Adds a persistent playback speed controller to the TikTok website. The selected speed is saved and applied to all videos automatically.
// ==UserScript==
// @name TikTok Playback Speed Controller
// @name:zh-CN 抖音/TikTok 播放速度控制器
// @namespace http://tampermonkey.net/
// @version 1.3
// @description Adds a persistent playback speed controller to the TikTok website. The selected speed is saved and applied to all videos automatically.
// @description:zh-CN 在 TikTok 网站上添加一个持久的播放速度控制器。所选速度将被保存并自动应用于所有视频。
// @author Gemini
// @match https://www.tiktok.com/*
// @grant GM_setValue
// @grant GM_getValue
// @run-at document-idle
// @license MIT
// ==/UserScript==
(function() {
'use strict';
// --- 配置项 ---
const SPEED_OPTIONS = [1.0, 1.25, 1.5, 2.0, 2.5, 3.0]; // 可用的速度选项
const DEFAULT_SPEED = 1.0; // 默认速度
// --- 脚本核心逻辑 ---
// 1. 获取已保存的速度或使用默认值
let currentSpeed = GM_getValue('tiktok-playback-speed', DEFAULT_SPEED);
/**
* 将指定速度应用到页面上所有 <video> 元素
* @param {number} speed - 播放速度
*/
function applySpeedToVideos(speed) {
const videoElements = document.querySelectorAll('video');
videoElements.forEach(video => {
if (video.playbackRate !== speed) {
video.playbackRate = speed;
}
});
}
/**
* 创建并注入UI控件
*/
function createControllerUI() {
// --- 创建面板容器 ---
const panel = document.createElement('div');
panel.id = 'tiktok-speed-controller-panel';
panel.innerHTML = `<div id="tsc-header">播放速度</div>`;
// --- 创建速度按钮 ---
const buttonsContainer = document.createElement('div');
buttonsContainer.id = 'tsc-buttons';
panel.appendChild(buttonsContainer);
SPEED_OPTIONS.forEach(speed => {
const button = document.createElement('button');
button.innerText = `${speed}x`;
button.dataset.speed = speed;
if (speed === currentSpeed) {
button.classList.add('active');
}
button.addEventListener('click', handleSpeedChange);
buttonsContainer.appendChild(button);
});
document.body.appendChild(panel);
injectStyles();
makeDraggable(panel);
}
/**
* 处理速度变更事件
* @param {Event} event - 点击事件对象
*/
function handleSpeedChange(event) {
const newSpeed = parseFloat(event.target.dataset.speed);
if (currentSpeed !== newSpeed) {
currentSpeed = newSpeed;
GM_setValue('tiktok-playback-speed', newSpeed); // 保存新速度
applySpeedToVideos(newSpeed);
updateActiveButton(newSpeed);
}
}
/**
* 更新UI，高亮当前激活的速度按钮
* @param {number} activeSpeed - 当前激活的速度
*/
function updateActiveButton(activeSpeed) {
const buttons = document.querySelectorAll('#tsc-buttons button');
buttons.forEach(btn => {
if (parseFloat(btn.dataset.speed) === activeSpeed) {
btn.classList.add('active');
} else {
btn.classList.remove('active');
}
});
}
/**
* 注入CSS样式
*/
function injectStyles() {
const styles = `
#tiktok-speed-controller-panel {
position: fixed;
top: 100px;
right: 20px;
background-color: rgba(22, 24, 35, 0.85);
color: white;
border-radius: 8px;
padding: 10px;
z-index: 99999;
font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
backdrop-filter: blur(5px);
border: 1px solid rgba(255, 255, 255, 0.1);
}
#tsc-header {
font-weight: 600;
text-align: center;
margin-bottom: 8px;
cursor: move; /* 添加拖动光标 */
user-select: none;
}
#tsc-buttons {
display: grid;
grid-template-columns: 1fr 1fr 1fr;
gap: 6px;
}
#tsc-buttons button {
background-color: rgba(255, 255, 255, 0.1);
color: white;
border: 1px solid rgba(255, 255, 255, 0.2);
border-radius: 4px;
padding: 5px 8px;
cursor: pointer;
transition: background-color 0.2s, transform 0.1s;
font-size: 12px;
}
#tsc-buttons button:hover {
background-color: rgba(255, 255, 255, 0.2);
}
#tsc-buttons button:active {
transform: scale(0.95);
}
#tsc-buttons button.active {
background-color: #fe2c55; /* TikTok 主题色 */
border-color: #fe2c55;
font-weight: bold;
}
`;
const styleSheet = document.createElement("style");
styleSheet.type = "text/css";
styleSheet.innerText = styles;
document.head.appendChild(styleSheet);
}
/**
* 使元素可拖动 (已优化)
* @param {HTMLElement} element - 需要拖动的面板元素
*/
function makeDraggable(element) {
let pos1 = 0, pos2 = 0, pos3 = 0, pos4 = 0;
const header = document.getElementById('tsc-header');
if (header) {
header.onmousedown = dragMouseDown;
}
function dragMouseDown(e) {
e.preventDefault();
// --- 优化开始 ---
// 在开始拖动前，获取当前元素的精确位置，并将定位方式从 'right' 切换到 'left'
// 这样可以避免在拖动过程中 'left' 和 'right' 属性发生冲突
const rect = element.getBoundingClientRect();
element.style.top = rect.top + 'px';
element.style.left = rect.left + 'px';
element.style.right = 'auto';
// --- 优化结束 ---
pos3 = e.clientX;
pos4 = e.clientY;
document.onmouseup = closeDragElement;
document.onmousemove = elementDrag;
}
function elementDrag(e) {
e.preventDefault();
pos1 = pos3 - e.clientX;
pos2 = pos4 - e.clientY;
pos3 = e.clientX;
pos4 = e.clientY;
// 因为现在 top 和 left 属性已被明确设置，所以可以安全地进行计算
element.style.top = (element.offsetTop - pos2) + "px";
element.style.left = (element.offsetLeft - pos1) + "px";
}
function closeDragElement() {
document.onmouseup = null;
document.onmousemove = null;
}
}
// --- 启动与监听 ---
// 使用 MutationObserver 监听新视频的加载
const observer = new MutationObserver((mutationsList) => {
for (const mutation of mutationsList) {
if (mutation.type === 'childList' && mutation.addedNodes.length > 0) {
// 当有新节点添加时，延迟一小段时间后应用速度，确保video元素已准备好
setTimeout(() => applySpeedToVideos(currentSpeed), 200);
return;
}
}
});
// 等待页面加载完成后开始执行
window.addEventListener('load', () => {
createControllerUI();
applySpeedToVideos(currentSpeed); // 对初始视频应用速度
// 监视整个文档的变化，以捕获动态加载的视频
observer.observe(document.body, {
childList: true,
subtree: true
});
}, false);
})();
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