apache中81端口可以访问，80端口404 not found

wamp环境中，81端口正常访问，但80却出现404错误。（不是因为其他软件占用80端口造成的，那样的话应该就不是404错误了）

最好的办法是打开appache的错误日志，即logs/apache_error.log

发现了如下错误

[Mon Jun 09 15:40:07.210623 2014] [mpm_winnt:notice] [pid 6540:tid 568] AH00354: Child: Starting 150 worker threads.
[Mon Jun 09 15:43:48.322935 2014] [mpm_winnt:notice] [pid 9444:tid 628] AH00422: Parent: Received shutdown signal -- Shutting down the server.
[Mon Jun 09 15:43:50.322937 2014] [mpm_winnt:notice] [pid 6540:tid 568] AH00364: Child: All worker threads have exited.
Failed loading c:/wamp/bin/php/php53/ext/ZendLoader.dll
[Mon Jun 09 15:43:50.352937 2014] [mpm_winnt:notice] [pid 9444:tid 628] AH00430: Parent: Child process 6540 exited successfully.
Failed loading c:/wamp/bin/php/php53/ext/ZendLoader.dll
AH00112: Warning: DocumentRoot [E:/x/mac/] does not exist
AH00112: Warning: DocumentRoot [E:/x/mac/vlc/appcheck3/] does not exist
[Mon Jun 09 15:43:51.964940 2014] [mpm_winnt:notice] [pid 2124:tid 636] AH00455: Apache/2.4.4 (Win32) PHP/5.3.27 configured -- resuming normal operations
[Mon Jun 09 15:43:51.974940 2014] [mpm_winnt:notice] [pid 2124:tid 636] AH00456: Server built: Feb 23 2013 13:07:34
[Mon Jun 09 15:43:51.974940 2014] [core:notice] [pid 2124:tid 636] AH00094: Command line: 'c:\\wamp\\bin\\apache\\apache2.4.4\\bin\\httpd.exe -d C:/wamp/bin/apache/Apache2.4.4'
[Mon Jun 09 15:43:51.974940 2014] [mpm_winnt:notice] [pid 2124:tid 636] AH00418: Parent: Created child process 4676
AH00112: Warning: DocumentRoot [E:/x/mac/] does not exist
AH00112: Warning: DocumentRoot [E:/x/mac/vlc/appcheck3/] does not exist
AH00112: Warning: DocumentRoot [E:/x/mac/] does not exist
AH00112: Warning: DocumentRoot [E:/x/mac/vlc/appcheck3/] does not exist
[Mon Jun 09 15:43:53.524942 2014] [mpm_winnt:notice] [pid 4676:tid 604] AH00354: Child: Starting 150 worker threads.

即有很多错误，如e:/x/mac/没找到，于是乎还是要看httpd.conf配置文件

看看有没有包含其他文件include

不出所料，发现这句。

# Virtual hosts
Include conf/extra/httpd-vhosts.conf

又包含了这个文件，内容是：

<VirtualHost *:80>
ServerAdmin webmaster@dummy-host.example.com
DocumentRoot "E:/php/"
ServerName dummy-host.example.com
ServerAlias www.dummy-host.example.com
ErrorLog "logs/dummy-host.example.com-error.log"
CustomLog "logs/dummy-host.example.com-access.log" common
<Directory "E:/php/"> 
Options Indexes FollowSymLinks 
AllowOverride All
Order allow,deny 
Allow from all 
</Directory> 
</VirtualHost>

原来这里占用了80端口。。。。于是乎改之，或删之。。。

apache service restart即可。。