html5项目实现扫描二维码功能

npm i html5-qrcode

<template>     <div class="container" v-show="isShow">       <div id="reader"></div>     </div> </template> <script setup> import { reactive, onMounted, onUnmounted, ref } from 'vue' import { showToast  } from 'vant'; import { Html5Qrcode } from 'html5-qrcode' let html5QrCode = ref(null) onMounted(() => {   getCameras() }) const onSearchOrder = () => {     console.log('在运运单')     router.push('order') } onUnmounted(() => {     stop() }) const getCameras = () => {     Html5Qrcode.getCameras()         .then((devices) => {             if (devices && devices.length) {                 isShow.value = true                 html5QrCode = new Html5Qrcode('reader')                 // start开始扫描                 start()             }         })         .catch((err) => {             // handle err             console.log('获取设备信息失败', err) // 获取设备信息失败             showToast('获取设备信息失败')         }) } const start = () => {     html5QrCode         .start(             {facingMode: "environment" },             {                 fps: 20, // 设置每秒多少帧                 qrbox: { width: 250, height: 250 } // 设置取景范围                 // scannable, rest shaded.             },             (decodedText, decodedResult) => {             	alert('扫码结果' + decodedText)             },             (errorMessage) => {                 // parse error, ideally ignore it. For example:                 // console.log(`QR Code no longer in front of camera.`);                 console.log('暂无额扫描结果', errorMessage)             }         )         .catch((err) => {             // Start failed, handle it. For example,             console.log(`Unable to start scanning, error: ${err}`)         }) } const stop = () => {     if (devicesInfo.value) {         html5QrCode             .stop()             .then((ignore) => {                 // QR Code scanning is stopped.                 console.log('QR Code scanning stopped.', ignore)             })             .catch((err) => {                 // Stop failed, handle it.                 console.log('Unable to stop scanning.', err)             })     } } </script> <style lang="scss" scoped> .container {     position: relative;     top: 0px;     left: 0px;     height: 100vh;     width: 100%;     background: rgba($color: #000000, $alpha: 0.48);     z-index: 999; } #reader {     top: 50%;     left: 0;     transform: translateY(-50%); } </style>