这个图片地址是怎么回事,是真实的地址么?用了伪静态么?
看下这两个URL:
http://img.yzcdn.cn/upload_files/2015/08/26/14405577348089273.jpg
http://img.yzcdn.cn/upload_files/2015/08/26/14405577348089273.jpg?imageView/2/w/100/h/100/q/75/format/webp
上面的明显是一个图片的绝对地址啊,也就是图片在空间的真实路径吧,为什么第二张图片在后面加参数:?imageView/2/w/100/h/100/q/75/format/webp 就能输出小图了呢?
难道上面那个不是真实的图片地址,不然怎么能够带参数呢,这个是怎么做到的呢,
对真实的图片路径概念比较模糊,很郁闷了。
希望有大神解释一下,感激不敬!
回复内容:
看下这两个URL:
http://img.yzcdn.cn/upload_files/2015/08/26/14405577348089273.jpg
http://img.yzcdn.cn/upload_files/2015/08/26/14405577348089273.jpg?imageView/2/w/100/h/100/q/75/format/webp
上面的明显是一个图片的绝对地址啊,也就是图片在空间的真实路径吧,为什么第二张图片在后面加参数:?imageView/2/w/100/h/100/q/75/format/webp 就能输出小图了呢?
难道上面那个不是真实的图片地址,不然怎么能够带参数呢,这个是怎么做到的呢,
对真实的图片路径概念比较模糊,很郁闷了。
希望有大神解释一下,感激不敬!
因为是用php动态处理的
?后的参数表示图片的参数
image只是表示路径
URL的路径也就仅仅是路径,跟本地文件路径的概念不实完全样的。
比如你用服务器做一个API接口,假设接口URL(A
)的路径是 http://img.yzcdn.cn/user/list , 并切你实现了这个接口的请求。那就可以获取到数据。
URL A
指向的也不是一个文件啊,但是成功返回数据了。假设你把返回的数据换成一个图片文件,那 http://img.yzcdn.cn/user/list 这样的URL,就可以获取到图片文件。
URL地址只是一个标识符,这个标识符通常的情况下,可以跟网站目录下的文件对应。但是如果你不希望它直接对应到网站的文件也是可以的。
你上面提到的 http://img.yzcdn.cn/upload_files/2015/08/26/14405577348089273.jpg ,甚至可能文件根本不是保存在 网站根目录/upload_files/2015/08/26/14405577348089273.jpg
目录下。服务器实现的时候,只是根据URL路径和参数去决定返回大图还是小图罢了。

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