实现微信小程序中的滑动删除功能

<view class="list">
  <block wx:for="{{listData}}" wx:for-item="item" wx:key="{{index}}">
    <view class="list-item" 
      animation="{{item.animation}}" 
      bindtouchstart="touchStart" 
      bindtouchmove="touchMove" 
      bindtouchend="touchEnd" 
      data-index="{{index}}">
      <view>{{item.title}}</view>
      <view class="btn-delete" bindtap="deleteItem" wx:if="{{item.showDel}}">删除</view>
    </view>
  </block>
</view>

.list{
  padding: 20rpx;
}

.list-item{
  position: relative;
  height: 100rpx;
  line-height: 100rpx;
  background-color: #ffffff;
  margin-bottom: 20rpx;
  overflow: hidden;
}

.btn-delete{
  position: absolute;
  top: 0;
  right: 0;
  width: 120rpx;
  height: 100rpx;
  background-color: #f5222d;
  color: #ffffff;
  line-height: 100rpx;
  text-align: center;
  transition: all 0.2s;
  transfORM: translateX(120rpx);
}

.list-item:hover .btn-delete{
  transform: translateX(0);
}

Page({
  data: {
    listData: [
      { title: '列表项1', showDel: false, animation: '' },
      { title: '列表项2', showDel: false, animation: '' },
      { title: '列表项3', showDel: false, animation: '' },
      // 其他列表项...
    ],
    startX: 0, // 手指起始X坐标
    startY: 0, // 手指起始Y坐标
    activeIndex: -1, // 激活的列表项索引
  },

  touchStart(e) {
    this.data.activeIndex = e.currentTarget.dataset.index;
    this.data.startX = e.touches[0].clientX;
    this.data.startY = e.touches[0].clientY;
  },

  touchMove(e) {
    let index = e.currentTarget.dataset.index;
    let startX = this.data.startX;
    let startY = this.data.startY;
    let deltaX = e.touches[0].clientX - startX;
    let deltaY = e.touches[0].clientY - startY;

    // 水平滑动大于竖直滑动
    if (Math.abs(deltaX) > Math.abs(deltaY)) {
      // 滑动方向向右
      if (deltaX > 30) {
        this.showDelete(index);
      }
      // 滑动方向向左
      else if (deltaX < -30) {
        this.hideDelete();
      }
    }
  },

  touchEnd(e) {
    this.data.startX = 0;
    this.data.startY = 0;
  },

  showDelete(index) {
    let listData = this.data.listData;
    listData[index].showDel = true;
    listData[index].animation = 'animation: showDelete 0.2s;';
    this.setData({
      listData: listData
    });
  },

  hideDelete() {
    let listData = this.data.listData;
    listData[this.data.activeIndex].showDel = false;
    listData[this.data.activeIndex].animation = '';
    this.setData({
      listData: listData
    });
  },

  deleteItem(e) {
    let index = e.currentTarget.dataset.index;
    let listData = this.data.listData;
    listData.splice(index, 1);
    this.setData({
      listData: listData
    });
  }
})