大跌眼镜哉，,htacess怎么重写都无效~~
http.ini的没问题，

[ISAPI_Rewrite]

# 3600 = 1 hour
CacheClockRate 3600

RepeatLimit 32

# Protect httpd.ini and httpd.parse.errors files
# from accessing through HTTP

# duoduo Rewrite规则

RewriteCond Host: (.*)stu80\.com$
RewriteRule (.*) http\://www\.youyax\.com [R,I]

RewriteCond Host: ^www\.stu80\.com$
RewriteRule (.*) http\://www\.youyax\.com [R,I]

RewriteCond Host: ^youyax\.com$
RewriteRule (.*) http\://www\.youyax\.com [R,I]

RewriteRule ^/forum/((Index|List|Content|admin|Vote|Message|Favor).*)$ /forum/index\.php/$1 [L]
RewriteRule ^/m/((Index|List|Content|admin|Vote|Message|Favor).*)$ /m/index\.php/$1 [L]

由于西部数码的主机很贵240元，所以换空间了，改用70元的linux主机

RewriteEngine On

#rewriteCond %{http_host} ^stu80\.com [NC]
#rewriteRule ^(.*)$ http://www\.youyax\.com/$1 [R=301,L]

#rewriteCond %{http_host} ^youyax\.com [NC]
#rewriteRule ^(.*)$ http://www\.youyax\.com/$1 [R=301,L]

RewriteRule forum/((Index|List|Content|admin|Vote|Message|Favor).*)$ /forum/index.php/$1
#RewriteRule ^/m/((Index|List|Content|admin|Vote|Message|Favor).*)$ /m/index\.php/$1 [L]

试过很多的组合了，就是不成功~
我觉得可能是空间问题啊~~
找原因
[解决办法]
SAPI_Rewrite3.1 教程