// ==UserScript==
// @name         网页加速器
// @namespace    http://tampermonkey.net/
// @version      1.0.0
// @description  自定义倍速加速任意网页
// @author       yhu
// @match        *://*/*
// @grant        none
// @license MIT
// ==/UserScript==

(function() {
    'use strict';

    let speed = 1.0;

    const button = document.createElement('div');
    button.style.position = 'fixed';
    button.style.bottom = '20px';
    button.style.right = '20px';
    button.style.width = '50px';
    button.style.height = '50px';
    button.style.borderRadius = '50%';
    button.style.backgroundColor = '#2196F3';
    button.style.color = 'white';
    button.style.textAlign = 'center';
    button.style.lineHeight = '50px';
    button.style.fontSize = '16px';
    button.style.fontWeight = 'bold';
    button.style.cursor = 'pointer';
    button.style.zIndex = '999999';
    button.style.boxShadow = '0 2px 10px rgba(0,0,0,0.3)';
    button.style.userSelect = 'none';
    button.textContent = '1.0x';
    document.body.appendChild(button);

    button.addEventListener('click', function() {
        const input = prompt('请输入播放速度（例如：1.5、2.0、0.5）:', speed);
        if (input === null) return;
        const newSpeed = parseFloat(input);
        if (isNaN(newSpeed) || newSpeed <= 0) {
            alert('请输入有效的正数！');
            return;
        }
        speed = newSpeed;
        button.textContent = speed.toFixed(1) + 'x';
        applySpeed(speed);
    });

    function applySpeed(speed) {
        document.querySelectorAll('video, audio').forEach(element => {
            element.playbackRate = speed;
        });
    }

    const observer = new MutationObserver(function() {
        applySpeed(speed);
    });
    observer.observe(document.body, {
        childList: true,
        subtree: true
    });

    setInterval(function() {
        applySpeed(speed);
    }, 2000);

    applySpeed(speed);
})();