谢谢你,jnns。做得好!
这是您的解决方案,针对 jQuery UI 版本 1.9 进行了更新。
$.effects.effect.customSlide = function (options) {
    var el = $(this),
        props = ['position', 'top', 'bottom', 'left', 'right'];
    // Set options
    var mode = $.effects.setMode(el, options.mode || 'show'); // Set Mode
    var direction = options.direction || 'left'; // Default Direction
    // Adjust
    $.effects.save(el, props);
    el.show(); // Save & Show
    $.effects.createWrapper(el).css({
        overflow: 'hidden'
    }); // Create Wrapper
    var ref = (direction == 'up' || direction == 'down') ? 'top' : 'left';
    var motion = (direction == 'up' || direction == 'left') ? 'pos' : 'neg';
    var distance = options.distance || (ref == 'top' ? el.outerHeight(true) : el.outerWidth(true));
    if (mode == 'show') el.parent().css('height', 0);
    if (mode == 'show') el.css(ref, motion == 'pos' ? (isNaN(distance) ? "-" + distance : -distance) : distance); // Shift
    // Animation
    var animation = {};
    animation[ref] = (mode == 'show' ? (motion == 'pos' ? '+=' : '-=') : (motion == 'pos' ? '-=' : '+=')) + distance;
    el.parent().animate({
        height: (mode == 'show' ? distance : 0)
    }, {
        queue: false,
        duration: options.duration,
        easing: options.easing
    });
    el.animate(animation, {
        queue: false,
        duration: options.duration,
        easing: options.easing,
        complete: function () {
            if (mode == 'hide') el.hide(); // Hide
            $.effects.restore(el, props);
            $.effects.removeWrapper(el); // Restore
            if (options.callback) options.callback.apply(this, arguments); // Callback
            el.dequeue();
        }
    });
};