问pageFunction返回空对象

EN

const puppeteer = require('puppeteer');

(async() => {
  const browser = await puppeteer.launch({
    headless: false,
    slowMo: 1000
  });
  const page = await browser.newPage();
  await page.goto('https://www.google.com/search?q=news');

  const result1 = await page.$eval('#resultStats', elem => elem.textContent)
  console.log('result1', result1);  // returns 'About 2,890,000,000  results (0.45 seconds)'.  This is expected behavior straight from puppeeteer docs

  const result2 = await page.$eval('#resultStats', elem => elem)
  console.log('result2', result2);  // returns and empty object.  Why?  I would have expected to see a DOM Node Object here

  await browser.close();
})();