将一维数组转为三维数组，html引入swiper并且自定义左右切换按钮

首先

在head中引入swiper的css和js

<link rel="stylesheet" href="./static/css/swiper-bundle.min.css">
<script src="./static/js/swiper-bundle.min.js"></script>

下载地址

https://www.swiper.com.cn/download/index.html#file1

代码

主要看swiper结构，自定义按钮样式放在swiper盒子外面，然后再用css隐藏它本来的箭头样式，一定要记住在按钮最外层包一个大盒子class为next-box设置相对定位。这样自定义的按钮才会出现，不然就会出不来。

html

<div class="carousel-container">
<div class="swiper">
	<div class="swiper-wrapper" v-if="noticeList2.length > 0">
		<div class="swiper-slide" v-for="(item,index) in noticeList2" :key="index">
			<div v-for="(item2,index2) in item" :key="index2">
				<div class="single-blog">
					<div class="blog-img img-full">
						<a :href="'detail.html?noticeId='+item2.noticeId" :title="item2.noticeName">
							<img style="width: 100%;height: 240px;" :src="item2.noticeImage" alt="">
						</a>
					</div>
					<div class="blog-content">
						<h3 class="post-title text-ellipsis-1"><a :href="'detail.html?noticeId='+item2.noticeId" :title="item2.noticeName">{{item2.noticeName||''}}</a></h3>
						<p class="post-description text-ellipsis-2">{{item2.noticeDesc||''}}</p>
						<div class="d-flex justify-content-between">
							<div class="text-muted">{{defaultType(item2.defaultType)}}相关</div>
							<div class="text-muted">{{parseTime(item2.createTime*1000,'{y}-{m}-{d}')}}</div>
						</div>
					</div>
				</div>
			</div>
		</div>
	</div>
</div>
//左右切换按钮
<div class="next-box">
	<div class="swiper-button-prev">
		<el-button circle size="large">
			<i class="fa fa-arrow-left"></i>
		</el-button>
	</div>
	<div class="swiper-button-next">
		<el-button type="danger" circle size="large">
			<i class="fa fa-arrow-right "></i>
			<!-- <i class="fa-regular fa-angle-right"></i> -->
		</el-button>
	</div>
</div>
</div>

JS 这是数组转换方法

let objArray = [{a: 1}, {b: 2}, {c: 3}, {d: 4}, {e: 5}, {f: 6}, {g: 7}];
let len = objArray.length;
let n = 3; //假设每行显示3个
let lineNum = len % 3 === 0 ? len / 3 : Math.floor( (len / 3) + 1 );
let res = [];
for (let i = 0; i < lineNum; i++) {
  let temp = objArray.slice(i*n, i*n+n);
  res.push(JSON.parse(JSON.stringify(temp)));
}
console.log(res);
this.noticeList2 = result

<script>
window.onload = function() {
	var mySwiper = new Swiper('.swiper', {
		// direction: 'vertical', // 垂直切换选项
		loop: false, // 循环模式选项
		// 如果需要前进后退按钮
		navigation: {
			nextEl: '.swiper-button-next',
			prevEl: '.swiper-button-prev',
		},
		// slidesPerView: 'auto',
		// loopedSlides: 3,
	})
	$('.next-box').click(function(){
		document.getElementById('realIndex').innerHTML = '0' + Number(mySwiper.realIndex + 1)
	})
}
</script>

CSS

.swiper {
    width: 100%;
}  
.next-box {
	position: relative;
}
.swiper-button-next:after, .swiper-button-prev:after {
	display: none;
}
.swiper-button-next, .swiper-button-prev {
	position: initial !important;
	margin: 0 !important;
}
.swiper-slide {
	display: flex;
}

实现效果

就是一行展示三列数据，每次切换一次， 展示一个。

注意： 点击按钮或者分页出现黑色边框

.swiper-pagination-bullet-active:focus {
	outline: none;
}