獲取影片封面！
目前為
// ==UserScript==
// @name Youtube 封面
// @name:en Youtube Cover
// @name:zh-CN youtube 封面
// @namespace http://tampermonkey.net/
// @version 1.0.3
// @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==
console.log("youtube Cover is loading");
(async () => // onStart
{
let tryTimes = 0;
while(true)
{
console.log("try load");
if(document.querySelector("#start")!=null)
{
load();
return;
}
if(tryTimes>10) return;
tryTimes++;
await delay(300);
}
})();
function delay(ms = 0){return new Promise((r)=>{setTimeout(r, ms)})}
function getXY(element)
{
var x = 0, y = 0;
while (element)
{
x += element.offsetLeft - element.scrollLeft + element.clientLeft;
y += element.offsetTop - element.scrollLeft + element.clientTop;
element = element.offsetParent;
}
return {X: x, Y: y}
}
function checkImg(imgUrl)
{
return new Promise(function(resolve)
{
var img = new Image();
img.src = imgUrl;
img.onload = () => {resolve(img);}
})
}
function load()
{
var div = document.createElement("div");
div.innerHTML =`
<!-- css -->
<style>
#ytCover {
text-decoration: none;
font-size: 2em;
font-weight: bolder;
font-family: Roboto, Arial, sans-serif;
color: var(--yt-spec-text-primary);
}
div.list {
background-color: var(--yt-spec-brand-background-primary);
border: 1px solid var(--yt-spec-10-percent-layer);
padding: 0.5em 0;
position: fixed;
z-index: 999;
max-height: 20em;
font-size: 10px
}
.linkBtn {
text-decoration: none;
}
.list-item {
text-align: center;
font-size: 1.5em;
color: var(--yt-spec-text-primary);
height: 2.5em;
line-height: 2.5em;
}
.list-item:hover {
background: #AAA;
box-shadow: 0 4px 5px rgba(0, 0, 0, 0.2);
}
.slide {
cursor: default
}
</style>
<!-- html -->
<div>
<div class="slide" id="ytCover"></div>
<div class="list" id="ytListHead" style="border-top: none; top: 4.8em; left: 19em; width: 9.6em" hidden>
<div class="list-item slide" tag="maxres">1280x720+
<div class="list" style="border-left: none; width: 11.5em" hidden>
<a class="linkBtn" imgTag="maxresdefault"><div class="list-item">maxresdefault</div></a>
<a class="linkBtn" imgTag="maxres1"><div class="list-item">maxres1</div></a>
<a class="linkBtn" imgTag="maxres2"><div class="list-item">maxres2</div></a>
<a class="linkBtn" imgTag="maxres3"><div class="list-item">maxres3</div></a>
</div>
</div>
<div class="list-item slide" tag="sd">640x480
<div class="list" style="border-left: none; width: 8.5em" hidden>
<a class="linkBtn" imgTag="sddefault"><div class="list-item">sddefault</div></a>
<a class="linkBtn" imgTag="sd1"><div class="list-item">sd1</div></a>
<a class="linkBtn" imgTag="sd2"><div class="list-item">sd2</div></a>
<a class="linkBtn" imgTag="sd3"><div class="list-item">sd3</div></a>
</div>
</div>
<div class="list-item slide" tag="hq">480x360
<div class="list" style="border-left: none; width: 8.5em" hidden>
<a class="linkBtn" imgTag="hqdefault"><div class="list-item">hqdefault</div></a>
<a class="linkBtn" imgTag="hq1"><div class="list-item">hq1</div></a>
<a class="linkBtn" imgTag="hq2"><div class="list-item">hq2</div></a>
<a class="linkBtn" imgTag="hq3"><div class="list-item">hq3</div></a>
</div>
</div>
<div class="list-item slide" tag="mq">320x180
<div class="list" style="border-left: none; width: 8.5em" hidden>
<a class="linkBtn" imgTag="mqdefault"><div class="list-item">mqdefault</div></a>
<a class="linkBtn" imgTag="mq1"><div class="list-item">mq1</div></a>
<a class="linkBtn" imgTag="mq2"><div class="list-item">mq2</div></a>
<a class="linkBtn" imgTag="mq3"><div class="list-item">mq3</div></a>
</div>
</div>
<div class="list-item slide" tag="skip">120x90
<div class="list" style="border-left: none; width: 6.5em" hidden>
<a class="linkBtn" imgTag="default"><div class="list-item">default</div></a>
<a class="linkBtn" imgTag="1"><div class="list-item">1</div></a>
<a class="linkBtn" imgTag="2"><div class="list-item">2</div></a>
<a class="linkBtn" imgTag="3"><div class="list-item">3</div></a>
</div>
</div>
</div>
</div>`
document.querySelector("#start").append(div);
var ytC = document.querySelector("#ytCover");
var ytLH = document.querySelector("#ytListHead");
document.querySelectorAll(".linkBtn").forEach((e)=>{e.target="_blank"});
ytC.innerText = document.querySelector("html").lang.indexOf("zh")!=-1?"封面":"Cover";;
window.onresize = () => {ytLH.style.left = (getXY(ytC).X/10-1)+"em";}
document.querySelectorAll(".list > .slide").forEach((e)=>
{
let list = e.querySelector(".list");
e.onmouseenter = () =>
{
list.style.top = (getXY(e).Y/10-0.5)+"em";
list.style.left = parseFloat(ytLH.style.left) + 9.7 + "em";
list.hidden = false;
};
e.onmouseleave = () => {list.hidden = true;}
})
var hide;
ytC.onmouseenter = () =>
{
hide = false;
ytLH.hidden = false;
};
ytC.onmouseleave = async () =>
{
hide = true;
await delay(500);
ytLH.hidden = hide;
};
ytLH.onmouseenter = () =>
{
hide = false;
};
ytLH.onmouseleave = async () =>
{
hide = true;
await delay(200);
ytLH.hidden = hide;
};
var oldHref = null
new MutationObserver(() => // onUrlChange
{
if (oldHref != document.location.href)
{
oldHref = document.location.href
let video_id = null;
window.location.search.replace("?","").split('&').forEach((s)=>{if(s.startsWith("v=")){video_id=s.replace("v=","")};});
ytC.hidden = (video_id == null);
if (video_id == null) return;
document.querySelectorAll(".list > .slide").forEach(async (e)=>
{
if (e.getAttribute("tag")=="skip") return;
let url = "https://i.ytimg.com/vi/" + video_id + "/" + e.getAttribute("tag") + "default.jpg";
checkImg(url).then((img)=>{e.hidden=!(img.width>120 && img.height>90);});
});
let Btns = document.querySelectorAll(".linkBtn");
Btns.forEach((e)=>{e.href = "https://i.ytimg.com/vi/" + video_id + "/" + e.getAttribute("imgTag") + ".jpg";});
checkImg("https://i.ytimg.com/vi/" + video_id + "/mq1.jpg").then((img)=>
{
if(img.width<=120 && img.height<=90)
{Btns.forEach((e)=>{e.hidden=(e.getAttribute("imgTag").indexOf("default")==-1);});}
else
{Btns.forEach((e)=>{e.hidden=false});}
});
}
}).observe(document.body, {childList: true, subtree: true});
console.log("done");
}
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