项目需求，需要写一个卡片化层叠的轮播，找了下插件都没有合适的，于是写了一个展示5个卡片的轮播
先看效果图：
卡片化层叠轮播
5个卡片要计算各自的高度，宽度，利用相对定位计算出各自的位置
然后transition过渡来实现动画效果
由于开头卡片和末尾卡片的滑动整体性，我在config5数组开头和末尾加了2个隐藏的样式。使得有个滑出屏幕的效果
下面是我的代码：
<template>
<div>
<transition name="fade">
<div @touchend='end' @touchstart='start' @touchmove='move' class="swiper">
<div @click="chooseItem(item,index)" v-for="(item, index) in imgs" :style="config5[index]" :key="item.cover">
<img :src="item.cover" style="width: 100%; height: 100%;">
</div>
</div>
</transition>
<h1 @click="prev">上一个</h1>
<h1 @click="next">下一个</h1>
<h1>当前：{{ centerInfo.id }}</h1>
</div>
</template>
<script>
export default {
name: 'zt',
data() {
return {
loading: true,
currentIndex: 3, //当前中间imgs数组中index
centerInfo: '', // 当前中间信息
startX: '',
endX: '',
imgs: [
{
id: '莱因哈特1',
index: 0,
cover:
'https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1572888260036&di=875bc88905bf4b6923784df1589edb0b&imgtype=0&src=http%3A%2F%2Fi-1.itobike.com%2F2017%2F5%2F26%2Ff6038942-393f-441e-9380-a2f1607c3385.jpg'
},
{
id: '安娜2',
index: 1,
cover:
'https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1572888297322&di=9d5d97f952329ccf2277b2033b129d5d&imgtype=0&src=http%3A%2F%2Fb-ssl.duitang.com%2Fuploads%2Fitem%2F201803%2F28%2F20180328101238_VHiji.jpeg'
},
{
id: '卢西奥3',
index: 2,
cover:
'https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1573483062&di=9d6983ba28c123896b27148e313ada65&imgtype=jpg&er=1&src=http%3A%2F%2Fb-ssl.duitang.com%2Fuploads%2Fitem%2F201608%2F15%2F20160815133037_4YAfh.jpeg'
},
{
id: 'DVA4',
index: 3,
cover:
'https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1572888405708&di=3381891cd042db432083ed2446ddf446&imgtype=0&src=http%3A%2F%2Fb-ssl.duitang.com%2Fuploads%2Fitem%2F201805%2F06%2F20180506201144_JPTd3.thumb.700_0.jpeg'
},
{
id: '莫伊拉5',
index: 4,
cover:
'https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1572888441984&di=47544529365104e11276d639838741c3&imgtype=0&src=http%3A%2F%2Fb-ssl.duitang.com%2Fuploads%2Fitem%2F201801%2F06%2F20180106221938_58EGv.thumb.224_0.jpeg'
},
{
id: '裂空6',
index: 5,
cover:
'https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1572888482891&di=5416c6abf187547cd329377dc1092fff&imgtype=0&src=http%3A%2F%2Fb-ssl.duitang.com%2Fuploads%2Fitem%2F201610%2F20%2F20161020175323_auiK8.thumb.700_0.jpeg'
},
{
id: '麦克雷7',
index: 6,
cover:
'https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1572888500984&di=f415feaef2c02b497e9d3801743b8e49&imgtype=0&src=http%3A%2F%2Fb-ssl.duitang.com%2Fuploads%2Fitem%2F201711%2F26%2F20171126191812_4x8RV.thumb.700_0.jpeg'
},
{
id: '士兵76 8',
index: 7,
cover:
'https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1573056788040&di=dbf1954ad8ba1bee16afd9f47d763512&imgtype=0&src=http%3A%2F%2Fb-ssl.duitang.com%2Fuploads%2Fitem%2F201704%2F24%2F20170424202013_hveir.jpeg'
},
{
id: '狂鼠9',
index: 8,
cover:
'http://ztd00.photos.bdimg.com/ztd/w=700;q=50/sign=ea29fa95c13d70cf4cfaa80dc8e7a03d/42166d224f4a20a4d334946b98529822720ed070.jpg'
},
{
id: '死神 10',
index: 9,
cover:
'http://www.agri35.com/UploadFiles/img_2_4163694432_214245738_26.jpg'
},
{
id: '禅雅塔 11',
index: 10,
cover:
'http://pic2.zhimg.com/v2-1c9b73f260ea2652dcdedfc782fde90d_b.jpg'
},
{
id: '黑百合 12',
index: 11,
cover:
'http://b-ssl.duitang.com/uploads/item/201710/14/20171014134122_KmPQy.jpeg'
}
],
previous: 0,
config5: [
{
id: '-A',
position: 'absolute',
width: '22%',
height: '72%',
top: '19.2%',
left: '-22%',
opacity: 0,
zIndex: 0,
transition: '.4s'
},
{
id: 'A',
position: 'absolute',
width: '22%',
height: '72%',
top: '19.2%',
left: '0%',
opacity: 1,
zIndex: 1,
transition: '.4s'
},
{
id: 'B',
position: 'absolute',
width: '28%',
height: '82%',
top: '14%',
left: '13%',
opacity: 1,
zIndex: 2,
transition: '.4s'
},
{
id: 'center',
position: 'absolute',
width: '45%',
height: '100%',
top: '0px',
