var url = 'http://1111111.ru/?ref=1';
var host = url.split(/\/+/)[1];
alert(host)

if(!('URL' in window)){
    URL = function URL(url){
        var a = document.createElement('a');
        a.href = url;
        return a;
    }
}
alert(new URL('http://1111111.ru/?ref=1').host);

$("#ads_edit_url").click(function(){
        if($("#ads_param_link_url").val() != ''){
            var url = $("#ads_param_link_url").val();
            if(url.substr(0,4) == "http"){
                var domain = url.split(/\/+/)[1];
                if(domain.substr(0,3) == "www"){
                    var domain = domain.split(/\www+./)[1];
                }
            }else if($("#ads_param_link_url").val().substr(0,3) == "www"){
                var url = $("#ads_param_link_url").val();
                var domain = ("http://"+url).split(/\/+/)[1];
                var domain = domain.split(/\www+./)[1];
            }else{
                var domain = $("#ads_param_link_url").val();
            }
            $("#ads_param_link_domain").removeAttr("readonly");
            $("#ads_param_link_domain").removeAttr("disabled");
            $("#ads_param_link_domain").attr("value", ""+domain+"");
        }else{
            $("#ads_param_link_domain").val("");
            $("#ads_param_link_domain").attr("readonly"," ");
            $("#ads_param_link_domain").attr("disabled"," ");
        }
    });