2020-02-24 实现一个抽奖程序

[fanmingfei]

写一个爬虫，收集一下所有回复ISSUE做题的人，并且抽出一人中奖。
ps：不需要有UI，只需要有程序就好，不一定非要在浏览器中跑，node里面跑也可以。

[joker1148]

var request = require('request');
var cheerio = require('cheerio');

let num = 0
let resultArr = []
function filter(data){
    var $ = cheerio.load(data);
    var temp_arr = $('strong[class = "css-truncate"]').text();
    let res = temp_arr.replace(/\s+/g, ' ').split(" ")
    var result = res.filter(function (res) {
        return res && res.trim()
    });
    return result
}
function getName(){
    for(let i = 1;i<=15;i++){
        request(`https://github.com/SlashLabTeam/2021questions/issues/${i}`, function (error, response, body) {
            console.log(`====正在爬第${i}页====`)    
            if (!error && response.statusCode == 200) {
              let arr = filter(body)
              resultArr.push(...arr)
              console.log(resultArr)
              num++
              console.log("num:"+num)
            }
            if(num==15){
                setTimeout(()=>{
                    let len = resultArr.length
                    let win = Math.floor(Math.random()*len)
                    console.log("总人数："+len)
                    console.log("赢家："+resultArr[win])
                    return 
                },1000)     
            }
          })
    }
    return
}
getName()

[xiaosen7]

const axios = require('axios');
const BASE_URL = 'https://github.com/SlashLabTeam/2021questions/issues';
const reg1 = /issue\_(\d+)\_link/g
const reg2 = new RegExp("<a class=\"author link-gray-dark css-truncate-target width-fit\"[^>]+>([^<]+)</a>", 'g');

console.log("正在爬取网页");
axios.get(BASE_URL).then(({ data: html }) => {

    console.log("正在获取选手");

    const bucket = [], promisis = [], users = [];

    html.replace(reg1, (_, i) => {
        bucket.push(BASE_URL + `/${i}`)
    })

    bucket.forEach(url => {

        promisis.push(axios.get(url).then(({ data: html }) => {
            html.replace(reg2, (_, name) => {
                if (!users.includes(name))
                    users.push(name);
            });
        }));
    });

    Promise.all(promisis).then(res => {
        console.log(...users);

        console.log('正在抽取幸运选手');

        console.log(users[Math.ceil(Math.random() * users.length - 1)]);
    }, e => {
        console.log(e);
    });
});