//引入依賴

//https請(qǐng)求

const https = require('https');

//簡(jiǎn)稱node版的jquery

const cheerio = require('cheerio');

//解決防止出現(xiàn)亂碼

const iconv = require('iconv-lite')

//http請(qǐng)求

const request = require("request");

//負(fù)責(zé)讀寫(xiě)文件

const fs = require('fs');

//處理文件路徑

const path = require('path');

const url = 'https://unsplash.com/';

//方法對(duì)象

const util = {

 

  getsrc: function (url) {

    https.get(url, res => {

      const chunks = [];

      res.on('data', chunk => {

        // chunks里面存儲(chǔ)著網(wǎng)頁(yè)的html內(nèi)容

        chunks.push(chunk);

      });

      res.on('end', e => {

 

        let ALL = [];

        //編碼格式

        let html = iconv.decode(Buffer.concat(chunks), 'utf8');

        let $ = cheerio.load(html, { decodeEntities: false });

 

        //標(biāo)簽遍歷

        $("figure img").each(function (idex, elent) {

          let $elent = $(elent);

          let $srcset = $elent.attr("srcset");

          if ($srcset != undefined) {

            let src = ($srcset.split(',').pop()).split('?')[0];

            ALL.push({

              src: src

            })

          }

        });

        //遍歷數(shù)組 每個(gè)后面加.jpg

        ALL.forEach(item => {

          util.downloadimg(item.src, path.basename(item.src) + ".jpg", function () {

            console.log(path.basename(item.src) + ".jpg");

          });

        })

      });

 

      res.on('error', e => {

        console.log('Error: ' + e.message);

      });

    });

  },

 

  //運(yùn)行主函數(shù)

  main: function () {

    console.log("------start--------");

    util.getsrc(url);

  },

  //下載圖片函數(shù)

  downloadimg: function (src, srcname, callback) {

 

    //http請(qǐng)求

    request.head(src, function (err, res, body) {

      if (err) {

        console.log('err:' + err);

        return false;

      }

      console.log('res: ' + res);

      //保存數(shù)據(jù)，這里是防止未來(lái)得及記錄數(shù)據(jù)又開(kāi)始讀取數(shù)據(jù)而導(dǎo)致數(shù)據(jù)丟失

      request(src).pipe(fs.createWriteStream('./img/' + srcname)).on('close', callback);

    });

  }

}

 

//主函數(shù)

util.main();