如何使用 puppeteer 抓取视频 url？

Question

我正在尝试使用 puppeteer 抓取 Instagram 视频的视频 url，但无法做到。 它返回 null 作为响应

这是我的代码

async function getVideo(){
  const launch = await puppeteer.launch({headless: true});
  const page = await launch.newPage();
  await page.goto('https://www.instagram.com/p/CfW5u5UJmny/?hl=en');
  const video = await page.evaluate(() => {
      return document.querySelector('video').src;
  });

  console.log(video); returns null

  await launch.close();
}

example ur: https://instagram.fluh1-1.fna.fbcdn.net/v/t50.16885-16/290072800_730588251588660_5005285215058589375_n.mp4?efg=eyJ2ZW5jb2RlX3RhZyI6InZ0c192b2RfdXJsZ2VuLjcyMC5pZ3R2LmJhc2VsaW5lIiwicWVfZ3JvdXBzIjoiW1wiaWdfd2ViX2RlbGl2ZXJ5X3Z0c19vdGZcIl0ifQ&_nc_ht=instagram.fluh1-1.fna.fbcdn.net&_nc_cat=100&_nc_ohc=ROJWkaOqkQcAX_z -_Ls&edm=AP_V10EBAAAA&vs=440468611258459_2442386419&_nc_vs=HBksFQAYJEdPQW9TaEUwaURaVmQ1Z0NBTC0yRkV0aVdIWkZidlZCQUFBRhUAAsgBABUAGCRHTEdvVHhGMWFjUUpsMzhDQUZNT0c1cV8wT3c1YnZWQkFBQUYVAgLIAQAoABgAGwGIB3VzZV9vaWwBMRUAACaa%2BO%2FYnLPeQBUCKAJDMywXQCDdsi0OVgQYEmRhc2hfYmFzZWxpbmVfMV92MREAdewHAA%3D%3D&ccb=7-5&oh=00_AfCBrACQlXOqmbGSWRk_6Urv_fmHJUFDIt-8w6EO0_UcHQ&oe=638D6CBD&_nc_sid=4f375e

Answer 1

您正在加载 Instagram 页面。 由于加载需要一点时间，所以我使用setTimeout function等待。 Puppeteer 也有许多内置函数可以用来获取 src，如下所示。

async function getVideo(){
  const launch = await puppeteer.launch({headless: false});
  const page = await launch.newPage();
  await page.goto('https://www.instagram.com/p/CfW5u5UJmny/?hl=en');
  setTimeout(async () => {
    let src = await page.$eval("video", n => n.getAttribute("src"))
    console.log(src);
    await launch.close();
  }, 1000)
}