Replace Missing Favicon

Add default favicon for any sites that don't have a favicon
当前为 2017-05-11 提交的版本，查看最新版本。
换行
// ==UserScript==
// @name        Replace Missing Favicon
// @namespace   iFantz7E.ReplaceMissingFavicon
// @description Add default favicon for any sites that don't have a favicon
// @version     0.10
// @icon        http://i.imgur.com/AI5VsOE.png
// @include     *
// @run-at      document-start
// @grant       GM_xmlhttpRequest
// @connect     self
// @copyright   2017, 7-elephant
// ==/UserScript==

(function ()
{
	"use strict";
	// jshint multistr:true

function attachOnReady(callback) 
{
	document.addEventListener("DOMContentLoaded", function (e) 
	{
		callback();
	});
}

function getFavicon()
{
    var favicon = null;
    var elesLink = document.querySelectorAll("link");
    for (var i = 0; i < elesLink.length; i++)
    {
		var attrRel = elesLink[i].getAttribute("rel");
        if((attrRel === "icon") || (attrRel == "shortcut icon"))
        {
            favicon = elesLink[i].getAttribute("href");
			break;
        }
    }
    return favicon;        
}

function main() 
{	
	// Default icon from https://s2.googleusercontent.com/s2/favicons?domain=sample
	var iconDefault = "data:image/png;base64,\
iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAABs0lEQVR4AWL4//8/RRjO8Iucx+noO0O2qmlbUEnt5r3Juas+\
hsQD6KaG7dqCKPgx72Pe9GIY27btZBrbtm3btm0nO12D7tVXe63jqtqqU/iDw9K58sEruKkngH0DBljOE+T/qqx/Ln718RZO\
Fasxyd3XRbWzlFMxRbgOTx9QWFzHtZlD+aqLb108sOAIAai6+NbHW7lUHaZkDFJt+wp1DG7R1d0b7Z88EOL08oXwjokcOvvU\
xYMjBFCamWP5KjKBjKOpZx2HEPj+Ieod26U+dpg6lK2CIwTQH0oECGT5eHj+IgSueJ5fPaPg6PZrz6DGHiGAISE7QPrIvIKV\
rSvCe2DNHSsehIDatOBna/+OEOgTQE6WAy1AAFiVcf6PhgCGxEvlA9QngLlAQCkLsNWhBZIDz/zg4ggmjHfYxoPGEMPZECW+\
zjwmFk6Ih194y7VHYGOPvEYlTAJlQwI4MEhgTOzZGiNalRpGgsOYFw5lEfTKybgfBtmuTNdI3MrOTAQmYf/DNcAwDeycVjRO\
gZFt18gMso6V5Z8JpcEk2LPKpOAH0/4bKMCAYnuqm7cHOGHJTBRhAEJN9d/t5zCxAAAAAElFTkSuQmCC";
	
	if (!getFavicon())
	{
		GM_xmlhttpRequest(
		{
			url: "/favicon.ico",
			method: "HEAD",
			onload: function(response)
			{
				if (response.status !== 200)
				{
					//console.log("Favicon: Not found");
					
					var ele = document.createElement("link");
					ele.setAttribute("rel", "icon");
					ele.setAttribute("type", "image/png");
					ele.setAttribute("href", iconDefault);
					
					document.head.appendChild(ele);
				}
			}
		});
	}
}

attachOnReady(main);
	
})();

// End