Node_初步了解（4）小爬虫

var http=require('http');
var cheerio=require('cheerio');
var url='http://www.cnblogs.com/Lwd-linux/archive/2017/01.html';

//获取
function filterChapters(html){
    var $=cheerio.load(html);

    var chapters=$('.entrylistItem');

    var courseData=[];
    chapters.each(function(){
        var chapter=$(this);
        var chapterTitle=chapter.find('.entrylistItemTitle').text();
        var summary=chapter.find('.c_b_p_desc').text();
        var chapterData={
            chapterTitle:chapterTitle,
            summary:summary
        };
        courseData.push(chapterData);
    })

    
    return courseData;
}
//打印
function printCourseInfo(courseData){
    courseData.forEach(function(item){
        var chapterTitle=item.chapterTitle;
        console.log(chapterTitle+'\n');
        var summary=item.summary;
        console.log(summary+'\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('获取数据出错！');
    })
})