需求：vue项目要求要在浏览器中调用摄像头进行扫一扫，并识别出二维码的字符串 插件：QRCodeReader 插件下载 npm install --save vue-qrcode-reader 注意： 需要在https协议下才可以调用相机，实现扫码。 可以通过配置vue.config.js中的devServer:{https:true}   场景：点击扫一扫的图标，触发扫一扫功能，自动识别出数据之后，enter回车键触发接口请求 在需要用到这个组件的父页面 template(vue, elementui, pug格式)

    el-input(placeholder="手机号/订单号" v-model="result" class="preview-input" @keyup.enter.native="getOrderinfo()")
      i(slot="suffix" class="el-icon-full-screen" @click="clickCode()")
      img(slot="prefix" src="@/assets/img/search.svg" class="input-img" @click="getOrderinfo()")
    div(class="notes") 
    BarScan(v-bind:scancode="scancode" v-if="scancode" @ok="getResult" )

 

引入子组件

import BarScan from '../../components/common/scan.vue';

使用到的data

  data: () => ({
    scancode:false,//控制是否使用扫一扫功能
     result: '',//扫码结果信息
  }),

组件注册

 components: { BarScan },

该页面触发到的方法

methods: {
    // 打开相机
    clickCode() {
   this.scancode=true;
    },
    //返回扫描结果并关闭摄像头
    getResult(result){
      this.result=result;
         if(result!==""){
                  this.scancode=false;
               
                }
    },
    //识别完文本之后，enter触发接口请求
    getOrderinfo() 
    }
  },

扫一扫组件页面 scan.vue

<template>
  <div class="scan" v-if="scancode">
    <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>
// 下载插件
// cnpm install --save  vue-qrcode-reader
// 引入
import { QrcodeStream } from 'vue-qrcode-reader'
export default {
  // 注册
  components: { QrcodeStream },
props: {
    scancode: {
      type: Boolean,
      default: false,
    }
},
  data() {
    return {
      result: '', // 扫码结果信息
      error: '' // 错误信息
    }
  },
created(){
    this.clickCode()
},
  methods: {
          clickCode() {
   this.scancode=true;
    },
//回调扫描结果
    onDecode (result) {
              
                if(result!==""){
                  this.scancode=false;
                  this.$emit("ok",result)
                }
               
            },
// 检查是否调用摄像头   
            async onInit (promise) {
                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"
                    }
                }
            },
  }
}
</script>
<style scoped>
.error {
  font-weight: bold;
  color: red;
}
</style>
<style scoped>
  @import '../../assets/css/scancode.scss';
</style>

 

引入的css scancode.scss

.scan{
    width: 100vw;
    border-color: #585858;
    position: fixed;
    top: 0;
    left: 0;
}
.qrcode-stream-camera{
    width: 100%;
    height: 100%;
    display: block;
    -o-object-fit: cover;
    object-fit: cover;
    position: absolute;
    top: 0%;
    left: 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);
      }
    }