两种方式，在server段中进行判断，或直接另外针对要转向的域名写server段，最后用rewrite ^/(.*)$ http://目标网址/$1 permanent; 跳转。如：

server { 
  server_name www.wgjlb.com wgjlb.com ; 
  if ($host != 'www.w4s.cn' ) { 
    rewrite ^/(.*)$ http://www.wgjlb.com/$1 permanent; 
  } 
  ... 
} 

server { 
  server_name w4s.cn; 
  rewrite ^/(.*) http://www.wgjlb.com/$1 permanent; 
}