实现个简单爬虫

const express = require('express')
const router = express.Router()
const cheerio = require('cheerio')
const superagent = require('superagent')

router.get('/', async function (req, res, next) {
  const result = await superagent.get('https://zhuanwan.github.io/blogs/')

  const $ = cheerio.load(result.text)

  // 解析img
  const imgArr = []
  const imgs = $('img')
  imgs.map((i, ele) => {
    let json = {}
    let $ele = $(ele)
    json.src = $ele.attr('src')
    json.class = $ele.attr('class')
    json.alt = $ele.attr('alt')
    imgArr.push(json)
  })

  // 解析link
  const linkArr = []
  const links = $('link')
  links.map((i, ele) => {
    let json = {}
    let $ele = $(ele)
    json.href = $ele.attr('href')
    json.rel = $ele.attr('rel')
    json.as = $ele.attr('as')
    linkArr.push(json)
  })

  res.send({
    imgArr,
    linkArr
  })
})

module.exports = router