通过配置文件控制HTTP的"Expires"和"Cache-Control"头内容，达到缓存静态资源的目的。

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<IfModule mod_expires.c>
    ExpiresActive On
    Header unset ETag
    FileETag None
    #[access|now (等价于'access')|modification] [plus| ] [n] [years|months|weeks|days|hours|minutes|seconds] 
    ExpiresDefault "access plus 1 month"
    ExpiresByType image/x-icon "access plus 1 month"
    ExpiresByType application/x-javascript "access plus 1 weeks"
    ExpiresByType text/css "access plus 3 days"
    ExpiresByType image/gif "access plus 1 month"
    ExpiresByType image/png "access plus 1 month"
    ExpiresByType image/jpeg "access plus 1 month"
    ExpiresByType text/plain "access plus 1 weeks"
    ExpiresByType application/x-shockwave-flash "access plus 1 month"
    ExpiresByType video/x-flv "access plus 1 month"
    ExpiresByType application/pdf "access plus 1 month"
    ExpiresByType text/html "access plus 1 weeks"
    #客户端GIF有效期为1个月
    ExpiresByType image/gif A2592000
    #HTML文档的有效期是最后修改时刻后的一星期
    ExpiresByType text/html M604800
</IfModule>