我知道您可以使用以下方法指定项目是否没有类:
if (!$(this).hasClass("test")) {
这很棒,但我无法确定在我的代码中使用它的位置。我正在使用 mixitup jQuery 插件进行过滤,并且在整个过程中都有一些 if 条件。我想说的是,如果没有一个兄弟姐妹$t('[data-filter="all"]具有“活动”类,则将活动类应用于$t并将变量 filterString 设置为“全部”。
我希望效果是,如果您删除所有过滤器,它会将其设置回默认的“全部”过滤器。见下文:
// INSTANTIATE MIXITUP
$('#equipment-grid').mixitup({
    //layoutMode: 'list', // Start in list mode (display: block) by default
    //listClass: 'list', // Container class for when in list mode
    //gridClass: 'grid', // Container class for when in grid mode
    effects: ['fade', 'blur'], // List of effects 
    //listEffects: ['fade','rotateX'] // List of effects ONLY for list mode
});
// HANDLE MULTI-DIMENSIONAL CHECKBOX FILTERING
/*  
 *  We can't used the default multiFilter because it
 *   behaves differently to what is required here.
 */
var $filters = $('#filters').find('li');
var filterString = 'all';
// Bind checkbox click handlers:
$filters.on('click', function () {
    var $t = $(this),
        filter = $t.attr('data-filter');
    if (filter == 'all') {
        // If "all"
        if (!$t.hasClass('active')) {
            // if unchecked, check "all" and uncheck all other active filters
            $t.addClass('active').siblings().removeClass('active');
            // Replace entire string with "all"
            filterString = 'all';
        }
    } else {
        // Else, uncheck "all"
        $t.siblings('[data-filter="all"]').removeClass('active');
        // Remove "all" from string
        filterString = filterString.replace('all', '');
        if (!$t.hasClass('active')) {
            // Check checkbox
            $t.addClass('active');
            // Append filter to string
            filterString = filterString == '' ? filter : filterString + ' ' + filter;
        } else {
            // Uncheck
            $t.removeClass('active');
            // Remove filter and preceeding space from string with RegEx
            var re = new RegExp('(\\s|^)' + filter);
            filterString = filterString.replace(re, '');
        };
    };
    /*
     *  We then send these strings to MixItUp using the filter method. We can send as
     *  many dimensions to MixitUp as we need using an array as the second argument
     *  of the "filter" method. Each dimension must be a space seperated string.
     */
    $('#equipment-grid').mixitup('filter', [filterString])
});