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.jsPage({ 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  }); }})