我如何为 Chrome 扩展编写 JavaScript 代码，向下滚动到最后（我想获得所有 Facebook 好友列表）

Question

I'm working on a Chrome extension and I have to read all my friends on Facebook without API. I have used window.scrollTo(0, document.body.scrollHeight); in while loop with sleep function in Javascript but sleep pause all the javascript execution and Facebook data not load well.

friend list link https://web.facebook.com/profile-id/friends_all

Answer 1

You can implement it this way- scroll, wait for the more content to load, compare scroll heights, and repeat if more content was loaded. Here's the implementation with async/await and setTimeout sleep duration:

(async (sleepDuration = 2000) => {
  let previousHeight;
  let newHeight = document.body.scrollHeight;
  do {
    previousHeight = newHeight;
    window.scrollTo(0, previousHeight);
    await new Promise(resolve => setTimeout(resolve, sleepDuration));
    newHeight = document.body.scrollHeight;
  } while (previousHeight !== newHeight);
})();