打开视频时通过监听事件更精确地回到视频开头处
目前為
// ==UserScript==
// @name BiliBackToBeginning (Improved)
// @namespace https://github.com/ImQQiaoO/BiliBackToBeginning
// @version v0.1.0
// @description 打开视频时通过监听事件更精确地回到视频开头处
// @author ImQQiaoO
// @match *://*.bilibili.com/video/*
// @match *://*.bilibili.com/list/*
// @match *://*.bilibili.com/watchlater/*
// @match *://*.bilibili.com/medialist/play/*
// @match *://*.bilibili.com/bangumi/play/*
// @exclude *://message.bilibili.com/*
// @exclude *://data.bilibili.com/*
// @exclude *://cm.bilibili.com/*
// @exclude *://link.bilibili.com/*
// @exclude *://passport.bilibili.com/*
// @exclude *://api.bilibili.com/*
// @exclude *://api.*.bilibili.com/*
// @exclude *://*.chat.bilibili.com/*
// @exclude *://member.bilibili.com/*
// @exclude *://www.bilibili.com/tensou/*
// @exclude *://www.bilibili.com/correspond/*
// @exclude *://live.bilibili.com/* // 排除所有直播页面
// @exclude *://www.bilibili.com/blackboard/*
// @grant none
// @license MIT
// ==/UserScript==
(function() {
'use strict';
// 设置和获取 localStorage
const STORAGE_KEY = "reset_bili_video_enabled";
function setEnabled(flag) {
localStorage.setItem(STORAGE_KEY, flag ? "1" : "0");
console.log(`[B站重置进度脚本] 设置已 ${flag ? '启用' : '禁用'}`);
}
function getEnabled() {
// 默认启用，如果localStorage没有记录的话
const storedValue = localStorage.getItem(STORAGE_KEY);
return storedValue === null || storedValue === "1";
}
// 创建设置面板
function createSettingsPanel() {
const style = `
#biliResetPanel {
position: fixed; bottom: 30px; right: 30px;
z-index: 99999; background: #fff; color: #333;
border: 1px solid #bbb; border-radius: 8px;
box-shadow: 0 6px 16px rgba(0,0,0,.1);
padding: 18px 26px 18px 18px; font-size: 16px;
display: none;
}
#biliResetPanel input[type=checkbox] { transform: scale(1.3); margin-right:8px; vertical-align: middle;}
#biliResetPanelClose { cursor:pointer;color: #f66; float:right; font-size: 18px; line-height: 1;}
#biliResetPanelBtn {
position: fixed; bottom: 30px; right: 30px;
z-index: 99998; background: #ffe2a0; color: #333;
border: 1px solid #bbb; border-radius: 50%;
width: 42px; height: 42px; text-align:center; line-height: 42px;
font-size: 24px; cursor: pointer; box-shadow: 0 3px 12px rgba(0,0,0,.08);
user-select: none; /* 防止意外选中文本 */
}
`;
// Ensure head exists before appending style
let head = document.head;
if (!head) {
head = document.createElement('head');
document.documentElement.insertBefore(head, document.body); // Basic fallback
}
const styleEl = document.createElement("style");
styleEl.textContent = style;
head.appendChild(styleEl);
// Ensure body exists before appending panel/button
const addPanelElements = () => {
if (!document.body) {
setTimeout(addPanelElements, 50); // Wait if body not ready
return;
}
// Panel content
const panel = document.createElement("div");
panel.id = "biliResetPanel";
panel.innerHTML = `
<span id="biliResetPanelClose" title="关闭设置面板">×</span>
<label>
<input type="checkbox" id="biliResetSwitch">
启用自动重置进度到0秒
</label>
`;
document.body.appendChild(panel);
// Show/hide button
const btn = document.createElement("div");
btn.id = "biliResetPanelBtn";
btn.title = "打开【重置到0秒】设置";
btn.textContent = "↩₀"; // Use a more symbolic icon
document.body.appendChild(btn);
const switchCheckbox = document.getElementById('biliResetSwitch');
const closeButton = document.getElementById("biliResetPanelClose");
btn.onclick = (e) => {
e.stopPropagation(); // Prevent event bubbling
panel.style.display = panel.style.display === "block" ? "none" : "block";
}
closeButton.onclick = (e) => {
e.stopPropagation();
panel.style.display = "none";
}
// Close panel when clicking outside
document.addEventListener('click', (e) => {
// Check if panel and button exist and panel is visible
if (panel && btn && panel.style.display === 'block' && !panel.contains(e.target) && !btn.contains(e.target)) {
panel.style.display = 'none';
}
});
if (switchCheckbox) { // Check if element exists before accessing properties
