每个人都知道如何在HTML中设置favicon.ico链接:
<link rel="shortcut icon" href="http://hi.org/icon.ico" type="image/x-icon">
但是对于一个只有几个字节的小图标，我们需要另一个可能会降低速度的HTTP请求，这是愚蠢的。
所以我想知道，我怎么能让favicon的一部分可用的精灵(例如，background-position=0px -200px;)，可以作为一个logo在网站的其余部分，以加快网站的速度，并节省宝贵的和宝贵的HTTP请求。我们如何将其与我们的标志和其他艺术品一起放入现有的精灵图像中?
当前回答
对@yc的回答的一个小改进是从通常使用和缓存的JavaScript文件中注入base64编码的favicon，并通过在相关元标记中提供数据URI来抑制请求favicon.ico的标准浏览器行为。
这项技术避免了额外的http请求，并且被证实适用于Windows 7上最新版本的Chrome、Firefox和Opera。然而，至少在ie9中它似乎不能工作。
文件index . html
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<!-- Suppress browser request for favicon.ico -->
<link rel="shortcut icon"type="image/x-icon" href="data:image/x-icon;,">
<script src="script.js"></script>
...
文件script.js
var favIcon = "\
iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAABrUlEQVR42mNkwAOepOgxMTD9mwhk\
[...truncated for brevity...]
IALgNIBUQBUDAFi2whGNUZ3eAAAAAElFTkSuQmCC";
var docHead = document.getElementsByTagName('head')[0];
var newLink = document.createElement('link');
newLink.rel = 'shortcut icon';
newLink.href = 'data:image/png;base64,'+favIcon;
docHead.appendChild(newLink);
/* Other JavaScript code would normally be in here too. */
演示:turi.co / / favicon.html
其他回答
很抱歉，您不能将favicon与其他资源合并。
这意味着你基本上有两个选择:
If you're comfortable with your site not having a favicon - you can just have the href point to a non-icon resource that is already being loaded (e.g., a style sheet, script file, or even some resource that benefits from being pre-fetched). (My brief testing indicates that this works across most, if not all, major browsers.) Accept the extra HTTP request and just make sure your favicon file has aggressive HTTP cache-control headers set. (If you have other websites under your control, you might even have them sneakily preload the favicon for this website - along with other static resources.)
附注:行不通的创造性解决方案:
奇怪的CSS数据URI技巧(由评论者Felix Geenen链接)不起作用。 使用JavaScript执行favicon <link>元素的延迟注入(由用户yc建议)可能只会让事情变得更糟——导致两个HTTP请求。
这真的重要吗?
许多浏览器以低优先级加载favicon，这样它就不会阻塞页面加载，所以是的，这是一个额外的请求，但它不在任何关键路径上。
JavaScript解决方案很糟糕，因为JavaScript代码已经被检索和执行，下面所有的DOM元素将被阻止呈现，并且它不会减少请求的数量!
这是最简单的方法:
<!DOCTYPE html><html><head>
<link rel="shortcut icon" href="data:image/png;base64,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9qX75QgM/jhb/ZB5KtlRk1CdDM2+k0SKLn6SM4KBoXRHhsOY6J2XmsbWxgdv42Jqdn
cH3sJo4c7sKhg50oFku4s7yMuYUleJqahEizzDm7pCoBgt8XH7/Q8wzOvPmamLtz1w
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bh/GcfY39Hu2RYJYkKAvR9KBjAjZv/CJHMThQ37gYS066IhMNgWmpSZtIVBHio2euV
AhLH+OSU2qsFmQ828jx69Rpi8VX4vJX9YgUBCmbBCIsVhv8cQTKVKt/jDsFIYvpjJ0
RLUuPYygqujF5FG3tEo7IkOxKgUObwvcR9DF2+omRTmE5NDco5/dFzSoGd4sWaMvjL
kCJZJQmsV7FZC9bziBSQv2+M4Y+RUbWki5IGZXPC1oy/eo4buY9W/PnX3zC/uFTuEa
VJcRoV1dC8iSRawyFcGv4dqe1tvHrqpFS1EFbX1zE+dQvT0hVlpNSyzvc+exR9zz8n
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7+5SRKAAAAAElFTkSuQmCC">
</head></html>
它代表什么图标?回答下面!
好观点，好想法，但不可能。favicon需要是一个单独的、独立的资源。没有办法将它与另一个图像文件合并。
正确的解决方案是使用HTTP管道。
HTTP管道是一种将多个HTTP请求写入到单个套接字而不等待相应响应的技术。只有HTTP/1.1支持管道，1.0中不支持。
它要求服务器支持它，但不一定参与其中。
HTTP管道需要客户端和服务器都支持它。符合HTTP/1.1的服务器需要支持流水线。这并不是说服务器必须通过管道处理响应，而是说如果客户端选择通过管道处理请求，服务器必须不会失败。
许多浏览器客户端在应该这样做的时候却没有这样做。
HTTP pipelining is disabled in most browsers. Opera has pipelining enabled by default. It uses heuristics to control the level of pipelining employed depending on the connected server. Internet Explorer 8 does not pipeline requests, due to concerns regarding buggy proxies and head-of-line blocking. Mozilla browsers (such as Mozilla Firefox, SeaMonkey and Camino), support pipelining however it is disabled by default. It uses some heuristics, especially to turn pipelining off for IIS servers. Konqueror 2.0 supports pipelining, but it's disabled by default.[citation needed] Google Chrome does not support pipelining.
我建议你尝试在Firefox中启用管道，或者直接使用Opera(不寒而栗)。
