微信小程序实现左滑动删除效果

<view class="touch-item {{item.isTouchMove ? 'touch-move-active' : ''}}" data-index=" {{index}}" bindtouchstart="touchstart" bindtouchmove="touchmove" wx:for="{{items}}" wx:key=""> <view class="content">  <view class='com'>  <view class='tp'>   <image src="{{item.image_src}}" class='img' />  </view>  <view class='txt'>   <view class='tit'>{{item.goods_name}}</view>   <view class='bot'>   <block wx:if="{{item.marketable=='true'}}">    <view class="pri">    <text class="new-price">￥{{item.goods_price}}</text>    <text class="old-price">￥{{item.mktprice}}</text>    </view>    <navigator class='a'>    <label class='ti1'>可使用优惠券</label>    </navigator>   </block>   <block wx:else>    <navigator class='a'>    <label class='ti'>对不起该商品已下架</label>    </navigator>   </block>   </view>  </view>  </view> </view><view class="del" catchtap="del" data-index="{{index}}" data-productid="{{item.product_id}}" data-goodsid="{{item.goods_id}}">删除</view></view>

 data: {  startX: 0, //开始坐标  startY: 0 }, touchstart: function(e) { //开始触摸时 重置所有删除 this.data.items.forEach(function(v, i) {  if (v.isTouchMove) //只操作为true的  v.isTouchMove = false; }) this.setData({  startX: e.changedTouches[0].clientX,  startY: e.changedTouches[0].clientY,  items: this.data.items }) }, //滑动事件处理 touchmove: function(e) { var that = this,  index = e.currentTarget.dataset.index, //当前索引  startX = that.data.startX, //开始X坐标  startY = that.data.startY, //开始Y坐标  touchMoveX = e.changedTouches[0].clientX, //滑动变化坐标  touchMoveY = e.changedTouches[0].clientY, //滑动变化坐标  //获取滑动角度  angle = that.angle({  X: startX,  Y: startY  }, {  X: touchMoveX,  Y: touchMoveY  }); that.data.items.forEach(function(v, i) {  v.isTouchMove = false  //滑动超过30度角 return  if (Math.abs(angle) > 30) return;  if (i == index) {  if (touchMoveX > startX) //右滑   v.isTouchMove = false  else //左滑   v.isTouchMove = true  } }) //更新数据 that.setData({  items: that.data.items }) }, /** * 计算滑动角度 * @param {Object} start 起点坐标 * @param {Object} end 终点坐标 */ angle: function(start, end) { var _X = end.X - start.X,  _Y = end.Y - start.Y //返回角度 /Math.atan()返回数字的反正切值 return 360 * Math.atan(_Y / _X) / (2 * Math.PI); },

.touch-item { background-color: #fff; margin-top: 20rpx; display: flex; justify-content: space-between; width: 100%; overflow: hidden; box-sizing: border-box;}.content { width: 100%; -webkit-transition: all 0.4s; transition: all 0.4s; -webkit-transform: translateX(180rpx); transform: translateX(180rpx); margin-left: -180rpx;}.touch-move-active .content, .touch-move-active .del { -webkit-transform: translateX(0); transform: translateX(0);}.com { padding: 25rpx; height: 210rpx;}.tp { background-color: white; float: left;}.img { width: 210rpx; height: 210rpx; display: inline-block; vertical-align: middle; border-radius: 15rpx;}.txt { width: 420rpx; margin-left: 270rpx; position: relative;}.txt .tit { font-size: 28rpx; display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2; overflow: hidden;}.txt .bot { width: 100%; font-size: 24rpx; margin-top: 20rpx;}.ti1 { margin-top: 15rpx; font-size: 23rpx; background-color: #fce64c; padding: 10rpx; display: inline-block;}.ti { margin-top: 35rpx; font-size: 28rpx; display: inline-block; color: #a2a2a2;}.del { background-color: red; width: 180rpx; display: flex; flex-direction: column; align-items: center; justify-content: center; color: #fff; -webkit-transform: translateX(180rpx); transform: translateX(180rpx); -webkit-transition: all 0.4s; transition: all 0.4s;}.new-price { font-weight: 600; color: #ff503c; font-size: 35rpx;}.old-price { margin-left: 30rpx; text-decoration: line-through; font-size: 28rpx; color: #b1b1b1;}