var http = require('http')

var cheerio = require('cheerio')

var url = 'http://www.xianlaiwan.cn/learn/637'

function filterChapters(html) {

var $ = cheerio.load(html)

var chapters = $('.chapter')

var courseData = []

function trim(str) {

return str.replace(/[\r\n ]/g, "") ?//去除字符算中的空格

}

chapters.each(function (index, item) {

var chapter = $(item)

var chapterTitle = chapter.find('h3').text().trim()

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

var chapterData = {

chapterTitle: chapterTitle,

videos: []

}

// console.log(chapterTitle);

videos.each(function (index, item) {

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

var videoTitle = video.text()

videoTitle = trim(videoTitle)

var id = video.attr('href').split('video/')[1]

// console.log(videoTitle);

chapterData.videos.push({

videoTitle: 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 (video) {

console.log('【' + video.id + '】' + video.videoTitle + '\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)

printCourseInfo(courseData);

})

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

console.log('獲取課程信息出錯！')

})