如何让Slider显示下一个或上一个跨度点击

Question

我使用bootstrap 3的组合，只是从头开始编写。

当我点击图片缩略图时，他们会执行他们应该执行的操作，但是当我点击跨度箭头时，它不会转到下一张或上一张图像。

以下是代码：

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var maximages = 6;
var startpath = "imgs"
var extension = ".jpg"


function calcslide(x) {
    var currentimage = document.getElementById("bigpic").src;
    var dotat = currentimage.indexOf(extension);
    var stringnumber = currentimage.substr(dotat - 2, 2);
    var nextnum = parseInt(stringnumber) + x;
    if (nextnum < 1) {
        nextnum = maximages;
    }
    if (nextnum > maximages) {
        nextnum = 1;
    }
    var twodigitnum = ("0" + nextnum).slice(-2);
    var showimg = startpath + twodigitnum + extension;
    showbig(showimg);
}

function showbig(pic) {
    document.getElementById("bigpic").src = pic;
}

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.slider {
    text-align: center;
}

#bigpic {
    height: 500px;
}

.thumbs img {
    height: 100px;
    padding: 20px 0 20px 0;
}

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 <div class="slider">
                <span class="glyphicon glyphicon-chevron-left btn btn-lg" alt="previous" onclick="calcslide(-1)"></span>
                <img src="imgs/slider01.jpg" id="bigpic" />
                <span class="glyphicon glyphicon-chevron-right btn btn-lg" alt="next" onclick="calcslide(1)"></span>
                <div class="thumbs">
                    <span class="glyphicon glyphicon-chevron-left" alt="previous" onclick="calcslide(-1)"></span>
                    <img src="imgs/slider01.jpg" onclick="showbig(this.src)" />
                    <img src="imgs/slider02.jpg" onclick="showbig(this.src)" />
                    <img src="imgs/slider03.jpg" onclick="showbig(this.src)" />
                    <img src="imgs/slider04.jpg" onclick="showbig(this.src)" />
                    <img src="imgs/slider05.jpg" onclick="showbig(this.src)" />
                    <img src="imgs/slider06.jpg" onclick="showbig(this.src)" />
                    <span class="glyphicon glyphicon-chevron-right" alt="next" onclick="calcslide(1)"></span>
                </div>
            </div>

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Answer 1

在路径构造中的某处缺少斜杠/和前缀。

而不是：

 var showimg = startpath + twodigitnum + extension

我会尝试：

 var showimg = startpath + '/slider' + twodigitnum + extension