vue3实现扫码识别（二维码&条形码）_vue3 扫码

1.安装@zxing/library

npm i @zxing/library

2.页面引入

import { BrowserMultiFormatReader } from '@zxing/library';

3.实现步骤

 3.1 显示摄像头的部分

<div class='AboutView'>
    <!-- 镜头区域 -->
    <video ref="video" id="video" class="scan-video" autoplay></video>
    
    <div class="but_box">
      <div> <span>机器编号：</span><input type="text" v-model="number"></div>
      <div> <span>料 号：</span><input type="text" v-model="scanText"></div>
      <div><button @click="openScan">扫码</button><button @click="postScanData">提交</button></div>    
    </div>
    
  </div>

3.2 js代码

const codeReader = ref(null);
 
const scanText = ref('')
const number = ref('')
// 初始化相机
const openScan = ()=>{
  codeReader.value = new BrowserMultiFormatReader()
  codeReader.value.getVideoInputDevices().then(videoDevices=>{
    let firstDeviceId = videoDevices[videoDevices.length - 1].deviceId;
    if (videoDevices.length > 1) {
            // 一般通过判断摄像头列表项里的 label 字段，'camera2 0, facing back' 字符串含有 'back' 和 '0'，大部分机型是这样，如果有些机型没有，那就还是默认获取最后一个
      firstDeviceId = videoDevices.find(el => { return el.label.indexOf('back') > -1 && el.label.indexOf('0') > -1 }) ? 
      videoDevices.find(el => { return el.label.indexOf('back') > -1 && el.label.indexOf('0') > -1 }).deviceId : 
      videoDevices[videoDevices.length - 1].deviceId;
      }
      decodeFromInputVideoFunc(firstDeviceId);
  }).catch(err=>{
    console.log(err);
  })
}
// 扫码
const decodeFromInputVideoFunc = (firstDeviceId)=> {  // 使用摄像头扫描
 
        codeReader.value.reset(); // 重置
        codeReader.value.decodeFromInputVideoDeviceContinuously(firstDeviceId, 'video', (result, err) => {  
          if (result) {
            alert(result.text)
            console.log('扫码结果', result);
            scanText.value = result.text;
            if (scanText.value) {
              // 识别成功关闭摄像头
              codeReader.value.reset()
              codeReader.value.stopContinuousDecodeFromInputVideoDevice()
            }
          }
        });
  }

4.完整代码

<template>
  <div class='AboutView'>
    <!-- 镜头区域 -->
    <video ref="video" id="video" class="scan-video" autoplay></video>
    
    <div class="but_box">
      <div> <span>机器编号：</span><input type="text" v-model="number"></div>
      <div> <span>料 号：</span><input type="text" v-model="scanText"></div>
      <div><button @click="openScan">扫码</button><button @click="postScanData">提交</button></div>    
    </div>
    
  </div>
</template>
 
<script setup>
import { onMounted, ref } from 'vue'
 
import { BrowserMultiFormatReader } from '@zxing/library';
// import axios from 'axios'
import { transferData } from '../server/common'
const codeReader = ref(null);
 
const scanText = ref('')
const number = ref('')
// 初始化相机
const openScan = ()=>{
  codeReader.value = new BrowserMultiFormatReader()
  codeReader.value.getVideoInputDevices().then(videoDevices=>{
    let firstDeviceId = videoDevices[videoDevices.length - 1].deviceId;
    if (videoDevices.length > 1) {
            // 一般通过判断摄像头列表项里的 label 字段，'camera2 0, facing back' 字符串含有 'back' 和 '0'，大部分机型是这样，如果有些机型没有，那就还是默认获取最后一个
      firstDeviceId = videoDevices.find(el => { return el.label.indexOf('back') > -1 && el.label.indexOf('0') > -1 }) ? 
      videoDevices.find(el => { return el.label.indexOf('back') > -1 && el.label.indexOf('0') > -1 }).deviceId : 
      videoDevices[videoDevices.length - 1].deviceId;
      }
      decodeFromInputVideoFunc(firstDeviceId);
  }).catch(err=>{
    console.log(err);
  })
}
// 扫码
const decodeFromInputVideoFunc = (firstDeviceId)=> {  // 使用摄像头扫描
 
        codeReader.value.reset(); // 重置
        codeReader.value.decodeFromInputVideoDeviceContinuously(firstDeviceId, 'video', (result, err) => {  
          if (result) {
            alert(result.text)
            console.log('扫码结果', result);
            scanText.value = result.text;
            if (scanText.value) {
              // 识别成功关闭摄像头
              codeReader.value.reset()
              codeReader.value.stopContinuousDecodeFromInputVideoDevice()
            }
          }
        });
  }
 
  // 提交扫码结果
  const postScanData = ()=>{
    const scanData = {
      partno:scanText.value,
      deviceid:Number(number.value),  
    }
    transferData(scanData).then(res=>{
      alert(res)
    })
  }
 
onMounted(()=>{
  
  
})
</script>
 
<style scoped lang='scss'>
.AboutView {
}
video{
  margin-top: 20%;
    width: 80%;
}
.but_box{
  position: fixed;
  bottom: 10%;
  left: 50%;
  transform: translateX(-50%);
  div{
    display: flex;
    margin: 0.125rem 0;
    justify-content: space-around;
    span{
      width: 5.625rem;
      text-align: right;
    }
    input{
      text-align: center;
    }
    button{
      width: 8.4375rem;
      height: 2.75rem;
      font-size: 1.5625rem;
      font-weight: 600;
      color: lavenderblush;
      background-color: rgba(0, 183, 255,0.8);
      border: none;
      border-radius: 0.5rem;
    }
  } 
}
</style>

5.效果图

6.注意：调用浏览器摄像头需要在https环境下运行