微信小程序 向左滑动删除功能的实现

<view class="container"> <view class="touch-item {{item.isTouchMove ? 'touch-move-active' : ''}}" data-index="{{index}}" bindtouchstart="touchstart" bindtouchmove="touchmove" wx:for="{{items}}" wx:key="">  <view class="content">{{item.content}}</view>  <view class="del" catchtap="del" data-index="{{index}}">删除</view> </view></view>

.touch-item { font-size: 14px; display: flex; justify-content: space-between; border-bottom:1px solid #ccc; width: 100%; overflow: hidden}.content { width: 100%; padding: 10px; line-height: 22px; margin-right:0; -webkit-transition: all 0.4s; transition: all 0.4s; -webkit-transform: translateX(90px); transform: translateX(90px); margin-left: -90px}.del { background-color: orangered; width: 90px; display: flex; flex-direction: column; align-items: center; justify-content: center; color: #fff; -webkit-transform: translateX(90px); transform: translateX(90px); -webkit-transition: all 0.4s; transition: all 0.4s;}.touch-move-active .content,.touch-move-active .del { -webkit-transform: translateX(0); transform: translateX(0);}

var app = getApp()Page({ data: {  items: [],  startX: 0, //开始坐标  startY: 0 }, onLoad: function () {  for (var i = 0; i < 10; i++) {   this.data.items.push({    content: i + " 向左滑动删除哦,向左滑动删除哦,向左滑动删除哦,向左滑动删除哦,向左滑动删除哦",    isTouchMove: false //默认全隐藏删除   })  }  this.setData({   items: this.data.items  }) }, //手指触摸动作开始 记录起点X坐标 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); }, //删除事件 del: function (e) {  this.data.items.splice(e.currentTarget.dataset.index, 1)  this.setData({   items: this.data.items  }) }})