uniapp在h5页面实现扫码功能(html5-qrcode)

安装
npm install html5-qrcode
代码

<template>
    <view class="container">
        <button class="scan" @click="scanCode">打开相机扫码</button>
        <view class="reader-box" v-if="isScaning">
            <view class="reader" id="reader"></view>
        </view>
    </view>
</template>
<script>
    import {
        Html5Qrcode
    } from 'html5-qrcode';
    export default {
        data() {
            return {
                html5Qrcode: null,
                isScaning: false,
            }
        },
        methods: {
            startScan() {
                this.isScaning = true;
                Html5Qrcode.getCameras().then(devices => {
                    if (devices && devices.length) {
                        this.html5Qrcode = new Html5Qrcode('reader');
                        this.html5Qrcode.start({
                            facingMode: 'environment',
                        }, {
                            fps: 24,
                            qrbox: 280
                        }, (decodeText, decodeResult) => {
                            console.log(decodeText)
                            if (decodeText) {
                                this.stopScan();
                                this.isScaning = false;
                            }
                        }, (err) => {
                            console.log(err)
                        });
                    }
                });
            },
            stopScan() {
                this.html5Qrcode.stop();
            },
            scanCode() {
                console.log('helo')
                this.startScan();
            }
        }
    }
</script>
<style scoped>
    .container{
        height:100%;
    }
    .reader-box {
        position: fixed;
        top: 0;
        bottom: 0;
        left: 0;
        right: 0;
        background-color: rgba(0, 0, 0, 0.5);
    }
    .reader {
        width: 540rpx;
        height: 540rpx;
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
    }
</style>

测试效果
uniapp运行到浏览器