Vue implements QR code scanning function (with style)

<template>
  <div>
    <p class="error">{{ error }}</p>
    <!--Error message-->

    <p class="decode-result">
      Scan Results:
      {{ result }}
    </p>
    <!--Scan Results-->

    <qrcode-stream @decode="onDecode" @init="onInit" style="height: 100vh;">
      <div>
        <div class="qr-scanner">
          <div class="box">
            <div class="line"></div>
            <div class="angle"></div>
          </div>
        </div>
      </div>
    </qrcode-stream>
  </div>
</template>

<script>
// Download the plugin // cnpm install --save vue-qrcode-reader

// Import import { QrcodeStream } from 'vue-qrcode-reader'

export default {
  // Register components: { QrcodeStream },

  data() {
    return {
      result: '', // Scan result information error: '' // Error message }
  },

  methods: {
    onDecode(result) {
      alert(result)
      this.result = result
    },

    async onInit(promise) {
      try {
        await promise
      } catch (error) {
        if (error.name === 'NotAllowedError') {
          this.error = 'ERROR: You need to grant camera access'
        } else if (error.name === 'NotFoundError') {
          this.error = 'ERROR: There is no camera on this device'
        } else if (error.name === 'NotSupportedError') {
          this.error = 'ERROR: Security context required (HTTPS, localhost)'
        } else if (error.name === 'NotReadableError') {
          this.error = 'ERROR: The camera is occupied'
        } else if (error.name === 'OverconstrainedError') {
          this.error = 'ERROR: Camera installation is inappropriate'
        } else if (error.name === 'StreamApiNotSupportedError') {
          this.error = 'ERROR: This browser does not support the streaming API'
        }
      }
    }
  }
}
</script>

<style scoped>
.error {
  font-weight: bold;
  color: red;
}
</style>

<style scoped>
    /* * {
      margin: 0;
      padding: 0;
    }
    body {
      height: 700px;
      margin: 0;
    } */

    .qr-scanner {
      background-image:
        linear-gradient(0deg,
          transparent 24%,
          rgba(32, 255, 77, 0.1) 25%,
          rgba(32, 255, 77, 0.1) 26%,
          transparent 27%,
          transparent 74%,
          rgba(32, 255, 77, 0.1) 75%,
          rgba(32, 255, 77, 0.1) 76%,
          transparent 77%,
          transparent),
        linear-gradient(90deg,
          transparent 24%,
          rgba(32, 255, 77, 0.1) 25%,
          rgba(32, 255, 77, 0.1) 26%,
          transparent 27%,
          transparent 74%,
          rgba(32, 255, 77, 0.1) 75%,
          rgba(32, 255, 77, 0.1) 76%,
          transparent 77%,
          transparent);
      background-size: 3rem 3rem;
      background-position: -1rem -1rem;
      width: 100%;
      /* height: 100%; */
      height: 100vh;
      position: relative;
      background-color: #1110;

      /* background-color: #111; */
    }

    .qr-scanner .box {
      width: 213px;
      height: 213px;
      position: absolute;
      left: 50%;
      top: 50%;
      transform: translate(-50%, -50%);
      overflow: hidden;
      border: 0.1rem solid rgba(0, 255, 51, 0.2);
      /* background: url('http://resource.beige.world/imgs/gongconghao.png') no-repeat center center; */
    }

    .qr-scanner .line {
      height: calc(100% - 2px);
      width: 100%;
      background: linear-gradient(180deg, rgba(0, 255, 51, 0) 43%, #00ff33 211%);
      border-bottom: 3px solid #00ff33;
      transform: translateY(-100%);
      animation: radar-beam 2s infinite alternate;
      animation-timing-function: cubic-bezier(0.53, 0, 0.43, 0.99);
      animation-delay: 1.4s;
    }

    .qr-scanner .box:after,
    .qr-scanner .box:before,
    .qr-scanner .angle:after,
    .qr-scanner .angle:before {
      content: '';
      display: block;
      position: absolute;
      width: 3vw;
      height: 3vw;

      border: 0.2rem solid transparent;
    }

    .qr-scanner .box:after,
    .qr-scanner .box:before {
      top: 0;
      border-top-color: #00ff33;
    }

    .qr-scanner .angle:after,
    .qr-scanner .angle:before {
      bottom: 0;
      border-bottom-color: #00ff33;
    }

    .qr-scanner .box:before,
    .qr-scanner .angle:before {
      left: 0;
      border-left-color: #00ff33;
    }

    .qr-scanner .box:after,
    .qr-scanner .angle:after {
      right: 0;
      border-right-color: #00ff33;
    }

    @keyframes radar-beam {
      0% {
        transform: translateY(-100%);
      }

      100% {
        transform: translateY(0);
      }
    }
  </style>

 <div class="scan">
    <div id="bcid">
      <div style="height:40%"></div>
      <p class="tip">...Loading...</p>
    </div>
    <footer>
      <button @click="startRecognize">1. Create a control</button>
      <button @click="startScan">2. Start scanning</button>
      <button @click="cancelScan">3. End scanning</button>

      <button @click="closeScan">4. Close the control</button>
    </footer>
  </div>
</template>

<script type='text/ecmascript-6'>
  let scan = null

  export default {
    data () {
      return {
        codeUrl: '',
      }
    },
    methods: {
      // Create a scanning control startRecognize () {
        let that = this
        if (!window.plus) return
        scan = new plus.barcode.Barcode('bcid')
        scan.onmarked = onmarked

        function onmarked (type, result, file) {
          switch (type) {
            case plus.barcode.QR:
              type = 'QR'
              break
            case plus.barcode.EAN13:
              type = 'EAN13'
              break
            case plus.barcode.EAN8:
              type = 'EAN8'
              break
            default:
              type = 'Other' + type
              break
          }
          result = result.replace(/\n/g, '')
          that.codeUrl = result
          alert(result)
          that.closeScan()

        }
      },
      // Start scanning startScan () {
        if (!window.plus) return
        scan.start()
      },
      // Close the scan cancelScan () {
        if (!window.plus) return
        scan.cancel()
      },
      // Close the barcode recognition control closeScan () {
        if (!window.plus) return
        scan.close()
      },
    }
  }
</script>
<style lang="less">
  .scan {
    height: 100%;

    #bcid {
      width: 100%;
      position: absolute;
      left: 0;
      right: 0;
      top: 0;
      bottom: 3rem;
      text-align: center;
      color: #fff;
      background: #ccc;
    }

    footer {
      position: absolute;
      left: 0;
      bottom: 1rem;
      height: 2rem;
      line-height: 2rem;
      z-index: 2;
    }
  }
</style>