jquery, javascript - how to remove this parameter from variable

I have some coding and already pushed this into a variable. I would like to remove it and reinsert another value. Please note that I am programming a lot of the coding with perl. I would like to remove menu_mode value. Any tips would be a great since javascript/jquery are a new language to me.

    print qq|
               \$("#extractparam").click(function () {
                   \$("#grapharea").html(" ");|;

    foreach my $num (1 .. $count)
    {
        if ($num eq 1)
        {
            print STDOUT qq|var params = \$("#volt$num").serializeArray();|;
        } else
        {
            print STDOUT qq|var volt$num = \$("#volt$num").serializeArray();|;
            print STDOUT qq|params = \$.merge(params, volt$num);|;
        }
    }

print qq|          params.push({ name: 'menu_mode', value: '3C-extractparameters' });
                   \$.get("./scripts/banana_extract.cgi", params, function(data){ \$("#paramselection").html(data) });

                   // would like to remove the menu_mode value

                   params.push({ name: 'menu_mode', value: '3D-extractparameters' });
                   \$.get("./scripts/banana_extract.cgi", params, function(data){ \$("#graphoptionselection").html(data) });

                    \$("#extractparam").removeAttr('sty开发者_运维百科le');
                    \$("#Execute_Button").css("background-color","lightblue");

               });

If I understand your question correctly you want this:

params.pop();

That'll remove the last element from the array (the one you just pushed).