这段代码是与老师的一模一样,但是为什么在命令行运行后什么都不显示不加载呢?
var http=require('http')
var cheerio=require('cheerio')
var url='http://www.imooc.com/learn/348'
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]
// console.log('sssss')
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(video){
console.log(' 【' + videos.id + '】 ' + videos.title + '\n')
})
})
}
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('获取出错')
})