1 必须要开启 NameVirtualHost开关选项，
如：NameVirtualHost 220.231.220.231:80
2 NameVirtualHost 需要指定具体的端口
例如":80",跟<VirtualHost 220.231.32.*:80>对应，否则会报错:
mixing * ports and non-* ports with a NameVirtualHost address is not supported, proceeding with undefined results。
翻译过来就是: NameVirtualHost 地址，指定端口和不指定端口混合使用是不支持的，将会产生未逾期的后果。
未逾期的后果就是: 第2个不起作用，仅当一个站点设置起作用。
完整的例子:
#
# VirtualHost example:
# Almost any Apache directive may go into a VirtualHost container.
# The first VirtualHost section is used for requests without a known
# server name.
#
NameVirtualHost 219.133.61.226:80
<VirtualHost 219.133.61.226:80>
ServerAdmin[email protected]
DocumentRoot /usr/local/apache2/htdocs1
ServerNamewww.server110.com
ErrorLog logs/server110.com-error_log
CustomLog logs/linux51.com-access_log common
</VirtualHost>
<VirtualHost 219.133.61.226:80>
ServerAdmin[email protected]
DocumentRoot /usr/local/apache2/htdocs2
ServerNamewww.x.com
ErrorLog logs/x.com-error_log
CustomLog logs/x.com-access_log common
</VirtualHost>