• controller/home.js
    1. const {Controller}=require("egg")
    2. const fs=require("fs")
    3. const path=require("path")
    5. class HomeController extends Controller{
    6. async  api(){
    7.      let {ctx}=this
    8.        let list=await ctx.service.home.list()
    9.        let filePath=path.join(__dirname,'../public/data.json')
    10.        fs.writeFileSync(filePath,JSON.stringify(list))
    11.      ctx.body={code:1,data:list}
    12.    }
    13. }
    14. module.exports =HomeController
    • service/home.js
    1. const cheerio = require("cheerio")
    2. const { Service } = require("egg")
    3. const superagent = require("superagent")
    4. class HomeService extends Service {
    5.   async  list() {
    6.         return new Promise((resolve, reject) => {
    7.             superagent.get("https://cnodejs.org").end((err,res) => {
    9.                 const $ = cheerio.load(res.text)
    10.                 let list = [];
    11.                 $('.cell').map((item, index) => {
    12.                     list.push({
    13.                         author: $(index).find('.pull-left').attr('href').slice(6),
    14.                         title: $(index).find('.topic_title').text().replace(/\n/, '').trim(),
    15.                         href: $(index).find('.pull-right').attr('href') || ''
    16.                     })
    17.                 })
    18.                 resolve(list)
    20.             })
    21.         })
    24.     }
    25. }
    26. module.exports = HomeService

    -得到数据

    1. [
    2.     {
    3.         "author": "atian25",
    4.         "title": "Node 12 值得关注的新特性",
    5.         "href": "/topic/5cbfd9aca86ae80ce64b3175#5d544129697873456c6bd629"
    6.     },
    7.     {
    8.         "author": "alsotang",
    9.         "title": "服务器迁移至 aws 日本机房",
    10.         "href": "/topic/5bd4772a14e994202cd5bdb7#5d4b976212a0194544415223"
    11.     },
    12.     {
    13.         "author": "daGaiGuanYu",
    14.         "title": "typescript 中修改 Date 的 prototype，添加了 export 语句后出现了问题。",
    15.         "href": "/topic/5d51302d12a0194544416048#5d56221212a01945444171d7"
    16.     },
    17.     {
    18.         "author": "zilin9980",
    19.         "title": "个人网站实现收款的几种方式",
    20.         "href": "/topic/5d36c34effed731686461c92#5d5614d912a019454441719a"
    21.     }
    22. ]