打开Apache配置文件httpd.conf，找到DocumentRoot，将原来的路径那一行用#注释掉，再在下面写上自已的路径，比如这里我用的是DocumentRoot "C:/MyFiles".
改好后如下图所示：
改完可能会出现You don't have permission to access / on this server的情况，出现这种情况则需要在配置文件中再改一项内容：
配置文件中定义了默认对网站根的访问权限：
# Each directory to which Apache has access can be configured with respect
# to which services and features are allowed and/or disabled in that
# directory (and its subdirectories).
#
# First, we configure the "default" to be a very restrictive set of
# features.
#
<Directory />
Options FollowSymLinks
AllowOverride None
Order deny,allow
Deny from all
</Directory>
将<Director>中间的内容改成如下，即可解决问题
<Directory />
Options Indexes FollowSymLinks
AllowOverride None
</Directory>