node简单爬虫request简单运用

const request = require('request');
const iconv = require('iconv-lite');
const jsdom = require('jsdom').JSDOM;
const fs = require('fs')
const BS_URL = 'https://www.menworld.org'

request({
    url: `${BS_URL}/fanhao/`,//请求路径
    method: "GET",//请求方式，默认为get
    headers: {//设置请求头
        "content-type": "application/json",
    },
    encoding: null
    // body: JSON.stringify(requestData)//post参数字符串
}, function (error, response, body) {
    if (!error && response.statusCode == 200) {
        fs.mkdir('img', err => console.log(err))
        let buf = iconv.decode(body, 'gb2312').toString(); //解码gb2312
        let dom = new jsdom(buf);

        let box = dom.window.document.getElementsByClassName('lml_top')
        for (let i = 0; i < box.length; i++) {
            let href = box[i].getElementsByTagName('a')[0].href;

            request({
                url: `${BS_URL + href}`,
                encoding: null
            }, (err, res, body) => {
                if (!error && response.statusCode == 200) {
                    let buf = iconv.decode(body, 'gb2312').toString(); //解码gb2312
                    let dom = new jsdom(buf);

                    let box = dom.window.document.getElementsByClassName('article')


                    for (let j = 0; j < box.length; j++) {
                        let img = box[j].getElementsByTagName('img')[0].src;
                        request(img).pipe(fs.createWriteStream(`./img/${i}.jpg`))
                    }

                }
            })

        }

    }
});