Youtube: 觀看5分鐘影片後自動按喜歡

Youtube-觀看5分鐘影片後自動按喜歡.user.js

// ==UserScript==
// @name                Youtube: Automatically press like after watching 5 minutes of video
// @name:zh             Youtube: 觀看5分鐘影片後自動按喜歡
// @version             1.1.2
// @description         Youtube: Automatically press like after watching 5 minutes of video
// @author              琳(jim60105)
// @match               https://www.youtube.com/*
// @icon                https://www.google.com/s2/favicons?sz=64&domain=youtube.com
// ==/UserScript==

(function () {
    'use strict';

    /**
     * @type {number} waitForSeconds - The number of seconds to wait before pressing the button.
     */
    const waitForSeconds = 5 * 60;

    /////////////////////////// DO NOT TOUCH ANYTHING BELOW THIS LINE ///////////////////////////
    let timeout;

    window.addEventListener('load', function () {
        // Youtube doesn't refresh the page when you switch videos within the site.
        DoWhenUrlChange(function () {
            if (!CheckUrl()) return;
            WaitAndPressTheButton();
        });
    });

    function DoWhenUrlChange(func) {
        // Youtube refreshes this element when you click on a link between homepage and video page.
        const headerElement = document.getElementById('masthead');
        // Youtube refreshes this element when you click on a link and jump BETWEEN video pages.
        let videoElement;
        // Init with empty string so that the first time the page loads, the function will be executed.
        let previousUrl = '';

        const config = { attributes: true, childList: false, characterData: false };
        const observer = new MutationObserver(function (mutations) {
            if (location.href !== previousUrl) {
                previousUrl = location.href;
                // console.log(`URL changed to ${location.href}`);
                func();

                // The video element is not available when entering from the home page.
                if (!videoElement) {
                    videoElement = document.getElementsByTagName('video')[0];
                    if (videoElement) {
                        observer.observe(videoElement, config);
                    }
                }
            }
        });

        if (headerElement) observer.observe(headerElement, config);
    }

    function CheckUrl() {
        return window.location.pathname.match('^/watch');
    }

    function WaitAndPressTheButton() {
        console.log(`Automatically press like button after waiting ${waitForSeconds} seconds...`);
        clearTimeout(timeout);
        timeout = setTimeout(function () {
            const button = document
                .getElementById('segmented-like-button')
                .getElementsByTagName('button')[0];

            if (button.getAttribute('aria-pressed') === 'true') return;

            button.click();
            console.log('Automatically liked this video!');
        }, waitForSeconds * 1000);
    }
})();