If not has a initial sorting order and click header with MultiSortKey, the default sortList will be changed

[lijinpengFj]

hi, I use this plugin in my application and I find that if I call plugin without config 'sortList' , just like $("table").tablesorter({}), and then click header with MultiSortKey (like shift), $.tablesorter.defaults.sortList is changed to the be the current sort column's index and order.

In my application, I need to reset the table. So in this state if I do it, the table will have the default sort order. I think it's unexpected.

I check the code of plugin. In jquery.tablesorter.js L711, it call $.extend.

config = $.extend(this.config, $.tablesorter.defaults, settings);

if settings don't have a sorList, config.sortList will be $.tablesorter.defaults.sortList.

config.sortList == $.tablesorter.defaults.sortList
//is true

The reason are array is reference type and $.extend is not recursive by default , so they are the same reference, the same array, if change one, another one will be changed.

And in L778, config.sortList is changed and the default is changed too.

I think you can use $.extend with deep = true or give the settings.sortList a default value, an empty array to fix it.

Good Day! : )