老師您好在您課程里的如下代碼中

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)

})

用到了兩個(gè)each循環(huán)和回調(diào)。其中都用到了 $(this)來(lái)獲取dom對(duì)象。對(duì)于這里$符號(hào)的使用以及this的作用域問(wèn)題，希望具體講解一下