我需要检查目录是否存在，如果不存在，请回退到动态页面，发布等。
这很接近但不太正确，我一直得到 Wordpress 动态帖子，所以我的条件是错误的：
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index'.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond wp-content/wp_fast_cache/example.com/%{REQUEST_FILENAME} -d
RewriteRule ^([^?]*) wp-content/wp_fast_cache/example.com/$1 [L]
RewriteRule . /index.php [L]
</IfModule>
--编辑--
下面的代码现在查找静态缓存文件，但无法回退到已从缓存中删除的项的默认索引.php文件。
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{DOCUMENT_ROOT}/wp-content/wp_fast_cache/example.com%{REQUEST_URI} -d
RewriteRule ^([^?]*) wp-content/wp_fast_cache/example.com/$1 [L]
</IfModule>
我已经尝试了Wordpress htaccess中的默认值：
RewriteRule . /index.php [L]
但这会强制所有请求重写为索引.php而不是使用缓存。
你可能想要更多这样的东西：
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
# if the request is already "index.php" pass-through and stop rewriting
RewriteRule ^index'.php$ - [L]
# if the request exists in the fast cache, rewrite it to that
RewriteCond %{DOCUMENT_ROOT}/wp-content/wp_fast_cache/example.com%{REQUEST_URI} -d [OR]
RewriteCond %{DOCUMENT_ROOT}/wp-content/wp_fast_cache/example.com%{REQUEST_URI} -f
RewriteRule ^ wp-content/wp_fast_cache/example.com%{REQUEST_URI} [L]
# else, route through wordpress
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
这最终成为解决方案：
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index'.php$ - [L]
RewriteCond %{DOCUMENT_ROOT}/wp-content/wp_fast_cache/example.com%{REQUEST_URI}index.html -f
RewriteRule ^([^?]*) wp-content/wp_fast_cache/example.com/$1/index.html [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
非常接近Jon Lin提供的，谢谢你的帮助。