微信小程序 按钮滑动的实现方法

<view class="content">  <view class="sliderContent">    <input placeholder="验证码" placeholder-class="input-placeholder" disabled="{{disabled}}" />    <view class="slider" bindtouchstart="moveSendBtnStart" bindtouchend="moveSendBtnEnd" bindtouchmove="moveSendBtn" style="left:{{moveSendBtnLeft}}rpx;background-color:{{SendBtnColor}}">发送</view>  </view></view>

.content {  margin-top: 100rpx;  font-size: 24rpx;}.sliderContent{  position: relative;  margin: 0 auto;  margin-bottom: 50rpx;  padding-left: 60rpx;  width: 425rpx;  box-sizing: border-box;  height: 70rpx;  line-height: 70rpx;  border-radius: 60rpx;  background-color: #fff;  color: #289adc;  box-shadow: 0px 4px 6px 0px rgba(37, 114, 219, 0.3);}.sliderContent input {  line-height: 70rpx;  height: 70rpx;  box-sizing: border-box;  padding-left: 40rpx;  width: 250rpx;}.input-placeholder {  text-align: center;  color: #289adc;} .slider {  position: absolute;  top: 0;  left: 0;  width: 150rpx;  border-radius: 60rpx;  text-align: center;  background-color: #7f7f7f;  color: #fff;  box-shadow: 0px 4px 6px 0px rgba(37, 114, 219, 0.3);}

Page({  data: {    moveStartX: 0, //起始位置    moveSendBtnLeft: 0, //发送按钮的left属性    moveEndX: 0, //结束位置    screenWidth: 0, //屏幕宽度    moveable: true, //是否可滑动    disabled: true,//验证码输入框是否可用,    SendBtnColor: "#7f7f7f" //滑动按钮颜色  },  onLoad: function () {    var that = this;    // 获取屏幕宽度    wx.getSystemInfo({      success: function (res) {        that.setData({          screenWidth: res.screenWidth        })      },    })  },  //  开始移动  moveSendBtnStart: function (e) {    if (!this.data.moveable) {      return;    }    console.log("start");    console.log(e);    this.setData({      moveStartX: e.changedTouches["0"].clientX    })  },  //移动发送按钮  moveSendBtn: function (e) {    if (!this.data.moveable) {      return;    }    var that = this;    // console.log(e.touches[0]);    var left = ((e.touches[0].clientX - that.data.moveStartX) / (that.data.screenWidth / 750))    console.log(left)    if (left <= 275.5) {      this.setData({        moveSendBtnLeft: left      })    } else {      this.setData({        moveSendBtnLeft: 275.5      })    }  },  // 结束移动  moveSendBtnEnd: function (e) {    console.log("end");    var that = this;    var left = ((e.changedTouches[0].clientX - that.data.moveStartX) / (that.data.screenWidth / 750))    console.log(left);    if (left < 275.5) {      for (let i = left; i >= 0; i--) {        that.setData({          moveSendBtnLeft: i        })      }    } else {      that.setData({        moveEndX: e.changedTouches[0].clientX,        moveable: false,        disabled: false,        SendBtnColor: "#289adc"      })    }  }})