Vue 调用摄像头扫描条码功能实现代码

npm install jsqr

<template>
  <div class="scanner-container">
    <h2>条码扫描</h2>
    <video ref="video" autoplay playsinline></video>
    <canvas ref="canvas" style="display: none;"></canvas>
    <p v-if="barcode">扫描结果: {{ barcode }}</p>
    <button @click="startScanner" :disabled="isScanning">开始扫描</button>
    <button @click="stopScanner" :disabled="!isScanning">停止扫描</button>
  </div>
</template>
<script>
import jsQR from "jsqr";
export default {
  data() {
    return {
      isScanning: false,
      barcode: null,
      videoStream: null,
    };
  },
  methods: {
    async startScanner() {
      try {
        // 请求访问摄像头
        this.videoStream = await navigator.mediaDevices.getUserMedia({
          video: { facingMode: "environment" }, // 使用后置摄像头
        });
        this.$refs.video.srcObject = this.videoStream;
        // 等待视频元数据加载完成
        await new Promise((resolve) => {
          this.$refs.video.onloadedmetadata = resolve;
        });
        this.isScanning = true;
        this.scanBarcode(); // 开始扫描
      } catch (error) {
        console.error("无法访问摄像头:", error);
        alert("无法访问摄像头，请检查权限设置！");
      }
    },
    stopScanner() {
      if (this.videoStream) {
        const tracks = this.videoStream.getTracks();
        tracks.forEach((track) => track.stop());
        this.videoStream = null;
        this.isScanning = false;
      }
    },
    scanBarcode() {
      if (!this.isScanning) return;
      const video = this.$refs.video;
      const canvas = this.$refs.canvas;
      const context = canvas.getContext("2d", { willReadFrequently: true }); // 添加此选项
      // 设置 canvas 尺寸与视频一致
      canvas.width = video.videoWidth;
      canvas.height = video.videoHeight;
      // 绘制视频帧到 canvas
      context.drawImage(video, 0, 0, canvas.width, canvas.height);
      // 获取图像数据
      const imageData = context.getImageData(0, 0, canvas.width, canvas.height);
      // 使用 jsQR 解析条码
      const code = jsQR(imageData.data, imageData.width, imageData.height);
      if (code) {
        this.barcode = code.data; // 保存扫描结果
        this.stopScanner(); // 停止扫描
      } else {
        // 继续扫描下一帧
        requestAnimationFrame(this.scanBarcode);
      }
    },
  },
  beforeDestroy() {
    this.stopScanner(); // 离开页面时停止摄像头
  },
};
</script>
<style scoped>
.scanner-container {
  text-align: center;
  margin-top: 20px;
}
video {
  width: 100%;
  max-width: 400px;
  margin: 20px auto;
  border: 1px solid #ccc;
}
button {
  margin: 10px;
  padding: 10px 20px;
  font-size: 16px;
  cursor: pointer;
}
</style>