我需要帮助。我有一个简单的jQuery滑块，它工作得很好，但我无法弄清楚这种情况：例如，如果我有4个图像，当我到达第四个图像时，我希望能够通过单击'Next'按钮从第四个图像转到第一个图像。我怎么能那样做？

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$(document).ready(function(){
    $('.next').on('click', function(){
        var currentImg = $('.active');
        var nextImg = currentImg.next();

        if(nextImg.length){
            currentImg.removeClass('active').css('z-index', -10);
            nextImg.addClass('active').css('z-index', 10);
        }
    });

    $('.prev').on('click', function(){
        var currentImg = $('.active');
        var prevImg = currentImg.prev();

        if(prevImg.length){
            currentImg.removeClass('active').css('z-index', -10);
            prevImg.addClass('active').css('z-index', 10);
        }
    });
});

.controls{
    display: flex;
}
.control{
    padding:20px 60px;
    text-align: center;
    font-size: 1.2em;
    border:1px solid #939393;
    font-weight: 600;
    cursor:pointer;
    font-family: 'Recife';
    user-select: none;
}
.prev{
    border-right: none;
    background-color: #939393;
}
.img-wrapper{
    position: absolute;
    width:100%;
    height:100%;
}
.img-wrapper img{
    position: absolute;
    width: 100%;
    height:100%;
    object-fit: cover;
    display: none;
}
.img-wrapper img.active{
    display: inline-block;
}
.next{
    background-color: #fff;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="controls">
            <span class="prev control">prev</span>
            <span class="next control">next</span>
        </div>
        <div class="img-wrapper">
            <img src="img-one.jpg" alt="one" class="active">
            <img src="img-two.jpg" alt="two">
            <img src="img-three.jpg" alt="three">
            <img src="img-four.jpg" alt="four">
        </div>

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