<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"
      })
    }
  }


})