h5-二维码扫码（二）

一、简介

采用vue-qrcode-reader方案，需要https协议，优点集成简单、底层依赖Zxing-js
功能强大、兼容pc/mac、android、iOS，缺点暂未发现

二、集成

1、通过npm引入

npm install vue-qrcode-reader

2、html直接引入

<script src="https://unpkg.com/vue-qrcode-reader/dist/VueQrcodeReader.umd.min.js" type="text/javascript">

3、使用

//局部引入
import { QrcodeStream, QrcodeDropZone, QrcodeCapture } from 'vue-qrcode-reader'

const MyComponent = {

  components: {
    QrcodeStream,
    QrcodeDropZone,
    QrcodeCapture
  },

  // ...
))

//全局引入
import Vue from "vue";
import VueQrcodeReader from "vue-qrcode-reader";

Vue.use(VueQrcodeReader);

三、例子（以下内容为CSDN博主「普通网友」的原创文章内容原文链接）

1、在components文件夹下面新建qrcode文件夹，并新建qrcode.vue，代码如下

<template>
    <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>
              </div>
          </div>
      </qrcode-stream>
  </div>
</template>

<script>
    
import { QrcodeStream } from 'vue-qrcode-reader';

export default {
  // 注册
  components: { 
      QrcodeStream 
  },
  data() {
      return {
          qrcode: true,
          torchActive: false, //手电筒
          camera: 'rear'// front, rear, auto, off,
      };
  },

  methods: {
      onDecode(result) {
          this.$emit('success', result);
      },
      async onInit(promise) {
          try {
              const { capabilities } = await promise;
              const TORCH_IS_SUPPORTED = !!capabilities.torch;
              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';
              }
              
              this.$toast(this.error);
          }
      }
  },
};
</script>
<style scoped>
.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: 100%; */
  height: 100vh;
  /* height: 288px; */
  position: relative;
  background-color: #1110;

  /* background-color: #111; */
}
/* .qrcode-stream-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 82px;
  clear: both;
} */
/* .qrcode-stream-wrapper >>> .qrcode-stream-camera {
  width: 213px;
  height: 210px;
  clear: both;
  margin-top: 39px;
} */
.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 .txt {
  width: 100%;
  height: 35px;
  line-height: 35px;
  font-size: 14px;
  text-align: center;
  /* color: #f9f9f9; */
  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);
  }
}

2、在使用的模块新建scan-code.vue应用qrcode组件，代码如下

<template>
    <div class="g-content">
        <qrcode @success="scanResult"></qrcode >
    </div>
</template>

<script>
    import qrcode from '@/components/qrcode/qrcode.vue';
    
    export default {
        name: 'scan',
        components:{
            qrcode
        },
        data(){
            return{
                
            }
        },
        created() {

        },
        methods : {
            scanResult(text) {
                // 成功回调，具体业务自己实现
                this.$store.commit('setScanResult', text);
                this.$router.go(-1);
            }
        }
    }
</script>

<style lang="less" scoped>
</style>