方法如下：

文章页面输入：

<script src="https://cdn.rawgit.com/google/code-prettify/master/loader/run_prettify.js?lang=css&amp;skin=sunburst"></script>

引用代码格式：<pre class="prettyprint">引用代码</pre> 或 <code class="prettyprint">引用代码</code>

// ==UserScript==
// @name         Youtube Download MP4,3GP,MP3,AVI, 1080,720,480,360
// ==/UserScript==

(function() {
    'use strict';
    setInterval(function(){
        var urlact = window.location.href;
        console.log(urlact);
        if(/watch\?v=/i.test(urlact)){
            console.log('inicio');
            var codevi = urlact.split('v=');
            var codevi = codevi[1].split('&');
            var div = '

 

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