<view class="touch-item {{item.isTouchMove ? 'touch-move-active' : ''}}" data-index="{{index}}" wx:for="{{list}}" wx:key>
　　<view class="content">
　　　　<view style="{{item.txtStyle}}" class='item' data-index='{{index}}' bindtouchstart="touchstart" bindtouchmove="touchmove" bindtouchend="touchE">
　　　　<view class='title'>{{item.title}}</view>
　　　　<text>{{item.create_time}}</text>
　　</view>
</view>

<view class="del" data-id="{{item.id}}" catchtap="delBtn" data-index="{{index}}">刪除</view>
</view>

.touch-item {
　　display: flex;
　　justify-content: space-between;
　　width: 100%;
　　overflow: hidden;
　　margin-bottom: 10rpx;
　　background: #f5f5f5;
　　height: 216rpx;
}

.content {
　　width: 100%;
　　margin-right: 0;
　　-webkit-transition: all 0.4s;
　　transition: all 0.4s;
　　-webkit-transform: translateX(90px);
　　transform: translateX(90px);
　　margin-left: -90px;
}

.del {
　　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;
　　font-size: 35rpx;
}

.touch-move-active .content, .touch-move-active .del {
　　-webkit-transform: translateX(0);
　　transform: translateX(0);
}

// pages/touch/touch.js
Page({

  /**
* 頁(yè)面的初始數(shù)據(jù)
*/
  data: {
    startX: 0,
    //開(kāi)始坐標(biāo)
    startY: 0,
    page: 1,
    list: [{
      id: 0,
      title: '標(biāo)題1',
      create_time: '2019-09-06'
    },
    {
      id: 1,
      title: '標(biāo)題2',
      create_time: '2019-09-06'
    },
    {
      id: 2,
      title: '標(biāo)題3',
      create_time: '2019-09-06'
    },
    ]
  },
  touchE: function(e) {
    // console.log(e);
    var that = this
    if (e.changedTouches.length == 1) {
      //手指移動(dòng)結(jié)束后觸摸點(diǎn)位置的X坐標(biāo)
      var endX = e.changedTouches[0].clientX;
      //觸摸開(kāi)始與結(jié)束，手指移動(dòng)的距離
      var disX = that.data.startX - endX;
      var delBtnWidth = that.data.delBtnWidth;
      //如果距離小于刪除按鈕的1/2，不顯示刪除按鈕
      var txtStyle = disX > delBtnWidth / 2 ? "left:-" + delBtnWidth + "rpx": "left:0rpx";

      //獲取手指觸摸的是哪一項(xiàng)
      var index = e.currentTarget.dataset.index;
      var list = that.data.list;
      list[index].txtStyle = txtStyle;
      //更新列表的狀態(tài)
      that.setData({
        list: list
      });
    }
  },
  //手指觸摸動(dòng)作開(kāi)始 記錄起點(diǎn)X坐標(biāo)
  touchstart: function(e) {
    //開(kāi)始觸摸時(shí) 重置所有刪除
    this.data.list.forEach(function(v, i) {
      if (v.isTouchMove) //只操作為true的
      v.isTouchMove = false;
    }) this.setData({
      startX: e.changedTouches[0].clientX,
      startY: e.changedTouches[0].clientY,
      list: this.data.list
    })
  },
  //滑動(dòng)事件處理
  touchmove: function(e) {
    var that = this,
    index = e.currentTarget.dataset.index,
    //當(dāng)前索引
    startX = that.data.startX,
    //開(kāi)始X坐標(biāo)
    startY = that.data.startY,
    //開(kāi)始Y坐標(biāo)
    touchMoveX = e.changedTouches[0].clientX,
    //滑動(dòng)變化坐標(biāo)
    touchMoveY = e.changedTouches[0].clientY,
    //滑動(dòng)變化坐標(biāo)
    //獲取滑動(dòng)角度
    angle = that.angle({
      X: startX,
      Y: startY
    },
    {
      X: touchMoveX,
      Y: touchMoveY
    });
    that.data.list.forEach(function(v, i) {
      v.isTouchMove = false
      //滑動(dòng)超過(guò)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
      }
    })
    //更新數(shù)據(jù)
    that.setData({
      list: that.data.list
    })
  },
  /**
* 計(jì)算滑動(dòng)角度
* @param {Object} start 起點(diǎn)坐標(biāo)
* @param {Object} end 終點(diǎn)坐標(biāo)
*/
  angle: function(start, end) {
    var _X = end.X - start.X,
    _Y = end.Y - start.Y
    //返回角度 /Math.atan()返回?cái)?shù)字的反正切值
    return 360 * Math.atan(_Y / _X) / (2 * Math.PI);
  },
  /**
* 生命周期函數(shù)--監(jiān)聽(tīng)頁(yè)面加載
*/
  onLoad: function(options) {
},
  /**
* 生命周期函數(shù)--監(jiān)聽(tīng)頁(yè)面初次渲染完成
*/
  onReady: function() {
},
  /**
* 生命周期函數(shù)--監(jiān)聽(tīng)頁(yè)面顯示
*/
  onShow: function() {
},
  /**
* 生命周期函數(shù)--監(jiān)聽(tīng)頁(yè)面隱藏
*/
  onHide: function() {
},
  /**
* 生命周期函數(shù)--監(jiān)聽(tīng)頁(yè)面卸載
*/
  onUnload: function() {
},
  /**
* 頁(yè)面相關(guān)事件處理函數(shù)--監(jiān)聽(tīng)用戶(hù)下拉動(dòng)作
*/
  onPullDownRefresh: function() {
},
  /**
* 頁(yè)面上拉觸底事件的處理函數(shù)
*/
  onReachBottom: function() {
},
  /**
* 用戶(hù)點(diǎn)擊右上角分享
*/
  onShareAppMessage: function() {
}
})