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

// console.log(html);

var courseData = filterChapters(html);

//打印

printCourseInfo(courseData);

});

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

console.log('獲取課程數據出錯！')

});