page.evaluate() - 文档未定义

Question

我尝试使用 Puppeteer 获取网站文档，但不知何故 page.evaluate 无法按照我的想法工作。

  let browser = await puppeteer.launch({headless:true});
  let page = await browser.newPage();
  await page.setViewport({
    width: 1920,
    height: 1080
  })
  await page.goto('https://www.tradingview.com/chart/');

  const doc = await page.evaluate(() => {
    return document;
  });
  
  console.log(doc)

当我打印 doc 时，它打印出 undefined

Answer 1

不幸的是，page.evaluate() can only transfer serializable values (roughly, the values JSON can handle). As document returns a DOM element that is not serializable (it contains methods and circular references), it is replaced with undefined. You need to return either serializable value (for example, document.body.innerText) or use something like page.evaluateHandle() and JSHandle API。

page.evaluate() - 文档未定义

page.evaluate() - document is not defined

javascript

node.js

puppeteer

chromium