微信： 

           if ( $http_user_agent ~ "MicroMessenger" ){
                 rewrite ^.* https://www.taobao.com permanent;
            }   

          安卓：

            if ( $http_user_agent ~ "Android" ){
                 rewrite ^.* https://www.baidu.com permanent;
            }   

          苹果：

            if ( $http_user_agent ~ "iPhone" ){
                 rewrite ^.* https://www.jd.com permanent;
            }    

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Nginx 匹配 iphone Android 微信