Auto Scroll with Countdown

Automatically scrolls down the page with a visible countdown timer.
当前为 2025-06-14 提交的版本，查看最新版本。
换行
// ==UserScript==
// @name         Auto Scroll with Countdown
// @description  Automatically scrolls down the page with a visible countdown timer.
// @match        *://*/*
// @version 0.0.1.20250614104400
// @namespace https://gf.qytechs.cn/users/1435046
// ==/UserScript==

(function() {
    'use strict';

    const scrollSpeed = 1; // pixels per frame
    const frameInterval = 16; // ms (approx 60fps)

    let scrollInterval;
    let totalScrollDistance;
    let estimatedTime;
    let remainingTime;
    let timerDiv;

    function createTimerDisplay() {
        timerDiv = document.createElement('div');
        Object.assign(timerDiv.style, {
            position: 'fixed',
            top: '10px',
            right: '10px',
            backgroundColor: 'rgba(0, 0, 0, 0.75)',
            color: '#fff',
            padding: '6px 10px',
            borderRadius: '6px',
            fontFamily: 'monospace',
            fontSize: '14px',
            zIndex: '999999'
        });
        document.body.appendChild(timerDiv);
    }

    function updateTimerDisplay(seconds) {
        const mins = Math.floor(seconds / 60);
        const secs = Math.floor(seconds % 60);
        timerDiv.textContent = `${String(mins).padStart(2, '0')}:${String(secs).padStart(2, '0')}`;
    }

    function startAutoScroll() {
        totalScrollDistance = document.documentElement.scrollHeight - window.innerHeight;
        const remainingDistance = totalScrollDistance - window.scrollY;
        estimatedTime = remainingDistance / scrollSpeed * (frameInterval / 1000); // in seconds
        remainingTime = estimatedTime;

        scrollInterval = setInterval(() => {
            const currentScroll = window.scrollY;
            const maxScroll = document.documentElement.scrollHeight - window.innerHeight;

            if (currentScroll >= maxScroll) {
                clearInterval(scrollInterval);
                updateTimerDisplay(0);
                return;
            }

            window.scrollBy(0, scrollSpeed);
            remainingTime -= frameInterval / 1000;
            updateTimerDisplay(remainingTime);
        }, frameInterval);
    }

    createTimerDisplay();
    startAutoScroll();
})();
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