请问为什么没有内容出来
var http = require('http')
var cheerio = require('cheerio')
var url = "http://www.imooc.com/learn/348"
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.title+ '\n')
})
})
}
function filterChapters(html){
var $ = cheerio.load(html)
var chapters = $('.learnchapter')
// [{
// 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('.studyvideo')
var videoTitle = video.text()
var id = video.attr('href').split('video/')[1]
chapterData.videos.push({
title:videoTitle,
id:id
})
})
courseData.push(chapterData)
})
return courseData
}
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('获取课程数据出错')
})
})