如何使用htaccess文件添加静态内容过期

htaccess file content. I want to set expiration of my static contents like images, js, css

RewriteEngine On
RewriteCond $1 !^(index\.php|images|css|js|robots\.txt|favicon\.ico)
RewriteCond %{REQUEST_URI} ^/system.*
RewriteRule ^(.*)$ index.php?/$1 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.+)$ index.php?/$1 [L]

My images location is

www.sitename.com/css/css/css files
www.sitename.com/images/img/images

like this

How about something like

<Directory "css/">
    ExpiresDefault A0
    Header set Cache-Control "max-age=0,  no-cache, must-revalidate"
</Directory>

Where 0 is the time it expires in seconds.

Check mod_expires documentation.

You can use something like

<FilesMatch "\.(ico|jpg|jpeg|png|gif|js|css|swf)$">
ExpiresDefault "access plus 12 hours"
</FilesMatch>