小程序实现层叠卡片滑动效果

<!-- 轮播wxml代码 --><view class="teachers_banner"> <view class="lunbo_center clearfix teachers_b">  <view class="slide" id="slide" bindtouchstart='moveStart' bindtouchend='moveItem'>   <ul>    <block wx:for="{{datas}}" wx:key>     <li animation="{{item.animation}}" style="z-index: {{item.zIndex}} ;opacity:{{item.opacity}};"      bindtap="choose" data-id="{{item.id}}">      <image src="{{item.iamge}}" />     </li>    </block>   </ul>  </view> </view></view>

/*轮播图片*/.lunbo_center { display: flex; flex-direction: column; align-items: center; justify-content: space-between; padding: 50rpx 0; box-sizing: border-box;}.teachers_b { position: relative;}#slide { margin: 0 auto; width: 100%; height: 160px; position: relative;}#slide li { position: absolute; width: 600rpx; height: 300rpx; display: -webkit-box; display: -webkit-flex; display: flex; align-items: flex-start; -webkit-box-align: flex-start; -webkit-align-items: flex-start; background: #fff; overflow: hidden; box-shadow: 0 0 20px #1d374d;}#slide li image { width: 100%; height: 100%;}.slide_left { width: 240px;}.slide_right { padding: 40px; -webkit-box-flex: 1; -webkit-flex: 1; flex: 1; min-width: 0;}.slide_right h3 { font: 400 30px/18px "Microsoft Yahei"; color: #222;}.slide_right h3 span { display: inline-block; margin-left: 10px; font: 400 14px/36px "Microsoft Yahei"; color: #555;}.slide_right p { padding: 20px 0 30px; color: #555; font: 400 14px/24px "Microsoft Yahei"; border-bottom: 1px solid #dbdbdb;}.slide_right dl { padding-top: 30px;}.slide_right dd { /* float: left; */ width: 33.3%; color: #777; font: 400 12px/24px "Microsoft Yahei";}.slide_right dd h3 { color: #ff9000; margin-bottom: 20px;}.arrow { display: none;}.arrow .prev, .arrow .next { position: absolute; width: 64px; top: 38%; z-index: 9; font: 700 96px 'simsun'; opacity: 0.3; color: #fff; cursor: pointer;}.arrow .prev { left: -220px;}.arrow .next { right: -220px;}.arrow .prev:hover, .arrow .next:hover { color: #00a0e9; opacity: 0.7;}

// js代码Page({ /**  * 页面的初始数据  */ data: {  startX: 0,  endX: 0,  iCenter: 3,  datas: [{   id: 1,   zIndex: 2,   opacity: 0.2,   left: 10,   iamge: "../../icon/lunbo2.jpg",   animation: null  },  {   id: 2,   zIndex: 4,   opacity: 0.4,   left: 20,   iamge: "../../icon/lunbo3.jpg",   animation: null  },  {   id: 3,   zIndex: 6,   opacity: 0.6,   left: 30,   iamge: "../../icon/lunbo4.jpg",   animation: null  },  {   id: 4,   zIndex: 8,   opacity: 1,   left: 40,   iamge: "../../icon/lunbo1.jpg",   animation: null  },  {   id: 5,   zIndex: 6,   opacity: 0.6,   left: 50,   iamge: "../../icon/lunbo2.jpg",   animation: null  },  {   id: 6,   zIndex: 4,   opacity: 0.4,   left: 60,   iamge: "../../icon/lunbo3.jpg",   animation: null  } ,  {   id: 7,   zIndex: 2,   opacity: 0.2,   left: 70,   iamge: "../../icon/lunbo1.jpg",   animation: null  }  ],  order: [] }, /**  * 生命周期函数--监听页面加载  */ onLoad: function (options) {  this.__set__();  this.move(); }, move: function () {  var datas = this.data.datas;  /*图片分布*/  for (var i = 0; i < datas.length; i++) {   var data = datas[i];   var animation = wx.createAnimation({    duration: 100   });   animation.translateX(data.left).step();   this.setData({    ["datas[" + i + "].animation"]: animation.export(),    ["datas[" + i + "].zIndex"]: data.zIndex,    ["datas[" + i + "].opacity"]: data.opacity,   })  } }, /**左箭头 */ left: function () {  //  var last = this.data.datas.pop(); //获取数组的最后一个  this.data.datas.unshift(last);//放到数组的第一个  var orderFirst = this.data.order.shift();  this.data.order.push(orderFirst);  this.move(); }, /** */ right: function () {  var first = this.data.datas.shift(); //获取数组的第一个  this.data.datas.push(first);//放到数组的最后一个位置  var orderLast = this.data.order.pop();  this.data.order.unshift(orderLast);  this.move(); }, /**点击某项 */ choose: function (e) {  var that = this;  var id = e.currentTarget.dataset.id;  var order = that.data.order;  var index = 0;  for (var i = 0; i < order.length; i++) {   if (id == order[i]) {    index = i;    break;   }  }  if (index < that.data.iCenter) {   for (var i = 0; i < that.data.iCenter - index; i++) {    this.data.datas.push(this.data.datas.shift()); //获取第一个放到最后一个    this.data.order.unshift(this.data.order.pop());    // this.right()    }  } else if (index > that.data.iCenter) {   for (var i = 0; i < index - that.data.iCenter; i++) {    this.data.datas.unshift(this.data.datas.pop()); //获取最后一个放到第一个    this.data.order.push(this.data.order.shift());    // this.left();   }  }  this.move(); }, /**新的排列复制到新的数组中 */ __set__: function () {  var that = this;  var order = that.data.order;  var datas = that.data.datas;  for (var i = 0; i < datas.length; i++) {   that.setData({    ["order[" + i + "]"]: datas[i].id   })  } }, //手指触发开始移动 moveStart: function (e) {  console.log(e);  var startX = e.changedTouches[0].pageX;  this.setData({   startX: startX  }); }, //手指触摸后移动完成触发事件 moveItem: function (e) {  console.log(e);  var that = this;  var endX = e.changedTouches[0].pageX;  this.setData({   endX: endX  });  //计算手指触摸偏移剧距离  var moveX = this.data.startX - this.data.endX;  //向左移动  if (moveX > 20) {   this.left();  }  if (moveX < -20) {   this.right();  } },})