子域和文件夹
刚刚启动了一个网站，我在主域上有一个 /img 目录。我想设置一个能够使用 /img 文件夹的子域（其中文件夹只是主目录中的另一个文件夹），但它不起作用。
/img 和 /subdomain 文件夹位于同一级别，因此要显示主域中的图像，我键入： 
谁能告诉我如何实现这一目标？我不想将图像链接到他们的互联网目录（即http://www...），因为我想修改我计算机上的网站并通过 ftp 上传它们。
我确信这只是我搞砸了或者不完全理解的事情。提前致谢！
Just started a site and I have an /img directory on the main domain. I would like to set up a subdomain(where the file folder is just another one in the main directory) that is able to use the /img folder but it doesn't work.
The /img and /subdomain folders are on the same level, so to display images in the main domain I type: <img src="img/image.jpg">
and for the /subdomain I type: <img src="../img/image.jpg">
and I get a 404 error for the site: http://subdomain.example.com/img/image.jpg
As you can see, I want it to be linking to http://www.example.com/img/image.jpg
Can anyone tell me how to achieve this? I would prefer not to link images to their internet directory (i.e. http://www...) because I would like to modify the sites on my computer and upload them via ftp.
I'm sure it's just something that I am messing up or don't completely understand. Thanks in advance!
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相对路径始终相对于 URI。如果您的 http://subdomain.example.com/ 页面包含指向 ../ 的链接img/image.jpg，Web 服务器将其转换为 http:// 的链接subdomain.example.com/../img/image.jpg。显然，Web 服务器无法提供其根目录之上的任何内容（这就是拥有根目录的全部意义）。
您的网络服务器配置为仅提供 /subdomain 目录中的内容，但显然 /img 不在该目录内，因此无法提供服务。您需要做的是将您的网络服务器配置为在收到对 http://subdomain.example.com/img/
对于 Apache，这可以通过 mod_alias。
摘要：使用 mod_alias 将请求映射到 http://subdomain.example.com/img/ 到目录/img。
Relative paths are always relative to a URI. If you have a page at http://subdomain.example.com/ containing a link to ../img/image.jpg, the web server translates it into a link to http://subdomain.example.com/../img/image.jpg. Obviously the web server can't serve anything above it's root directory (that's the whole point of having a root).
Your webserver is configured to only serve content in the /subdomain directory, but obviously /img is not inside that directory, and can't thus be served. What you need to do is configure your webserver to look in /img (the directory on your filesystem) instead of /subdomain/img when it gets an request for any content at http://subdomain.example.com/img/
With Apache this can be done with mod_alias.
Summary: Use mod_alias to map requests to http://subdomain.example.com/img/ to the directory /img.