nginx允许跨域设置：

#官网地址

location / {

if ($request_method = 'OPTIONS') {

    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,Content-Range,Range,Token';

    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,Content-Range,Range,Token';

    add_header 'Access-Control-Expose-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range,Token';

}

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,Content-Range,Range,Token';

    add_header 'Access-Control-Expose-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range,Token';

}

proxy_pass http://127.0.0.1:5140/pushdata;