left: '50%',
marginLeft: '-22.5%',
opacity: 1,
zIndex: 4,
transition: '.4s'
},
{
id: 'D',
position: 'absolute',
width: '28%',
height: '82%',
top: '14%',
left: '61.8%',
opacity: 1,
zIndex: 2,
transition: '.4s'
},
{
id: 'E',
position: 'absolute',
width: '22%',
height: '72%',
top: '19.2%',
left: '78%',
opacity: 1,
zIndex: 1,
transition: '.4s'
},
{
id: 'E+',
position: 'absolute',
width: '22%',
height: '72%',
top: '19.2%',
left: '100%',
opacity: 0,
zIndex: 0,
transition: '.4s'
}
]
};
},
methods: {
// 获取数据
async getData() {
this.$nextTick(() => {
this.loading = false;
});
},
// 滑动上一个
prev(index) {
// this.imgs.unshift(this.imgs.pop());
this.config5.push(this.config5.shift());
this.currentIndex = this.currentIndex - 1;
if (this.currentIndex < 0) {
this.currentIndex = this.imgs.length - 1;
}
this.centerCard();
this.centerIndex('prev');
},
// 滑动下一个
next() {
// this.imgs.push(this.imgs.shift());
this.config5.unshift(this.config5.pop());
this.currentIndex = this.currentIndex + 1;
if (this.currentIndex > this.imgs.length - 1) {
this.currentIndex = 0;
}
this.centerCard();
this.centerIndex('next');
// console.log(this.currentIndex);
},
// 开始移动端滑动屏幕
start(event) {
this.startX = event.changedTouches[0].clientX;
this.startY = event.changedTouches[0].clientY;
},
// 连续滑动
move(event) {
this.endY = event.changedTouches[0].clientY;
this.endX = event.changedTouches[0].clientX;
this.stopDefault(event);
// 如果是滑动，注解（223行到231行）这段。如果是连续滑动，放开（223行到231行）注解
this.interval = this.endX - this.startX;
if (this.interval > 40) {
this.startX = this.endX;
this.prev();
}
if (this.interval < -40) {
this.startX = this.endX;
this.next();
}
},
// 滑动
end(event) {
// 如果是滑动，放开（236行到238行）的注解。如果是连续滑动，注解（236行到238行）
// this.endY = event.changedTouches[0].clientY;
// this.endX = event.changedTouches[0].clientX;
// this.formatSwiper();
},
formatSwiper() {
if (this.startX > this.endX) {
console.log('左边滑动');
if (this.startX > this.endX + 40) {
this.next();
}
} else {
console.log('右边滑动');
if (this.endX > this.startX + 40) {
this.prev();
}
}
},
// 阻止touchmove的横向默认事件（ios快捷操作会关闭页面）
stopDefault(event) {
let differenceY = this.endY - this.startY;
let differenceX = this.endX - this.startX;
if (Math.abs(differenceX) > Math.abs(differenceY)) {
event.preventDefault();
}
},
// 当前imgs在位置上的index（并非img数组的index）
centerIndex(val) {
if (val == 'prev') {
for (let val of this.imgs) {
if (val.index == this.imgs.length - 1) {
val.index = 0;
} else {
val.index = val.index + 1;
}
}
} else {
for (let val of this.imgs) {
if (val.index == 0) {
val.index = this.imgs.length - 1;
} else {
val.index = val.index - 1;
}
}
}
},
// 点击
chooseItem(item, index) {
let cycles = item.index;
if (item.index < 3) {
for (let i = 0; i < 3 - cycles; i++) {
console.log(item.index);
this.prev();
}
} else if (item.index > 3) {
for (let i = -1; i < item.index - 3; i++) {
this.next();
}
} else if (item.index == 3) {
console.log('投票');
}
},
// 计算中间卡片信息
centerCard() {
this.centerInfo = this.imgs[this.currentIndex];
this.$emit('centerInfo', this.centerInfo);
// this.$emit('centerInfo', this.centerInfo);
// console.log(this.imgs[2].id);
},
addCardStyle() {
if (this.imgs.length > 7) {
let addtime = this.imgs.length - 7;
for (let i = 0; i < addtime; i++) {
console.log('add');
this.config5.push({
id: 'center',
position: 'absolute',
width: '45%',
height: '100%',
top: '0px',
left: '50%',
marginLeft: '-22.5%',
opacity: 0,
transition: '.1s'
});
}
}
}
},
created() {
this.getData();
this.centerCard(); // 获取中间卡片信息
this.addCardStyle();// 加入样式位置的index
}
};
</script>
<style lang="less" scoped>
.swiper {
width: 100%;
border: 1px red solid;
height: 400px;
position: relative;
overflow: hidden;
div {
opacity: 0;
}
}
</style>
关键就在于config5这个对象中，作为动态的css效果，计算好各个卡片位置，然后:style动态获取样式
可以手动调节样式大小，位置。
当然如果需要展示3个卡片或者7个卡片的话，是需要再次计算各个卡片位置的。
