用Puppeteer抓取下拉菜单而不抓取子菜单的最好方法是什么？

const puppeteer = require('puppeteer');

async function scrapeDropdownMenu() {
  const browser = await puppeteer.launch();
  const page = await browser.newPage();
  await page.goto('https://example.com');

  // 通过evaluate函数执行DOM操作
  const dropdownMenu = await page.evaluate(() => {
    // 获取下拉菜单元素
    const dropdown = document.querySelector('.dropdown');

    // 关闭子菜单
    const subMenus = dropdown.querySelectorAll('.submenu');
    subMenus.forEach(subMenu => {
      subMenu.style.display = 'none';
    });

    // 返回下拉菜单的HTML内容
    return dropdown.innerHTML;
  });

  console.log(dropdownMenu);

  await browser.close();
}

scrapeDropdownMenu();