微信小程序左滑删除功能

效果图如下：

wxml代码：

 <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>

wxss代码：

 .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:;
  -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);
 }

js代码：

 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
   })
  }
 })

教程参考地址：http://www.jb51.net/article/108071.htm