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YouTube 标准画质

只允许 YouTube 选择 1080P60、1080P30、720P60、720P30 画质。避免由于网络问题卡顿：高画质用不上费流量、低网速降画质瞎眼睛。

  1. // ==UserScript==
  2. // @name         YouTube 标准画质
  3. // @description  只允许 YouTube 选择 1080P60、1080P30、720P60、720P30 画质。避免由于网络问题卡顿：高画质用不上费流量、低网速降画质瞎眼睛。
  4. // @match        https://www.youtube.com/*
  5. // @version       1.0
  6. // @author         yzcjd
  7. // @author2       ChatGPT4 辅助
  8. // @namespace   https://greasyfork.org/users/1171320
  9. // @license MIT
  10. // ==/UserScript==
  11.  
  12.  
  13. (function() {
  14.   'use strict';
  15.  
  16.   // 定义优先顺序
  17.   const preferredQualities = ['hd1080', 'hd720'];
  18.  
  19.   // 监听播放状态变化
  20.   function hookPlayer() {
  21.     const checkPlayer = () => {
  22.       const player = document.getElementById('movie_player');
  23.  
  24.       if (!player || typeof player.getAvailableQualityLevels !== 'function') {
  25.         setTimeout(checkPlayer, 500);
  26.         return;
  27.       }
  28.  
  29.       console.log('[YouTube Quality Filter] Player ready, binding events.');
  30.  
  31.       player.addEventListener('onStateChange', function(state) {
  32.         if (state === 1) { // 播放开始
  33.           console.log('[YouTube Quality Filter] Playing - enforcing quality.');
  34.           enforceQuality(player);
  35.         }
  36.       });
  37.  
  38.       // 视频切换或重新加载时，也重新检测
  39.       setInterval(() => {
  40.         enforceQuality(player);
  41.       }, 30000); // 每30秒强制一次，确保不会被降回高画质
  42.     };
  43.  
  44.     checkPlayer();
  45.   }
  46.  
  47.   function enforceQuality(player) {
  48.     if (!player || typeof player.getAvailableQualityLevels !== 'function') return;
  49.  
  50.     const levels = player.getAvailableQualityLevels(); // 获取当前可用画质
  51.     console.log('[YouTube Quality Filter] Available qualities:', levels);
  52.  
  53.     let targetQuality = null;
  54.  
  55.     if (levels.includes('hd1080')) {
  56.       targetQuality = 'hd1080';
  57.     } else if (levels.includes('hd720')) {
  58.       targetQuality = 'hd720';
  59.     }
  60.  
  61.     if (targetQuality) {
  62.       console.log('[YouTube Quality Filter] Setting quality to:', targetQuality);
  63.       player.setPlaybackQualityRange(targetQuality, targetQuality);
  64.       player.setPlaybackQuality(targetQuality);
  65.     }
  66.   }
  67.  
  68.   // 监听YouTube内部的导航完成
  69.   window.addEventListener('yt-navigate-finish', () => {
  70.     console.log('[YouTube Quality Filter] Navigation detected - Re-hooking player.');
  71.     setTimeout(hookPlayer, 1000);
  72.   });
  73.  
  74.   // 初次加载
  75.   hookPlayer();
  76. })();