怎么用nginx代理天地图做缓存解决跨域问题

// 采取openlayers添载寰宇图
var layer = new ol.layer.tile({
  source: new ol.source.xyz({
    // crossorigin: 'anonymous', // 能否哀求跨域独霸
    url: url // 寰宇图地点
  })
});

#user nobody;
worker_processes 4;

#error_log logs/error.log;
#error_log logs/error.log notice;
#error_log logs/error.log info;

#pid    logs/nginx.pid;


events {
  worker_connections 10二4;
}

http {
  include    mime.types;
  default_type application/octet-stream;

  #log_format main '$remote_addr - $remote_user [$time_local] "$request" '
  #         '$status $body_bytes_sent "$http_referer" '
  #         '"$http_user_agent" "$http_x_forwarded_for"';

  #access_log logs/access.log main;

  sendfile    on;
  #tcp_nopush   on;

  #keepalive_timeout 0;
  keepalive_timeout 65;

  #gzip on;
  
  client_max_body_size 两0m;
  
　　 # 关头代码块1
  proxy_temp_path ../proxy_cache/tianditu_temp;
  proxy_cache_path ../proxy_cache/tianditu levels=1:二 keys_zone=cache_one:两00m inactive=1d max_size=30g;
  upstream tianditu_server {
    server t0.tianditu.com weight=1 max_fails=两 fail_timeout=30s;
    server t1.tianditu.com weight=1 max_fails=二 fail_timeout=30s;
    server t二.tianditu.com weight=1 max_fails=两 fail_timeout=30s;
    server t3.tianditu.com weight=1 max_fails=两 fail_timeout=30s;
    server t4.tianditu.com weight=1 max_fails=两 fail_timeout=30s;
    server t5.tianditu.com weight=1 max_fails=二 fail_timeout=30s;
    server t6.tianditu.com weight=1 max_fails=两 fail_timeout=30s;
  }
  
  server {
    listen    8088;
    server_name localhost;

    #charset koi8-r;

    #access_log logs/host.access.log main;

　　　　 # 要害代码块两
    location /dataserver {
      more_set_headers 'access-control-allow-origin: *';
      add_header access-control-allow-headers x-requested-with;
      add_header access-control-allow-methods get,post,options;
      
      proxy_cache cache_one;
      proxy_cache_key $uri$is_args$args;
      proxy_pass http://tianditu_server/dataserver;
    }
  }

}