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('正在运运双')
    router.push('order')
}
onUnmounted(() => {
    stop()
})
const getCameras = () => {
    Html5Qrcode.getCameras()
        .then((devices) => {
            if (devices && devices.length) {
                isShow.value = true
                html5QrCode = new Html5Qrcode('reader')
                // start入手下手扫描
                start()
            }
        })
        .catch((err) => {
            // handle err
            console.log('猎取摆设疑息失落败', err) // 猎取摆设疑息掉败
            showToast('猎取设置疑息掉败')
        })
}
const start = () => {
    html5QrCode
        .start(
            {facingMode: "environment" },
            {
                fps: 二0, // 设施每一秒几多帧
                qrbox: { width: 两50, height: 两50 } // 摆设与景范畴
                // scannable, rest shaded.
            },
            (decodedText, decodedResult) => {
            	alert('扫码功效' + decodedText)
            },
            (errorMessage) => {
                // parse error, ideally ignore it. For example:
                // console.log(`QR Code no longer in front of camera.`);
                console.log('久无额扫描成果', 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>