video watch page URL

Display "https://www.youtube.com/watch?v=***********" of embedded YouTube videos.
当前为 2019-03-08 提交的版本，查看最新版本。
换行
// ==UserScript==
// @name           video watch page URL
// @name:ja        埋め込み動画にURL表示
// @namespace      https://gf.qytechs.cn/users/19523
// @description    Display "https://www.youtube.com/watch?v=***********" of embedded YouTube videos.
// @description:ja ページに埋め込まれたYouTubeの動画の下に動画視聴ページのURLを付け加えます
// @include        *
// @exclude        http://www.youtube.com/*
// @exclude        https://www.youtube.com/*
// @version        0.3.1
// @grant          none
// ==/UserScript==


(function () {

var style = document.createElement('style');
style.type = 'text/css';
style.appendChild(document.createTextNode(`\
  a.youtube-url {
    position: relative;
    display: table;
    font-size: initial;
  }`));
document.getElementsByTagName('head')[0].appendChild(style);

var target = document.getElementsByTagName('body')[0];
var config = { childList: true, subtree: true };
var observer = new MutationObserver(function (mutations) {
  insertURL();
});

window.addEventListener('load', insertURL);

function insertURL() {
  observer.disconnect();

  var elements = document.querySelectorAll('iframe[src*="//www.youtube.com/embed/"]:not([class~="youtube-url"])');
  for (var i = 0, element; element = elements[i]; i++) {
    var a = document.createElement('a');
    if (element.src.indexOf('videoseries') >= 0) {
      a.href = element.src.replace(/embed\/videoseries/, 'playlist');
    } else {
      a.href = element.src.split('?')[0].replace(/embed\//, 'watch?v=');
    }
    a.appendChild(document.createTextNode(a.href));
    element.className += a.className = ' youtube-url';

    if (element.parentElement.children.length <= 2 && element.parentElement.parentElement) {
      element = element.parentElement;
    }
    element.parentElement.insertBefore(a, element.nextSibling);
    console.log('Detected URL: %s', elements[i].src);
  }

  var elements = document.querySelectorAll('iframe[src*="//www.youtube-nocookie.com/embed/"]:not([class~="youtube-url"])');
  for (var i = 0, element; element = elements[i]; i++) {
    var a = document.createElement('a');
    if (element.src.indexOf('videoseries') >= 0) {
      a.href = element.src.replace(/-nocookie\.com\/embed\/videoseries/, '.com/playlist');
    } else {
      a.href = element.src.split('?')[0].replace(/-nocookie\.com\/embed\//, '.com/watch?v=');
    }
    a.appendChild(document.createTextNode(a.href));
    element.className += a.className = ' youtube-url';

    if (element.parentElement.children.length <= 2 && element.parentElement.parentElement) {
      element = element.parentElement;
    }
    element.parentElement.insertBefore(a, element.nextSibling);
    console.log('Detected URL: %s', elements[i].src);
  }

  var elements = document.querySelectorAll('iframe[data-src*="//www.youtube.com/embed/"]:not([class~="youtube-url"])');
  for (var i = 0, element; element = elements[i]; i++) {
    var a = document.createElement('a');
    if (element.src.indexOf('videoseries') >= 0) {
      a.href = element.src.replace(/embed\/videoseries/, 'playlist');
    } else {
      a.href = element.src.split('?')[0].replace(/embed\//, 'watch?v=');
    }
    a.appendChild(document.createTextNode(a.href));
    element.className += a.className = ' youtube-url';

    if (element.parentElement.children.length <= 2 && element.parentElement.parentElement) {
      element = element.parentElement;
    }
    element.parentElement.insertBefore(a, element.nextSibling);
    console.log('Detected URL: %s', elements[i].src);
  }

  var elements = document.querySelectorAll('iframe[data-src*="//www.youtube-nocookie.com/embed/"]:not([class~="youtube-url"])');
  for (var i = 0, element; element = elements[i]; i++) {
    var a = document.createElement('a');
    if (element.src.indexOf('videoseries') >= 0) {
      a.href = element.src.replace(/-nocookie\.com\/embed\/videoseries/, '.com/playlist');
    } else {
      a.href = element.src.split('?')[0].replace(/-nocookie\.com\/embed\//, '.com/watch?v=');
    }
    a.appendChild(document.createTextNode(a.href));
    element.className += a.className = ' youtube-url';

    if (element.parentElement.children.length <= 2 && element.parentElement.parentElement) {
      element = element.parentElement;
    }
    element.parentElement.insertBefore(a, element.nextSibling);
    console.log('Detected URL: %s', elements[i].src);
  }

  // Flash-embedded videos
  var elements = document.querySelectorAll('embed[src*="//www.youtube.com/v/"]:not([class~="youtube-url"])');
  for (var i = 0, element; element = elements[i]; i++) {
    var a = document.createElement('a');
    a.href = element.src.split('?')[0].replace(/v\//, 'watch?v=');
    a.appendChild(document.createTextNode(a.href));
    element.className += a.className = ' youtube-url';
    element.parentElement.insertBefore(a, element.nextSibling);
    console.log('Detected URL: %s', elements[i].src);
  }

  var elements = document.querySelectorAll('embed[src*="//www.youtube-nocookie.com/v/"]:not([class~="youtube-url"])');
  for (var i = 0, element; element = elements[i]; i++) {
    var a = document.createElement('a');
    a.href = element.src.split('?')[0].replace(/-nocookie\.com\/v\//, '.com/watch?v=');
    a.appendChild(document.createTextNode(a.href));
    element.className += a.className = ' youtube-url';
    element.parentElement.insertBefore(a, element.nextSibling);
    console.log('Detected URL: %s', elements[i].src);
  }

  observer.observe(target, config);
}

})();
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