允許下面三個域名http://www.123admin.com、http://m.123admin.com、http://wap.123admin.com 進行跨域訪問

map $http_origin $corsHost {
    default 0;
    "~http://www.123admin.com" http://www.123admin.com;
    "~http://m.123admin.com" http://m.123admin.com;
    "~http://wap.123admin.com" http://wap.123admin.com;
}
server
{
    listen 80;
    server_name search.123admin.com;
    root /nginx;
    location /
    {
        add_header Access-Control-Allow-Origin $corsHost;
    }
}