node 爬虫

const request = require('request');
const cheerio = require("cheerio");
const iconv = require('iconv-lite')

let url = 'http://m.17dm.com/wugengji/manhua/124112.html'
request(url,function (error, response, body) {
    if(response && response.statusCode == 200){
        var html = iconv.decode(body.toString(),'gb2312');
        var $ = cheerio.load(html)
    }
    
    console.log($('select[name="listNarImg"]').children("option:last-child").attr("value"))
});

// http://img.17dm.com/wugengji/manhua/2b21/17.jpg

const request = require('request');
const fs= require('fs')
let page = 8;
let setion = 21
let chapter = 2

async function downloadImage() {
    let url = `http://img.17dm.com/wugengji/manhua/${chapter}b${setion}/${page}.jpg`;
    if (!fs.existsSync(`wugeng/${chapter}`)) {//查看是否存在这个文件夹
        fs.mkdirSync(`wugeng/${chapter}`);
    }

    if (!fs.existsSync(`wugeng/${chapter}/${setion}`)) {//查看是否存在这个文件夹
        fs.mkdirSync(`wugeng/${chapter}/${setion}`);//不存在就建文件夹
        console.log(`wugeng/${chapter}/${setion} 文件夹创建成功`);
    } else {
        console.log(`wugeng/${chapter}/${setion} 文件夹已经存在`);
        
    }

    let headers ={
        'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.99 Safari/537.36',
        'Connection':'keep-alive'
    };

    await request({
        url: url,
        encoding: 'binary'
    },function (error, response, body) {
        if (!error && response.statusCode == 200) {
            console.log('开始下载')
            if(!body)  console.log("(╥╯^╰╥)哎呀没有内容。。。")
            fs.writeFile(`wugeng/${chapter}/${setion}/${page}.jpg`,body, 'binary', function (err) {
                if (err) {console.log(err);}
                console.log(`wugeng/${chapter}/${setion}/${page}.jpg 下载成功`);
        
            })
        }

        setTimeout(()=>{
            page++
            if(page == 34){
                setion++ 
                page = 1
            }
            if(setion == 64){
                chapter = 3
                setion = 1;
                page = 1
            }
            downloadImage()
        },300)
    })
}

downloadImage()