nginx代理配置跨域

Access to XMLHttpRequest at 'http://localhost:85/api/login/index?mobile=13851739962&password=asdf1234' from origin 'http://localhost:8080' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.

	if ($request_method = 'OPTIONS') {
     set $cors "isreqoptions";
    }
    add_header Access-Control-Allow-Origin *;
    add_header Access-Control-Allow-Methods GET,POST,PUT,DELETE,PATCH,OPTIONS;
    add_header Access-Control-Allow-Headers Origin,X-Requested-With,Content-Type,Accept,Authorization,user-agent,token;
   if ($cors = 'isreqoptions') {
      return 200;
    }