问如何在jQuery :not和hasClass()中使用来获取没有类的特定元素

EN

$('#sitesAccordion .groupOfSites').click(function() {
    var lastOpenSite = $(this).siblings().hasClass(':not(.closedTab)');
    console.log(lastOpenSite);
});

.hasClass(':not(.closedTab)');

$('#sitesAccordion .groupOfSites').click(function() {

    //Get the last opened tab
    var lastOpenSite = $(this).siblings().hasClass(':not(.closedTab)');

    //Close last opened tab and add class
    lastOpenSite.hide().toggleClass('closedTab');

    //Open the current Tab
    $(this).children('.accordionContent').toggle('fast');

    // remove class from open tab
    $(this).toggleClass('closedTab');


});