1、 进入以下网址 https://qun.qq.com/member.html

2、 选择要获取的qq群

3、 F12打开控制台输入以下代码

4、代码：

var qq_sl = document.getElementById("groupMemberNum");
var qq_js = Math.trunc(qq_sl.innerHTML / 21);
var qq_number = 0;
window.scrollTo(0, document.body.scrollHeight);
let arr = [];
var qq_ds = setInterval(function () {
  window.scrollTo(0, document.body.scrollHeight);
  qq_number++;
  console.log("正在加载所有页面：" + qq_number + "/" + qq_js);
  if (qq_js <= qq_number) {
    clearInterval(qq_ds);
    console.log("加载完毕，正在获取页面所有QQ号码...");
    var classan = document.getElementsByClassName("mb");
    var number = classan.length;
    for (nr = 0; nr < number; nr++) {
      var class_qq = classan[nr].getAttribute("class");
      var qq = qq + "\n" + class_qq.substring(5);
    }
    arr.push(qq);
    console.log(qq);
  }
}, 500);