微信小程序实现运动步数排行功能（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
  });
 }
})