Youtube Downloader

Add video download button in combo menu.
当前为 2023-12-11 提交的版本，查看最新版本。
换行
// ==UserScript==
// @name                Youtube Downloader
// @version             1.0.2
// @description         Add video download button in combo menu.
// @author              FawayTT
// @namespace           FawayTT
// @icon                https://i.imgur.com/D57wQrY.png
// @match               https://www.youtube.com/watch*
// @grant               none
// @license             MIT
// ==/UserScript==

(function () {
  let timeout;
  let replaced = false;

  function addButton() {
    if (document.location.href.includes('playlist') || document.getElementsByTagName('custom-dwn-button').length !== 0) return;
      const menu = document.getElementsByTagName('ytd-menu-popup-renderer')[0];
      const downButton = document.createElement('custom-dwn-button');
      const icon = document.createElement('div');
      const text = document.createElement('div');
      menu.style.minHeight = '100px';
      downButton.style.cssText = `
          cursor: pointer;
          margin-top: 8px;
          font-size: 1.4rem;
          line-height: 2rem;
          font-weight: 400;
          position: relative;
          color: var(--yt-spec-text-primary);
          font-family: "Roboto","Arial",sans-serif;
          white-space: nowrap;
          display: flex;
          padding: 10px 0 10px 21px;
          gap: 21px;
          align-items: center;`;
      icon.innerText = '⇩';
      text.innerText = 'Download';
      icon.style.cssText = `
            font-size: 2.1rem;`
      downButton.appendChild(icon);
      downButton.appendChild(text);
      downButton.addEventListener('click', onClick);
      downButton.addEventListener('mouseenter', ()=>{
        downButton.style.backgroundColor = 'rgba(255,255,255,0.1)';
      });
      downButton.addEventListener('mouseleave', ()=>{
        downButton.style.backgroundColor = '';
      });
      menu.insertBefore(downButton, menu.firstChild);
  }

  function watchMenu() {
      const menu = document.getElementById('button-shape');
      menu.addEventListener('click', addButton);
      replaced = true;
      clearTimeout(timeout);
  }

  function onClick() {
      window.open(document.location.href.replace('youtube', 'youtubepp'));
  }

  if (document.hidden) {
    window.addEventListener("visibilitychange", ()=>{
      if (document.hidden) return;
      for (let i = 0; i < 10; i++) {
         if (replaced) break;
         timeout = setTimeout(watchMenu, 500 * i);
      }
    })
  } else {
      for (let i = 0; i < 10; i++) {
         if (replaced) break;
         timeout = setTimeout(watchMenu, 500 * i);
      }
  }
})();