<button class="show-btn" bindtap="showDialogBtn">弹窗</button>

<!--弹窗-->
<view class="modal-mask" bindtap="hideModal" catchtouchmove="preventTouchMove" wx:if="{{showModal}}"></view>
<view class="modal-dialog" wx:if="{{showModal}}">
 <view class="modal-title">添加数量</view>
 <view class="modal-content">
 <view class="modal-input">
  <input placeholder-class="input-holder" type="number" maxlength="10" bindinput="inputChange" class="input" placeholder="请输入数量"></input>
 </view>
 </view>
 <view class="modal-footer">
 <view class="btn-cancel" bindtap="onCancel" data-status="cancel">取消</view>
 <view class="btn-confirm" bindtap="onConfirm" data-status="confirm">确定</view>
 </view>
</view>

.show-btn {
 margin-top: 100rpx;
 color: #22cc22;
}

.modal-mask {
 width: 100%;
 height: 100%;
 position: fixed;
 top: 0;
 left: 0;
 background: #000;
 opacity: 0.5;
 overflow: hidden;
 z-index: 9000;
 color: #fff;
}

.modal-dialog {
 width: 540rpx;
 overflow: hidden;
 position: fixed;
 top: 50%;
 left: 0;
 z-index: 9999;
 background: #f9f9f9;
 margin: -180rpx 105rpx;
 border-radius: 36rpx;
}

.modal-title {
 padding-top: 50rpx;
 font-size: 36rpx;
 color: #030303;
 text-align: center;
}

.modal-content {
 padding: 50rpx 32rpx;
}

.modal-input {
 display: flex;
 background: #fff;
 border: 2rpx solid #ddd;
 border-radius: 4rpx;
 font-size: 28rpx;
}


.input {
 width: 100%;
 height: 82rpx;
 font-size: 28rpx;
 line-height: 28rpx;
 padding: 0 20rpx;
 box-sizing: border-box;
 color: #333;
}

input-holder {
 color: #666;
 font-size: 28rpx;
}

.modal-footer {
 display: flex;
 flex-direction: row;
 height: 86rpx;
 border-top: 1px solid #dedede;
 font-size: 34rpx;
 line-height: 86rpx;
}

.btn-cancel {
 width: 50%;
 color: #666;
 text-align: center;
 border-right: 1px solid #dedede;
}

.btn-confirm {
 width: 50%;
 color: #ec5300;
 text-align: center;
}

Page({
 data: {
  showModal: false,
 },
 onLoad: function () {
 },
 /**
  * 弹窗
  */
 showDialogBtn: function() {
  this.setData({
  showModal: true
  })
 },
 /**
  * 弹出框蒙层截断touchmove事件
  */
 preventTouchMove: function () {
 },
 /**
  * 隐藏模态对话框
  */
 hideModal: function () {
  this.setData({
  showModal: false
  });
 },
 /**
  * 对话框取消按钮点击事件
  */
 onCancel: function () {
  this.hideModal();
 },
 /**
  * 对话框确认按钮点击事件
  */
 onConfirm: function () {
  this.hideModal();
 }
})

showDialogBtn: function() {
  this.setData({
  showModal: true
  })
 }

hideModal: function () {
  this.setData({
  showModal: false
  });
 }

preventTouchMove: function () {
 }