The environment is wamp3 and apache is 2.4. When using wamp2.5 before, the documentroot was designated as h:demo (there is no index.php or the like in the main directory). Every time you open localhost, it is a directory of all projects. After updating wamp3 this time, I found that opening localhost was not found, but typing localhost/test/ can open the project (there is index.php under test), indicating that the configuration of documentroot is correct. I checked how to display the apache directory.
The answer is that in http.conf
Options Indexes FollowSymLinks
But I found that I have this item
<Directory "H:/Demo">
#
# Possible values for the Options directive are "None", "All",
# or any combination of:
# Indexes Includes FollowSymLinks SymLinksifOwnerMatch ExecCGI MultiViews
#
# Note that "MultiViews" must be named *explicitly* --- "Options All"
# doesn't give it to you.
#
# The Options directive is both complicated and important. Please see
# http://httpd.apache.org/docs/2.4/mod/core.html#options
# for more information.
#
Options Indexes FollowSymLinks
#
# AllowOverride controls what directives may be placed in .htaccess files.
# It can be "All", "None", or any combination of the keywords:
# AllowOverride FileInfo AuthConfig Limit
#
AllowOverride all
#
# Controls who can get stuff from this server.
#
# onlineoffline tag - don't remove
Require local
</Directory>
