php - In Apache Server,does making the virtualhost enabled mean the 'Mainhost' is disabled?

I'm configging my apache server. In httpd.conf, I set the DocumentRoot as below:

DocumentRoot "D:/phpwwwroot"
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And I set the directory node as below:

<Directory "D:/phpwwwroot">
    Options Indexes FollowSymLinks
    AllowOverride All
   Order allow,deny
    Allow from all
</Directory>
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For this moment, I haven't enabled the virtual host. And I visit the url:http://localhost:8080/, everything is ok.

Next, I tried to set the virtual host.I uncommented out the Virtual hosts. As below:

# Virtual hosts
Include conf/extra/httpd-vhosts.conf
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And my httpd-vhosts.conf is as below:

NameVirtualHost *:8080

<VirtualHost *:8080>
    ServerName www.testphp1.com
    DocumentRoot "D:\VirtualRoot"
    DirectoryIndex index.shtml index.html index.htm index.php  
    <Directory "D:\VirtualRoot">  
        Options Indexes FollowSymLinks 
        AllowOverride all  
        Order allow,deny  
        Allow from all  
    </Directory>  
</VirtualHost>

<VirtualHost *:8080>
    ServerName www.testphp2.com
    DocumentRoot "D:\VirtualRoot1"
    DirectoryIndex index.shtml index.html index.htm index.php  
    <Directory "D:\VirtualRoot1">  
        Options Indexes FollowSymLinks 
        AllowOverride all  
        Order allow,deny  
        Allow from all  
    </Directory>  
</VirtualHost>
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And I also edit the hosts file to correct the mapping, you should know what I mean:

127.0.0.1 www.testphp1.com
127.0.0.1 www.testphp2.com
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Next restart apache server, visit below urls:

http://www.testphp1.com:8080/
http://www.testphp2.com:8080/
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Everything is ok. They are mapped to the right folder.

A new question raised, When I try to visithttp://localhost:8080/, it come to the first virtual host--www.testphp1.com. I means the page shows whatwww.testphp1.com shows.

It seems that the "main host" doesn't work.

How does it happen? How to fix it