不带www的网址301转向到带www的代码。【UCH】

亲爱站长们帮我看看301设置的对不对。
我的目标是 bjkxw.com 转向到 www.bjkxw.com
例如：
bjkxw.com   →   www.bjkxw.com
bjkxw.com/help.php  →   www.bjkxw.com/help.php

我有代码，但我不会查301设置的正确不正确。帮个忙啊。谢谢啦。
证明安全且可用，我再把代码放上来。

如果不做301转向的话：
    Search engines may think bjkxw.com and www.bjkxw.com are two different sites.You should set up a permanent redirect (technically called a "301 redirect") between these sites. Once you do that, you will get full search engine credit for your work on these sites.

我也不会!我来学习的

1. RewriteEngine On
   
2. 
   
3. RewriteCond %{HTTP_HOST} ^xxx.com$ [NC]
   
4. RewriteRule ^(.*)$ http://www.xxx.com/$1 [L,R=301]

复制代码

演示: http://luyinfc.com/space-1.html
http://luyinfc.com/network.html

如何实现的？方法教一下啊？

1. RewriteEngine On
   
2. RewriteCond %{HTTP_HOST} ^matou.us [NC]
   
3. RewriteRule ^(.*)$ http://www.matou.us/$1 [L,R=301]
   
4. RewriteBase /
   
5. RewriteRule ^(space|network)\-(.+)\.html$ $1.php?rewrite=$2 [L]
   
6. RewriteRule ^(space|network)\.html$ $1.php [L]
   
7. RewriteRule ^([0-9]+)$ space.php?uid=$1 [L]  

复制代码

已经升级 不错 http://bbs.14156.com