/**scan.wxss**/
.scan-view {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  background-color: #B9BEC4;
  position: fixed;
  align-items: center;
  justify-content: space-around;
}
 
.scan-border {
  width: 94%;
  height: 94%;
  border: 6rpx solid #08FDFE;
  border-radius: 10rpx;
  display: flex;
  flex-direction: column;
  align-items: center;
}
 
.scan-camera {
  width: 500rpx;
  height: 500rpx;
  border-radius: 6rpx;
  margin: 30rpx;
}
 
.cover-corner {
  width: 80rpx;
  height: 80rpx;
  position: absolute;
}
 
.cover-left-top {
  left: 0;
  top: 0;
}
 
.cover-right-top {
  right: 0;
  top: 0;
}
 
.cover-left-bottom {
  left: 0;
  bottom: 0;
}
 
.cover-right-bottom {
  right: 0;
  bottom: 0;
}
 
.scan-animation {
  position: absolute;
  top: -10rpx;
  left: 10rpx;
  width: 480rpx;
  height: 8rpx;
  background-color: #08FDFE;
  border-radius: 50%;
}

<!--scan.wxml-->
<view class="scan-view">
  <view class='scan-border'>
    
    <camera class='scan-camera' mode="scanCode" binderror="cameraError" bindscancode='scancode' frame-size='large'>
      <cover-image class='cover-corner cover-left-top' src='/images/left-top.png'></cover-image>
      <cover-image class='cover-corner cover-right-top' src='/images/right-top.png'></cover-image>
      <cover-image class='cover-corner cover-left-bottom' src='/images/left-bottom.png'></cover-image>
      <cover-image class='cover-corner cover-right-bottom' src='/images/right-bottom.png'></cover-image>
      
      <cover-view class='scan-animation' animation="{{animation}}"></cover-view>
    </camera>
    <!-- 这里可以处理其他内容 -->
  </view>
</view>

// scan.js
// 移动动画
let animation = wx.createAnimation({});
// 提示音
let innerAudioContext = wx.createInnerAudioContext()
innerAudioContext.src = '/images/beep.mp3'
 
Page({
  data: {
    
  },
  onLoad: function () {
    
  },
  onShow(){
    this.donghua()
  },
  donghua(){
    var that = this;
    // 控制向上还是向下移动
    let m = true
    
    setInterval(function () {
      if (m) {
        animation.translateY(250).step({ duration: 3000 })
        m = !m;
      } else {
        animation.translateY(-10).step({ duration: 3000 })
        m = !m;
      }
 
      that.setData({
        animation: animation.export()
      })
    }.bind(this), 3000)
  },
  scancode(e){
    // 提示音
    innerAudioContext.play()
    // 校验扫描结果，并处理
    let res = e.detail.result
  }
})