使用html5-qrcode

npm 地址

1.安装

npm i html5-qrcode

2.使用

<template>
  <div class="container">
    <div id="reader"></div>
  </div>
</template>

<script setup lang="ts">
import { onMounted, ref } from 'vue';
import { useRouter } from 'vue-router';
import { Html5Qrcode } from 'html5-qrcode';
import { Html5QrcodeResult, CameraDevice } from './interface';

let cameraId = ref('');
let devicesInfo = ref<any>('');
let html5QrCode = ref<any>(null);
const router = useRouter();

onMounted(() => {
  getCameras();
});

onUnmounted(() => {
  stop();
});

const getCameras = () => {
  Html5Qrcode.getCameras()
    .then((devices: CameraDevice[]) => {
      console.log('摄像头信息', devices);
      if (devices && devices.length) {
        // 如果有2个摄像头，1为前置的
        if (devices.length > 1) {
          cameraId.value = devices[1].id;
        } else {
          cameraId.value = devices[0].id;
        }
        devicesInfo.value = devices;
        // 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
    });
};
const start = () => {
  html5QrCode = new Html5Qrcode('reader');
  html5QrCode
    .start(
      cameraId.value, // retreived in the previous step.
      {
        fps: 10, // 设置每秒多少帧
        qrbox: { width: 250, height: 250 }, // 设置取景范围
        // scannable, rest shaded.
      },
      (decodedText: string, decodedResult: Html5QrcodeResult) => {
        // do something when code is read. For example:
        // if (qrCodeMessage) {
        //   getCode(qrCodeMessage);
        //   stop();
        // }
        console.log('扫描的结果', decodedText, decodedResult);
        // if (decodedText) {
        //   router.push('order');
        // }
      },
      (errorMessage: any) => {
        // 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: any) => {
      // Start failed, handle it. For example,
      console.log(`Unable to start scanning, error: ${err}`);
    });
};
const stop = () => {
  html5QrCode
    .stop()
    .then((ignore: any) => {
      // QR Code scanning is stopped.
      console.log('QR Code scanning stopped.', ignore);
    })
    .catch((err: any) => {
      // Stop failed, handle it.
      console.log('Unable to stop scanning.', err);
    });
};
</script>

<style lang="scss" scoped>
.container {
	position: relative;
	height: 100%;
	width: 100%;
  	background: rgba($color: #000000, $alpha: 0.48);
}
#reader {
  top: 50%;
  left: 0;
  transform: translateY(-50%);
}
</style>

3.类型

export interface CameraDevice {
  id: string;
  label: string;
}

/**
 * Code formats supported by this library.
 */
enum Html5QrcodeSupportedFormats {
  QR_CODE = 0,
  AZTEC,
  CODABAR,
  CODE_39,
  CODE_93,
  CODE_128,
  DATA_MATRIX,
  MAXICODE,
  ITF,
  EAN_13,
  EAN_8,
  PDF_417,
  RSS_14,
  RSS_EXPANDED,
  UPC_A,
  UPC_E,
  UPC_EAN_EXTENSION,
}

class QrcodeResultFormat {
  // @ts-ignore
  public readonly format: Html5QrcodeSupportedFormats;
  // @ts-ignore
  public readonly formatName: string;
}

/** Detailed scan result. */
export interface QrcodeResult {
  /** Decoded text. */
  text: string;

  /** Format that was successfully scanned. */
  format?: QrcodeResultFormat;
}

/** QrCode result object. */
export interface Html5QrcodeResult {
  decodedText: string;
  result: QrcodeResult;
}