Hibernate：为什么要使用O / R映射？(Hibernate: why use O/R mapping?)

 代替： 
 
if(currentPosition == numberOfSlides - 1) {
    currentPosition = 0;
} else {
    currentPosition++;
}
 
 您需要将第一张幻灯片移动到最后（并同时调整容器的位置）： 
 
if (currentPosition > 0) {
    $('#slidesHolder').css('marginLeft',0)
        .children().first().appendTo('#slidesHolder');
} else {
    currentPosition += 1;
}
 
 http://jsfiddle.net/mblase75/qatry/ 
 
 或者，为了更好地优化整个事物，您可以消除currentPosition变量和moveSlide子函数，并在.animate方法中使用回调： 
 
function changePosition() {
    $('#slidesHolder').animate({
        'marginLeft': 0-slideWidth
    }, function() {
        $('#slidesHolder').css('marginLeft', 0)
            .children().first().appendTo('#slidesHolder');
    });
}
 
 http://jsfiddle.net/mblase75/8vaCg/ 

Instead of:
 
if(currentPosition == numberOfSlides - 1) {
    currentPosition = 0;
} else {
    currentPosition++;
}
 
You need to move the first slide to the very end (and adjust the position of the container at the same time):
 
if (currentPosition > 0) {
    $('#slidesHolder').css('marginLeft',0)
        .children().first().appendTo('#slidesHolder');
} else {
    currentPosition += 1;
}
 
http://jsfiddle.net/mblase75/qatry/
 
Or, 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');
    });
}
 
http://jsfiddle.net/mblase75/8vaCg/