URL versioning of images inside css for cache busting

Question

I have a requirement in my project to version image files which are called from css. I have been researching on 'how to' and found our very own stackoverflow.com is versioning images. I found below code from http://cdn.sstatic.net/stackoverflow/all.css

background-image:url("../Img/sprite-herobox.png?v=d173774f3a9f")

Can somebody tell me how it is done?

Answer 1

CSS文件可能不是静态文件，而是php / asp文件，仅带有（.css）扩展名和CSS代码