Youtube Simple URL, Visited and Blacklist

This script is designed to work only on Youtube Trending page. Script cuts the time parameter which is used to continue watching from last position, changes the color of visited links to aqua and most importantly lets you ignore channels on trending page.
目前为 2020-02-14 提交的版本。查看最新版本。
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// ==UserScript==
// @name         Youtube Simple URL, Visited and Blacklist
// @namespace    http://tampermonkey.net/
// @version      0.42
// @description  This script is designed to work only on Youtube Trending page. Script cuts the time parameter which is used to continue watching from last position, changes the color of visited links to aqua and most importantly lets you ignore channels on trending page.
// @author       taipignas
// @match        https://www.youtube.com/*
// @grant        none
// ==/UserScript==

(function () {
    'use strict';
    // run main function on initialization, not just on title change
    main();
    // setup title change listener
    var title = document.querySelector('title');
    const config = { attributes: true, childList: true, subtree: true, characterData: true };
    const callback = function (mutationsList, observer) {
        main();
        for (let mutation of mutationsList) {
            if (mutation.type === 'childList') {
                console.log('A child node has been added or removed.');
            }
            if (mutation.type === 'subtree') {
                console.log('A subtree');
            }
            if (mutation.type === 'characterData') {
                console.log('A characterData');
            }
            else if (mutation.type === 'attributes') {
                console.log('The ' + mutation.attributeName + ' attribute was modified.');
            }
        }
    };
    const observer = new MutationObserver(callback);
    observer.observe(title, config);

    // add channel or user id to localstorage ignorelist
    function ignore(e) {
        hideSingle(e);
        let ignoreList = [];
        ignoreList[0] = localStorage.getItem('ignoreList');
        ignoreList.push(e);
        localStorage.setItem('ignoreList', ignoreList);
        console.log(localStorage.getItem('ignoreList'));
    }

    // hide single video tile. used when clicking a button
    function hideSingle(e) {
        document.querySelector(`a[href$="${e}"]`).parentNode.parentNode.parentNode.parentNode.parentNode.parentNode.parentNode.parentNode.parentNode.parentNode.parentNode.style.display = "none";
    }

    // hide all video tiles matching id. used in main function to hide all ignored channel on initialization.
    function hideAll(e) {
        document.querySelectorAll(`a[href$="${e}"]`).forEach(element => { element.parentNode.parentNode.parentNode.parentNode.parentNode.parentNode.parentNode.style.display = "none" });
    }

    function ToggleBlacklistedVisability() {
        localStorage.getItem('ignoreListSetting') == 1 ? localStorage.setItem('ignoreListSetting', 0) : localStorage.setItem('ignoreListSetting', 1);
        window.location.reload();
        reload
        console.log(localStorage.getItem('ignoreListSetting'));
    }

    // main function
    function main() {
        if (window.location.href.includes('trending')) {
            // leave only simple video link with no properties like time to continue from
            document.querySelectorAll("a#video-title[href^='/watch?v=']").forEach(element => { element.href = element.href.slice(0, 43) });

            // query local storage ignorelist and hide all
            if (localStorage.getItem('ignoreListSetting') == 1 && localStorage.getItem('ignoreList') != null) {
                for (let channel of localStorage.getItem('ignoreList').split(',')) {
                    hideAll(channel);
                }
            }

            // query video tiles container and add each a button to send its channel id to ignore function
            var container = document.querySelectorAll("ytd-video-renderer");
            for (let tile of container) {
                let button = document.createElement(`button`);
                button.textContent = `ignore`;
                button.setAttribute(`style`, `position: absolute; right: 0;`);
                let url = tile.querySelector("a[href^='/user/']") ? tile.querySelector("a[href^='/user/']") : tile.querySelector("a[href^='/channel/']");
                let username = url.href;
                username = username.slice(username.lastIndexOf('/') + 1);
                button.value = username;
                button.onclick = function () { ignore(this.value) };
                tile.firstElementChild.appendChild(button);
            }

            let ignoreListSetting = localStorage.getItem('ignoreListSetting');
            let button = document.createElement(`button`);
            button.textContent = (ignoreListSetting == 1 ? `show` : `hide`) + ` ignored channels`;
            // (ignoreListSetting=="1"? `show` : `hide`) +
            // button.setAttribute(`style`, `position: absolute; right: 0;`);
            button.onclick = function () { ToggleBlacklistedVisability() };
            document.querySelector("ytd-video-renderer").parentNode.prepend(button);

            // css code to change style color of visited links
            var style = document.createElement('style');
            style.innerHTML = `a#video-title:visited {color:aqua  !important;}`;
            document.head.appendChild(style);
        };
    };
})();
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