Cherio を使用して Node.js で単純な Web クローラーを作成する (詳細なチュートリアル)

const https = require('https');
const fs = require('fs');
const cheerio = require('cheerio');
const url = 'https://segmentfault.com/';

https.get(url, (res) => {
  let html = '';
  res.on('data', (data) => {
    html += data;
  });
  res.on('end', () => {
    getPageTitle(html);
  });
}).on('error', () => {
  console.log('获取网页信息错误');
});

function getPageTitle(html) {
  const $ = cheerio.load(html);
  let chapters = $('.news__item-title');
  let data = [];
  let index = 0;
  let fileName = 'pageTitle.txt';
  for (let i = 0; i < chapters.length; i++) {
    let chapterTitle = $(chapters[i]).find(&#39;a&#39;).text().trim();
    index++;
    data.push(`\n${index}, ${chapterTitle}`);
  }
  fs.writeFile(fileName, data, &#39;utf8&#39;, (err) => {
    if (err) {
      console.log(&#39;fs文件系统创建新文件失败&#39;, err);
    }
    console.log(`已成功将获取到的标题放入新文件${fileName}文件中`)
  })
}