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Nginx 允许多个域名跨域访问
    当浏览器发起ajax请求到其他域名时,会出现跨域的问题,在nginx上的解决方案是配置Access-Control-Allow-Origin来解决,此参数只允许配置单个域名或者*,当我们需要允许多个域名跨域访问时却不好配置,可以用map来实现

    map $http_origin $corsHost {
        default 0;
         "~http://127.0.0.1:8080" http://127.0.0.1:8080;
        "~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;
        }
    }