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微信小程序实现运动步数排行(可删除)

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wxml<!– 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>wxss/* 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;}js// 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    });  }})

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