小程序模拟领红包

由于开红包和领红包位于一个位置，可用绝对定位来处理！
html

<!-- 弹出层 -->
<view class="{{hiddenMask ? 'common_mask_hidden' : 'common_mask'}}" catch:tap="closeMask" catch:touchmove="_stopTap">
    <!-- 内容层 -->
    <view class="{{openPacket ? 'mask_box_hidden' : 'mask_box'}}">
        <view class="content" catch:tap="_stopTap">
            <view class="bg-box">
                <image class="bg-img" src="/images/index/packet_bg.png" />
                <view class="do-box">
                    <image class="do-img" catch:tap="openPacket" src="/images/index/packet_do.png" />
                    <image class="do-img" catch:tap="openPacket" src="/images/index/packet_do.png" />
                    <image class="do-img" catch:tap="openPacket" src="/images/index/packet_do.png" />
                </view>
            </view>
            <view class="close-box" catch:tap="closeMask">
                <image class="close-img" src="/images/index/packet_close.png" />
            </view>
        </view>
    </view>
    <view class="{{openPacket ? 'open_mask_box' : 'open_mask_box_hidden'}}">
        <view class="content" catch:tap="_stopTap">
            <view class="open-box">
                <image class="open-img" src="/images/index/packet_open.png" />
                <view class="show-box">
                    恭喜获得{{packet_money}}元
                </view>

                <view class="get-box" bind:tap="getPacket">
                    领到会员卡余额
                </view>
            </view>
        </view>
    </view>
</view>

css

/** 弹出核销码 **/
.common_mask {
  background-color: rgba(0, 0, 0, 0.5);
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 99999;
  transition: transform 0.3s ease-in-out;
  .mask_box {
    // 控制垂直居中
    position: absolute;
    left:40rpx;
    top: 300rpx;
    display: flex;
    height: 100%;

    .content {
      // 控制水平居中
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      .bg-box {
        .bg-img {
           672rpx;
          height: 429rpx;
        }
        position: relative;
        .do-box {
          position: absolute;
          top:165rpx;
          left:76rpx;
          // background-color: blue;
          margin:0 auto;
           520rpx;
          display: flex;
          justify-content: space-between;
          .do-img {
             150rpx;
            height: 200rpx;
          }
        }
      }

      .close-box {
        text-align: center;
        .close-img {
           62rpx;
          height: 85rpx;
        }
      }
    }
  }

  .mask_box_hidden {
    @extend .mask_box;
    visibility: hidden;
  }

  .open_mask_box {
    // 控制垂直居中
    position: absolute;
    left:43rpx;
    top: 100rpx;
    display: flex;
    height: 100%;

    .content {
      // 控制水平居中
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      .open-box {
        .open-img {
           690rpx;
          height: 905rpx;
        }
        position: relative;
        .show-box {
          position: absolute;
          top:295rpx;
          left:110rpx;
          text-align: center;

          450rpx;
          height:71rpx;
          font-size:71rpx;
          font-family:35--Regular;
          font-weight:400;
          color:rgba(218,49,65,1);
          line-height:71rpx;
        }
        .get-box {
          position: absolute;
          top:665rpx;
          left:96rpx;
          text-align: center;
          480rpx;
          height:102rpx;
          background:rgba(255,209,32,1);
          box-shadow:3rpx 4rpx 0px 0px rgba(203,165,18,0.75);
          border-radius:50rpx;
          font-size:40rpx;
          font-family:PingFang SC;
          font-weight:bold;
          color:rgba(218,49,65,1);
          line-height:102rpx;
        }
      }
    }
  }

  .open_mask_box_hidden {
    @extend .open_mask_box;
    visibility: hidden;
  }
}

.common_mask_hidden {
  @extend .common_mask;
  transform: translateY(100%);
  visibility: hidden;
}

js

  data: {
    hiddenMask: true,
    openPacket: false,
    packet_money: 0,
    lock_flag: false,
  },
  _stopTap() {
    return;
  },
  openPacket() {
    // 获取红包
    const openid = app.globalData.openid || Storage.get().openid;
    request("receivePacket", { openid })
      .then(({ data }) => {

        var that = this;
        that.setData({ openPacket: true, packet_money: data });
      })
      .catch(({ errdesc }) => {
        return tips.showMsg(errdesc);
      });

  },
  getPacket() {
    // 获取红包
    const openid = app.globalData.openid || Storage.get().openid;
    let that = this;
    if (that.data.lock_flag) {
      return;
    }

    that.setData({
      lock_flag: true
    });
    request("getPacket", { openid })
      .then(() => {
        tips.showMsg('领取成功');
        setTimeout(function () {
          that.closeMask();
          that.onShow();
        }, 1000);

      })
      .catch(({ errdesc }) => {
        that.setData({
          lock_flag: false
        });
        return tips.showMsg(errdesc);
      });
  },
  closeMask() {
    var that = this;
    that.onShow();
    that.setData({ hiddenMask: true, openPacket: false });
    wx.showTabBar();
  },
  showMask() {
    var that = this;
    that.setData({ hiddenMask: false });
    wx.hideTabBar();
  }

通过几个变量，可以灵活的控制内容展示。