在nginx.conf的根server  location上新增如下配置

 location / {
			if ($request_method = 'OPTIONS') {
				add_header 'Access-Control-Allow-Origin' '*';
				add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
				#
				# Custom headers and headers various browsers *should* be OK with but aren't
				#
				add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type';
				#
				# Tell client that this pre-flight info is valid for 20 days
				#
				add_header 'Access-Control-Max-Age' 1728000;
				add_header 'Content-Type' 'text/plain charset=UTF-8';
				add_header 'Content-Length' 0;
				return 204;
			}
			if ($request_method = 'POST') {
				add_header 'Access-Control-Allow-Origin' '*';
				add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
				add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type';
			}
			if ($request_method = 'GET') {
				add_header 'Access-Control-Allow-Origin' '*';
				add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
				add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type';
			}
            root   html;
            index  index.html index.htm;
			
        }