通过vue方式实现二维码扫码功能

// qrcode.vue
<template>
  <div>
      <!-- <p class="error">{{ error }}</p> -->
      <!--错误信息-->

      <!-- <p class="decode-result">
          扫描结果:
          <b>{{ result }}</b>
      </p> -->
      <!--扫描结果-->
      <!-- <p @click="openCamera">打开相机</p>
      <div v-show="show" class="cameraMessage">
          <p @click="closeCamera">关闭相机</p>
          <p @click="openFlash">打开手电筒</p>
          <p @click="switchCamera">相机反转</p>
      </div> -->

      <qrcode-stream
          v-show="qrcode"
          :camera="camera"
          :torch="torchActive"
          @decode="onDecode"
          @init="onInit"
      >
          <div>
              <div class="qr-scanner">
                  <div class="box">
                      <div class="line"></div>
                      <div class="angle"></div>
                  </div>
                  <div class="txt">
                      将二维码/条码放入框内，即自动扫描
                      <div class="myQrcode">我的二维码</div>
                  </div>
              </div>
          </div>
      </qrcode-stream>
  </div>
</template>

<script>
// 下载插件
// cnpm install --save  vue-qrcode-reader

// 引入
import { QrcodeStream } from 'vue-qrcode-reader';

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

  data() {
      return {
          result: '', // 扫码结果信息
          error: '', // 错误信息
          // show: false,
          // qrcode: false,
          qrcode: true,
          torchActive: false,
          camera: 'front',
      };
  },

  methods: {
      onDecode(result) {
          console.log(result);
          this.result = result;
      },
      async onInit(promise) {
          const { capabilities } = await promise;

          const TORCH_IS_SUPPORTED = !!capabilities.torch;
          try {
              await promise;
          } catch (error) {
              if (error.name === 'NotAllowedError') {
                  this.error = 'ERROR: 您需要授予相机访问权限';
              } else if (error.name === 'NotFoundError') {
                  this.error = 'ERROR: 这个设备上没有摄像头';
              } else if (error.name === 'NotSupportedError') {
                  this.error = 'ERROR: 所需的安全上下文(HTTPS、本地主机)';
              } else if (error.name === 'NotReadableError') {
                  this.error = 'ERROR: 相机被占用';
              } else if (error.name === 'OverconstrainedError') {
                  this.error = 'ERROR: 安装摄像头不合适';
              } else if (error.name === 'StreamapiNotSupportedError') {
                  this.error = 'ERROR: 此浏览器不支持流API';
              }
          }
      },
      // 打开相机
      // openCamera() {
      //     this.camera = 'rear'
      //     this.qrcode = true
      //     this.show = true
      // },
      // 关闭相机
      // closeCamera() {
      //     this.camera = 'off'
      //     this.qrcode = false
      //     this.show = false
      // },
      // 打开手电筒
      // openFlash() {
      //     switch (this.torchActive) {
      //         case true:
      //             this.torchActive = false
      //             break
      //         case false:
      //             this.torchActive = true
      //             break
      //     }
      // },
      // 相机反转
      // switchCamera() {
      //     // console.log(this.camera);
      //     switch (this.camera) {
      //         case 'front':
      //             this.camera = 'rear'
      //             console.log(this.camera)
      //             break
      //         case 'rear':
      //             this.camera = 'front'
      //             console.log(this.camera)
      //             break
      //     }
      // }
  },
};
</script>
<style scoped>
.error {
  font-weight: bold;
  color: red;
}
.cameraMessage {
  width: 100%;
  height: 60px;
}
.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: 100vh;
  
  position: relative;
  background-color: #1110;

  
}


.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);
  
}
.qr-scanner .txt {
  width: 100%;
  height: 35px;
  line-height: 35px;
  font-size: 14px;
  text-align: center;
  
  margin: 0 auto;
  position: absolute;
  top: 70%;
  left: 0;
}
.qr-scanner .myQrcode {
  text-align: center;
  color: #00ae10;
}
.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>

// 
import qrcode from '@/components/qrcode.vue';

// 
components: {
        'vue-qrcode': qrcode,
    },

// 在需要展示二维码的地方进行渲染
<vue-qrcode />
//如果上面这个不好使，可以用下面这个
<vue-qrcode></vue-qrcode>