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<div class="box"></div>
<button onclick="last()">上一组</button>
<button onclick="next()">下一组</button>
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上一组
下一组

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var arr = ['-1', '-2', '-3', '-4', '-5', '-6', '-7', '-8', '-9', '-10', '-11', '-12', '-13', '-14', '-15', '-16', '-17']
var newArr = [] //新数组
var index = 0; //初始下标
var length = 5; //显示5条 
for (var i = index; i < length + index; i++) {
    newArr.push(arr[i]);
}
$('.box').html(newArr)
// 上一组
function last() {
    if (index > 0) {
        index = index - length;
    }
    // 不需要循环删除else
    else {
        index = arr.length - length
    }
    newArr = []
    for (var i = index; i < length + index; i++) {
        newArr.push(arr[i])
    }
    $('.box').html(newArr)
}
// 下一组
function next() {
    if (index < arr.length - length) {
        index = index + length
    }
    // 不需要循环删除else
    else {
        index = 0
    }
    newArr = []
    for (var i = index; i < length + index; i++) {
        newArr.push(arr[i])
    }
    $('.box').html(newArr)
}
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