只需在http{}里面加入以下代码
upstream qingshouba.com{
    server 114.55.178.97:8080 weight=5;
    server 114.55.178.97:8090 weight=5;
    }
    #gzip  on;
    server {
        listen       80;
        server_name  localhost;
        #charset koi8-r;
        #access_log  logs/host.access.log  main;
        location / {
            root   html;
            index  index.html index.htm;
      proxy_pass http://qingshouba.com;  
        
}