前提知识：油猴脚本的用法

用法

数字键 1-9 对应视频进度 10%-90%，预览视频时再也不用鼠标移动到进度条后拖放了。

左右箭头快进，快进 60s，快退30s。

上下箭头调节播放速度。

// ==UserScript==
// @name         Video Progress Controller
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Control video progress and speed with keyboard shortcuts
// @author       You
// @match        *://*/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    document.addEventListener('keydown', function(e) {
        const video = document.querySelector('video');
        if (!video) return;

        switch (e.key) {
            case '1': case '2': case '3': case '4': case '5':
            case '6': case '7': case '8': case '9':
                video.currentTime = video.duration * (Number(e.key) * 0.1);
                break;
            case 'ArrowRight':
                video.currentTime += 60;
                break;
            case 'ArrowLeft':
                video.currentTime -= 30;
                break;
            case '+':
                video.playbackRate += 0.15;
                showFloatMessage(`Speed: ${video.playbackRate.toFixed(2)}x`);
                break;
            case '-':
                if (video.playbackRate > 0.15) {
                    video.playbackRate -= 0.15;
                    showFloatMessage(`Speed: ${video.playbackRate.toFixed(2)}x`);
                }
                break;
            case '0':
                video.playbackRate = 1.0;
                video.play();
                showFloatMessage('Speed: 1.00x');
                break;
        }
    });

    function showFloatMessage(message) {
        const floatMessage = document.createElement('div');
        floatMessage.innerText = message;
        floatMessage.style.position = 'fixed';
        floatMessage.style.bottom = '20px';
        floatMessage.style.right = '20px';
        floatMessage.style.padding = '10px';
        floatMessage.style.backgroundColor = 'rgba(0, 0, 0, 0.75)';
        floatMessage.style.color = 'white';
        floatMessage.style.borderRadius = '5px';
        floatMessage.style.zIndex = '9999';
        document.body.appendChild(floatMessage);
        setTimeout(() => {
            floatMessage.remove();
        }, 2000);
    }
})();