效果展示
Demo代码
wxml
代码语言：javascript复制<view class="selection_cards" bindtouchstart="touchstart" bindtouchmove="touchmove" bindtouchend="touchend">
<view class="selection_cards_item" wx:for="{{list}}" wx:key="index"
style="left:{{item.style.left}}px; z-index:{{item.style.zIndex}};transform:{{item.style.transform}};opacity:{{item.style.opacity}};transition:{{!isTouch?'0.1s':0}};background-image: url({{item.backimage}});">
</view>
</view>wxss
代码语言：javascript复制/*层叠轮播选牌，css*/
.selection_cards{
width: 100%;
height: 400rpx;
position: relative;
margin-top: 200px;
z-index: 99;
}
.selection_cards_item{
width: 194rpx;/*188*/
height:350rpx;/*340*/
background-size: 100%;
/* overflow: hidden; */
border-radius: 16rpx;
position: absolute;
top: 0;
color: white;
font-size: 100rpx;
box-sizing: border-box;
}js
代码语言：javascript复制Page({
data: {
cardNumber: 7,
indexArr: [-3, -2, -1, 0, 1, 2, 3],
list: [],
listArr: [],
startPageX: 0,
cardWidth: 0,
screenWidth: 0,
isTouch: false,
},
onLoad() {
let _this = this;
_this.init();
},
/*层叠轮播图初始化*/
init: function () {
let _this = this;
wx.getSystemInfo({
success(res) {
//获取屏幕的宽成功
let arr = [];
let len = _this.data.cardNumber;
let cardWidth = res.screenWidth / 750 * 194;
for (let i = 0; i < len; i ) {
let item = {
option: 0, //自定义选项
left: (i * (cardWidth / 2)),
scale: (3 - Math.abs(_this.data.indexArr[i])) * 0.4,
zIndex: 3 - Math.abs(_this.data.indexArr[i]),
style: {
left: (i * (cardWidth / 2)),
transition: 0,
zIndex: 3 - Math.abs(_this.data.indexArr[i]),
transform: "scale(" ((3 - Math.abs(_this.data.indexArr[i])) * 0.4) ")",
opacity: (3 - Math.abs(_this.data.indexArr[i]) != 0) ? 1 : 0
},
backimage:"",
}
item.option = i;
arr.push(item);
}
arr[0].backimage="https://ww2.sinaimg.cn/bmiddle/005SWChdly1g5q9gkj0nhj30u01rc167.jpg"
arr[1].backimage="https://ww3.sinaimg.cn/bmiddle/005SWChdly1g5q9gk2lrjj30u01rcna4.jpg"
arr[2].backimage="https://ww3.sinaimg.cn/bmiddle/005SWChdly1g5q9gjq3dij30u01rc14p.jpg"
arr[3].backimage="https://ww2.sinaimg.cn/bmiddle/005SWChdly1g5q9ginahaj30u01rc49y.jpg"
arr[4].backimage="https://ww4.sinaimg.cn/bmiddle/005SWChdly1g5q9gi6alkj30u01rc14q.jpg"
arr[5].backimage="https://ww3.sinaimg.cn/bmiddle/005SWChdly1g5q9gho9hzj30u01rcalv.jpg"
arr[6].backimage="https://ww3.sinaimg.cn/bmiddle/005SWChdly1g5q9ghakxfj30u01rcds3.jpg"
console.log(arr);
_this.setData({
screenWidth: res.screenWidth,
cardWidth,
list: arr,
listArr: arr
})
}
})
},
/*触摸开始*/
touchstart(e) {
//console.log(e.changedTouches[0].pageX);
this.setData({
startPageX: e.changedTouches[0].pageX,
isTouch: true //开始触摸
});
},
/*触摸移动*/
touchmove(e) {
let _this = this;
let pageX = e.changedTouches[0].pageX;
let move = pageX - _this.data.startPageX; //正数，向右滑动；负数，向左滑动
let list = JSON.parse(JSON.stringify(_this.data.list));
let len = list.length;
//console.log(move);
if (move > 0) { //向右滑
for (let i = 0; i < len; i ) {
list[i].style.left = list[i].left ((move) * 0.52);
if (_this.data.indexArr[i] < 0) {
list[i].style.transform = "scale(" (list[i].scale (move * 0.005)) ")";
list[i].style.zIndex = list[i].zIndex 1;
if (_this.data.indexArr[i] >= -3) {
list[i].style.opacity = 1;
}
} else {
list[i].style.transform = "scale(" (list[i].scale - (move * 0.005)) ")";
list[i].style.zIndex = list[i].zIndex - 1;
if (_this.data.indexArr[i] >= 2) {
list[i].style.opacity = 0;
}
}
}
//检查是否，向右
if (list[2].style.left >= list[3].left) {
let newArr = [];
for (let i = 0; i < len; i ) {
let index = i; //当前将要变成哪一个坐标元素的位置
if (i 1 != len) {
index = i 1;
} else {
//最后一个元素到第一个元素的位置
index = 0;
}
let current_option = list[i].option;
// console.log('current_option',current_option);
// console.log('list[i].option',list[i].option);
let item = _this.data.listArr[index];
item.option = current_option;
item.backimage=list[i].backimage
newArr[index] = item;
}
// console.log('old', list);
// console.log('new', newArr);
list = newArr;
_this.setData({
startPageX: pageX
});
}
_this.setData({
list
})
} else { //向左滑
for (let i = 0; i < len; i ) {
list[i].style.left = list[i].left ((move) * 0.52);
if (_this.data.indexArr[i] <= 0) {
list[i].style.transform = "scale(" (list[i].scale - Math.abs(move * 0.005)) ")";
list[i].style.zIndex = list[i].zIndex - 1;
if (_this.data.indexArr[i] <= -2) {
list[i].style.opacity = 0;
}
} else {
list[i].style.transform = "scale(" (list[i].scale Math.abs(move * 0.005)) ")";
list[i].style.zIndex = list[i].zIndex 1;
if (_this.data.indexArr[i] >= 2) {
list[i].style.opacity = 1;
}
}
}
//检查，向左
if (list[3].style.left <= list[2].left) {
let newArr = [];
for (let i = 0; i < len; i ) {
let index = i;
if (i == 0) {
index = len - 1;
} else {
index = i - 1;
}
let current_option = list[i].option;
// console.log('current_option',current_option);
// console.log('list[i].option',list[i].option);
let item = _this.data.listArr[index];
item.option = current_option;
item.backimage=list[i].backimage
newArr[index] = item;
}
// console.log('old', list);
// console.log('new', newArr);
list = newArr;
_this.setData({
startPageX: pageX
});
}
_this.setData({
list
})
}
},
/*触摸结束*/
touchend(e) {
console.log('触摸结束');
let _this = this;
let list = JSON.parse(JSON.stringify(_this.data.list));
let len = list.length;
_this.setData({
isTouch: false //关闭触摸
})
if (list[2].style.left >= list[3].left||list[3].style.left <= list[2].left) {
//console.log('翻牌了');
} else {
//移动的距离不够
for (let i = 0; i < len; i ) {
list[i].style.left = list[i].left;
list[i].style.zIndex = list[i].zIndex;
list[i].style.transform = "scale(" list[i].scale ")";
list[i].style.opacity = (3 - Math.abs(_this.data.indexArr[i]) != 0) ? 1 : 0
}
_this.setData({
list
})
}
}
})
