有一个内置的选项：

await page.goto('https://www.digg.com/', {"waitUntil" : "networkidle0"});

networkidle0-当至少500毫秒内没有超过0个网络连接时，认为导航已完成
networkidle2-当至少500毫秒内没有超过2个网络连接时，认为导航完成。
当然，如果你使用的是像Twitter这样的无休止滚动的单页应用程序，它就不起作用了。
Puppeteer GitHub issue #1552为networkidle2背后的动机提供了解释。

另一个选项，实际计算以在加载所有图像时获得回调
此选项也适用于不支持wait networkidle0选项的setContent

await page.evaluate(async () => {
  const selectors = Array.from(document.querySelectorAll("img"));
  await Promise.all(selectors.map(img => {
    if (img.complete) return;
    return new Promise((resolve, reject) => {
      img.addEventListener('load', resolve);
      img.addEventListener('error', reject);
    });
  }));
})

等待延迟加载图像

您可能需要考虑先使用Element.scrollIntoView()之类的方法向下滚动，以解决延迟加载图像的问题：

await page.goto('https://www.digg.com/', {
  waitUntil: 'networkidle0', // Wait for all non-lazy loaded images to load
});

await page.evaluate(async () => {
  // Scroll down to bottom of page to activate lazy loading images
  document.body.scrollIntoView(false);

  // Wait for all remaining lazy loading images to load
  await Promise.all(Array.from(document.getElementsByTagName('img'), image => {
    if (image.complete) {
      return;
    }

    return new Promise((resolve, reject) => {
      image.addEventListener('load', resolve);
      image.addEventListener('error', reject);
    });
  }));
});

我也面临着同样的问题。我有一种感觉，解决方案将涉及使用：

await page.setRequestInterceptionEnabled(true);

page.on('request', interceptedRequest => {
    //some code here that adds this request to ...
    //a list and checks whether all list items have ...
    //been successfully completed!
});

https://github.com/GoogleChrome/puppeteer/blob/master/docs/api.md#pagesetrequestinterceptionenabledvalue

我找到了一个解决方案，它适用于多个网站使用**page.setViewPort（...）**方法如下：

const puppeteer = require('puppeteer');

async(() => {
    const browser = await puppeteer.launch({
        headless: true, // Set to false while development
        defaultViewport: null,
        args: [
            '--no-sandbox',
            '--start-maximized', // Start in maximized state
        ],
    });

    const page = await = browser.newPage();
    await page.goto('https://www.digg.com/', {
        waitUntil: 'networkidle0', timeout: 0
    });

    // Get scroll width and height of the rendered page and set viewport
    const bodyWidth = await page.evaluate(() => document.body.scrollWidth);
    const bodyHeight = await page.evaluate(() => document.body.scrollHeight);
    await page.setViewport({ width: bodyWidth, height: bodyHeight });

    await page.waitFor(1000);
    await page.screenshot({path: 'digg-example.png' });
})();