H5扫描二维码（不需要任何插件）

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前言

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提示：以下是本篇文章正文内容，下面案例可供参考

一、H5扫码描述

描述：uniapp不支持H5扫描二维码，只能自己写方法。

二、使用步骤

1.页面

代码如下（示例）：

<template>
    <view class="scan size">
        <u-navbar back-text="二维码扫描"></u-navbar>
        <view class="sectionview"><view id="qr-reader" style="width:100%;height:100%;"></view></view>
    </view>
</template>

2.逻辑部分

代码如下（示例）：

<script>
export default {
    data() {
        return {
            cameraId: '',
        };
    },
    mounted() {
        this.init();
    },
    beforeDestroy() {//页面销毁时，关闭摄像头
        this.stop();
    },
    methods: {
        //返回结果
        getCode(id) {
            if (!id) return;
            //跳转页面
            uni.switchTab({
            	url:`/pages/menu/index`
            })
			uni.setStorageSync("id",id)
        },
        init() {
            this.AddJs('https://blog.minhazav.dev/assets/research/html5qrcode/html5-qrcode.min.js');
            //需要加载时间建议延时一点再获取设备列表
            setTimeout(() => {
                this.getCameras();
            }, 1000);
        },
        stop() {
            this.html5QrCode
                .stop()
                .then(ignore => {
                    // QR Code scanning is stopped.
                    console.log('QR Code scanning stopped.');
                })
                .catch(err => {
                    // Stop failed, handle it.
                    console.log('Unable to stop scanning.');
                });
        },
        start() {
            this.html5QrCode = new Html5Qrcode('qr-reader');
            this.html5QrCode
                .start(
                    this.cameraId, // retreived in the previous step.
                    {
                        fps: 10, // sets the framerate to 10 frame per second
                        qrbox: 250 // sets only 250 X 250 region of viewfinder to
                        // scannable, rest shaded.
                    },
                    qrCodeMessage => {
                        // do something when code is read. For example:
                        if (qrCodeMessage) {
                            uni.showToast({
                            	title: '扫码成功',
                            	icon: 'success'
                            });
                            this.getCode(qrCodeMessage);
                            this.stop();
							
                        }
                    },
                    errorMessage => {
                        // parse error, ideally ignore it. For example:
                        // console.log(`QR Code no longer in front of camera.`);
                    }
                )
                .catch(err => {
                    // Start failed, handle it. For example,
                    console.log(`Unable to start scanning, error: ${err}`);
                    this.$refs.uToast.show({
                        title: `扫码失败：${err}`,
                        type: 'error'
                    });
                });
        },
        getCameras() {
            Html5Qrcode.getCameras()
                .then(devices => {
                    /**
                     * devices would be an array of objects of type:
                     * { id: "id", label: "label" }
                     */
                    if (devices && devices.length) {
                        if (devices.length > 1) {
                            this.cameraId = devices[1].id;
                        } else {
                            this.cameraId = devices[0].id;
                        }
                        this.start();
                    }
                })
                .catch(err => {
                    this.$refs.uToast.show({
                        title: '启用相机失败',
                        type: 'error'
                    });
                });
        },
        //动态创建script的方法
        AddJs(url) {
            //console.log( 'url：',url);
            return new Promise((resolve, reject) => {
                const script = document.createElement('script');
                script.src = url;
                script.type = 'text/javascript';
                document.body.appendChild(script);
                script.onload = () => {
                    resolve();
                };
            });
        }
    }
};
</script>
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# 总结
提示：H5扫描二维码
我也看了很多方法，很多都是需要引入插件特别麻烦，这个直接可以使用。