gistfile1.js

const axios = require("axios");
const cheerio = require("cheerio");

const headers = {
  Origin: "https://www.v2ex.com",
  Referer: "https://www.v2ex.com/signin",
  Host: "www.v2ex.com",
  'Content-Type': 'application/x-www-form-urlencoded',
};

const login = async () => {
  const response = await axios.get("https://v2ex.com/signin");

  const $ = cheerio.load(response.data);

  const inputList = $("input.sl");

  const params = {
    username: "",
    password: "",
    captcha: "",
    once: "",
    next: "/",
  };
  const keys = Object.keys(params);

  inputList.each((i, input) => {
    const key = keys[i];
    params[key] = $(input).attr("name") || "";
  });

  params.once = $("input[name=once]").attr("value") || "";

  const data = {
    [params.username]: "123",
    [params.password]: "233",
    [params.captcha]: "4444",
    once: params.once,
    next: "/",
  };

  const res = await axios.post("https://v2ex.com/signin", data, {
    headers,
    withCredentials: true,
  });

  console.log("res", res.data)
};

login();