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获取视频封面！
当前为
// ==UserScript==
// @name Youtube 封面
// @name:en Youtube Cover
// @name:zh-CN youtube 封面
// @namespace http://tampermonkey.net/
// @version 0.1.5
// @description 獲取影片封面！
// @description:en Get the cover of youtube video！
// @description:zh-CN 获取视频封面！
// @author Anong0u0
// @include *//www.youtube.com/*
// @grant none
// ==/UserScript==
async function sleep(ms = 0) {return new Promise(r => setTimeout(r, ms));}
window.addEventListener("load",async () =>
{
await sleep(300);
var elink = document.createElement("link");
elink.rel = "stylesheet";
elink.href = "https://cdn.jsdelivr.net/gh/chiron-fonts/[email protected]/build/webfont/css/Medium.css";
var ea = document.createElement("a");
ea.text = document.querySelector("html").lang.indexOf("zh")!=-1?"封面":"Cover";
ea.id = "ytCover";
ea.target = "_blank";
ea.hidden = true;
ea.style = 'text-decoration:none;font-size: 2em;font-family: "Chiron Sans HK WS";';
document.querySelector("#start").append(elink);
document.querySelector("#start").append(ea);
var ytC = document.querySelector("#ytCover");
var mas = document.querySelector("#masthead");
var title = document.querySelector("title");
ytC.style.color = mas.dark? "white":"black";
var oldHref = null
var urlChange = new MutationObserver((mutations) =>
{
if (oldHref != document.location.href)
{
oldHref = document.location.href
var video_id = null;
window.location.search.replace("?","").split('&').forEach((s)=>{if(s.startsWith("v=")){video_id=s.replace("v=","")};});
ytC.hidden = (video_id == null);
ytC.href = "https://i.ytimg.com/vi/" + video_id + "/maxresdefault.jpg";
}
});
var darkMode = new MutationObserver((mutations) => {ytC.style.color = mas.dark? "white":"black"});
urlChange.observe(title, {childList: true});
darkMode.observe(mas, {attributes: true});
});