微信小程序实现运动步数排行（可删除）

<!-- 向左滑动删除功能 -->
<view class="item-box">
  <view class="items">
    <view wx:for="{{list}}"  wx:key="{{index}}"  class="item">
     
      <view bindtouchstart="touchS" bindtouchmove="touchM" bindtouchend="touchE" data-index="{{index}}" style="{{item.txtStyle}}" class="inner txt">
      <i>{{item.rank}}</i>
      <image class="item-icon" mode="widthFix" src="{{item.icon}}"></image>
       <i> {{item.name}}</i>
      <span class="item-data">
    
       <i class="rankpace"> {{item.pace}}</i>
        <!-- <span class="rankxin">{{item.xin}}</span> -->
      </span>
      
      </view>
     
      <view data-index="{{index}}" bindtap = "delItem" class="inner del">删除</view>
    </view>
  </view>
</view>

/* pages/leftSwiperDel/index.wxss */
view{
    box-sizing: border-box;
}
.item-box{
    width: 700rpx;
    margin: 0 auto;
    padding:40rpx 0;
}
.items{
    width: 100%;
}
.item{
    position: relative;
    border-top: 2rpx solid #eee;
    height: 120rpx;
    line-height: 120rpx;
    overflow: hidden;
     
}


.item:last-child{
    border-bottom: 2rpx solid #eee;
}
.inner{
    position: absolute;
    top:0;
}
.inner.txt{
    background-color: #fff;
    width: 100%;
    z-index: 5;
    padding:0 10rpx;
    transition: left 0.2s ease-in-out;
    white-space:nowrap;
    overflow:hidden;
    text-overflow:ellipsis;
}
.inner.del{
    background-color: #e64340;
    width: 180rpx;text-align: center;
    z-index: 4;
    right: 0;
    color: #fff
}
.item-icon{
    width: 64rpx;
    height: 64rpx;
    vertical-align: middle;
    margin-right: 16rpx;
    margin-left:13px;
    border-radius:50%;

}

.item-data{
  float: right;
  margin-right:5%;}

.rankpace{
  color: #fa7e04;
}

// pages/leftSwiperDel/index.js
Page({
  data: {
    delBtnWidth: 180//删除按钮宽度单位（rpx）
  },
  onLoad: function (options) {
    // 页面初始化 options为页面跳转所带来的参数
    this.initEleWidth();
    this.tempData();
  },
  onReady: function () {
    // 页面渲染完成
  },
  onShow: function () {
    // 页面显示
  },
  onHide: function () {
    // 页面隐藏
  },
  onUnload: function () {
    // 页面关闭
  },
  touchS: function (e) {
    if (e.touches.length == 1) {
      this.setData({
        //设置触摸起始点水平方向位置
        startX: e.touches[0].clientX
      });
    }
  },
  touchM: function (e) {
    if (e.touches.length == 1) {
      //手指移动时水平方向位置
      var moveX = e.touches[0].clientX;
      //手指起始点位置与移动期间的差值
      var disX = this.data.startX - moveX;
      var delBtnWidth = this.data.delBtnWidth;
      var txtStyle = "";
      if (disX == 0 || disX < 0) {//如果移动距离小于等于0，文本层位置不变
        txtStyle = "left:0px";
      } else if (disX > 0) {//移动距离大于0，文本层left值等于手指移动距离
        txtStyle = "left:-" + disX + "px";
        if (disX >= delBtnWidth) {
          //控制手指移动距离最大值为删除按钮的宽度
          txtStyle = "left:-" + delBtnWidth + "px";
        }
      }
      //获取手指触摸的是哪一项
      var index = e.target.dataset.index;
      var list = this.data.list;
      list[index].txtStyle = txtStyle;
      //更新列表的状态
      this.setData({
        list: list
      });
    }
  },

  touchE: function (e) {
    if (e.changedTouches.length == 1) {
      //手指移动结束后水平位置
      var endX = e.changedTouches[0].clientX;
      //触摸开始与结束，手指移动的距离
      var disX = this.data.startX - endX;
      var delBtnWidth = this.data.delBtnWidth;
      //如果距离小于删除按钮的1/2，不显示删除按钮
      var txtStyle = disX > delBtnWidth / 2 ? "left:-" + delBtnWidth + "px" : "left:0px";
      //获取手指触摸的是哪一项
      var index = e.target.dataset.index;
      var list = this.data.list;
      list[index].txtStyle = txtStyle;
      //更新列表的状态
      this.setData({
        list: list
      });
    }
  },
  //获取元素自适应后的实际宽度
  getEleWidth: function (w) {
    var real = 0;
    try {
      var res = wx.getSystemInfoSync().windowWidth;
      var scale = (750 / 2) / (w / 2);//以宽度750px设计稿做宽度的自适应
      // console.log(scale);
      real = Math.floor(res / scale);
      return real;
    } catch (e) {
      return false;
      // Do something when catch error
    }
  },
  initEleWidth: function () {
    var delBtnWidth = this.getEleWidth(this.data.delBtnWidth);
    this.setData({
      delBtnWidth: delBtnWidth
    });
  },
  //点击删除按钮事件
  delItem: function (e) {
    //获取列表中要删除项的下标
    var index = e.target.dataset.index;
    var list = this.data.list;
    //移除列表中下标为index的项
    list.splice(index, 1);
    //更新列表的状态
    this.setData({
      list: list
    });
  },
  //测试临时数据
  tempData: function () {
    var list = [
      {
        rank: "1",
        txtStyle: "",
        icon: "/images/my.png",
        name: "李飞",
       pace: "23456",

       
      },
      {
        rank: "2",
        txtStyle: "",  
        icon: "/images/my.png",
        name: "张叶",
        pace: "23450",
     
      },
      {
        rank: "3",
        txtStyle: "",
        icon: "/images/my.png",
        name: "王小婷",
        pace: "22345",
     
      },
      {
        rank: "4",
        txtStyle: "",
        icon: "/images/my.png",
        name: "袁经理",
        pace: "21687",
   
      },
      {
        rank: "5",
        txtStyle: "",
        icon: "/images/my.png",
        name: "陈雅婷",
        pace: "21680",
   
      },
      {
        rank: "6",
        txtStyle: "",
        icon: "/images/my.png",
        name: "许安琪",
        pace: "20890",
     
      },
      {
        rank: "7",
        txtStyle: "",
        icon: "/images/my.png",
        name: "里俊飞",
        pace: "20741",
     
      },
      {
        rank: "8",
        txtStyle: "",
        icon: "/images/my.png",
        name: "李小俊",
        pace: "19511",
      
      },
      {
        rank: "9",
        txtStyle: "",
        icon: "/images/my.png",
        name: "陈俊飞",
        pace: "19501",
       
      },]
    
  

    //
    this.setData({
      list: list
    });
  }

})