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要优化整个事情多一点，可以消除currentPosition变量和moveSlide子功能，并且只使用一个回调的 .animate方法：

To optimize the whole thing a little more, you can eliminate the currentPosition variable and the moveSlide sub-function, and just use a callback in the .animate method:

function changePosition() {
    $('#slidesHolder').animate({
        'marginLeft': 0-slideWidth
    }, function() {
        $('#slidesHolder').css('marginLeft', 0)
            .children().first().appendTo('#slidesHolder');
    });
}

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