nginx 同一域名根据设备不同切换 root 目录

当切换移动端，就 404，看 nginx 日志请求了 物理路径；

 location / {
            root /usr/share/nginx/html/seller_app_pc/;
            if ( $http_user_agent ~ "(iPhone)|(Android)" ){
              root /usr/share/nginx/html/seller_app_h5/;
            }
          index index.html;
          try_files $uri $uri/ @router;
        }
       location @router {
        rewrite ^.*$ /index.html last;
    }