switchCheckbox.checked = getEnabled();
switchCheckbox.onchange = (e) => {
setEnabled(e.target.checked);
};
} else {
console.error("[B站重置进度脚本] Checkbox 'biliResetSwitch' not found.");
}
};
addPanelElements(); // Call function to add elements
}
// Core function: add reset logic to video elements
function setupVideoReset(videoElement) {
if (!videoElement) return; // Guard clause
// Define event handler function
const onLoadedMetadata = () => {
if (getEnabled()) {
// Check if current time is not 0 to avoid unnecessary operations
if (videoElement.currentTime > 0) {
console.log(`[B站重置进度脚本] Detected video metadata loaded (Current time: ${videoElement.currentTime}), preparing to reset to 0s.`);
videoElement.currentTime = 0;
console.log("[B站重置进度脚本] Video progress reset to 0s.");
// Note: No need to manually play() or pause(), the Bilibili player will handle playback state
} else {
// console.log("[B站重置进度脚本] Video metadata loaded, current time is already 0, no reset needed.");
}
}
};
// Add a one-time 'loadedmetadata' event listener
videoElement.addEventListener('loadedmetadata', onLoadedMetadata, { once: true });
console.log("[B站重置进度脚本] Added 'loadedmetadata' listener to video element.");
// (Optional) Add error handling or listener removal logic just in case
videoElement.addEventListener('error', () => {
console.warn("[B站重置进度脚本] Video loading error, removing listener.");
// Attempt to remove the listener if it hasn't fired yet
try {
videoElement.removeEventListener('loadedmetadata', onLoadedMetadata);
} catch(e) {/* ignore */}
}, { once: true });
}
// Use MutationObserver to listen for DOM changes and catch dynamically loaded <video> elements
function observeDOMForVideo() {
const observer = new MutationObserver((mutationsList) => {
for (const mutation of mutationsList) {
if (mutation.type === 'childList') {
mutation.addedNodes.forEach(node => {
// Ensure it's an element node
if (node.nodeType === Node.ELEMENT_NODE) {
let videoElement = null;
// Check if the added node itself is a video
if (node.tagName === 'VIDEO') {
console.log("[B站重置进度脚本] Detected <video> element added directly to DOM.");
videoElement = node;
}
// Check if the added node contains a video element (more common)
else if (typeof node.querySelector === 'function') { // Check if querySelector exists
videoElement = node.querySelector('video');
if (videoElement) {
console.log("[B站重置进度脚本] Detected <video> element added within a child node.");
}
}
if (videoElement) {
setupVideoReset(videoElement);
// Consider disconnecting observer if only one main video expected, for performance.
// observer.disconnect();
}
}
});
}
}
});
// Configuration for the observer: watch for child node additions/removals in the entire subtree
const config = { childList: true, subtree: true };
// Start observing the target node (document.body is usually sufficient)
// Ensure body exists before observing
const startObserving = () => {
if (document.body) {
observer.observe(document.body, config);
console.log("[B站重置进度脚本] Started listening for DOM changes to find <video> elements.");
// Also, check if a video element already exists on page load (for non-dynamic loading)
const existingVideo = document.querySelector("video");
if (existingVideo) {
console.log("[B站重置进度脚本] Detected existing <video> element on page load.");
setupVideoReset(existingVideo);
} else {
// console.log("[B站重置进度脚本] No <video> element found on page load, waiting for DOM changes...");
}
} else {
setTimeout(startObserving, 50); // Wait if body not ready
}
};
startObserving();
// Return the observer instance in case you need to disconnect it later
return observer;
}
// Initialization
try {
createSettingsPanel(); // Create settings UI
observeDOMForVideo(); // Start listening for video elements
} catch (error) {
console.error("[B站重置进度脚本] Error during initialization:", error);
}
})();
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