解决 nginx 跨域 问题

在nginx的配置文件中增加：

location / {
  add_header Access-Control-Allow-Origin $http_origin;
  add_header Access-Control-Allow-Methods 'GET,POST,OPTIONS';
  add_header Access-Control-Allow-Credentials true;
  add_header Access-Control-Allow-Headers *;
  add_header Access-Control-Max-Age 1728000;
  if ($request_method = 'OPTIONS') {
        return 204;
    }
}