code review by fei.hong: fixes bug to www redirect url

@@ -75,10 +75,10 @@ class Mobile
         if ($uri === '/woman') {
             $uri = '/girls';
         }
+        // 首页特殊跳转
         if ($host === 'www.yohobuy.com') {
             return 'm.yohobuy.com' . $uri;
         }
-        
         $url = strtr($host, array('.yohobuy.com' => '.m.yohobuy.com')) . $uri;
         
         return $url;