我们可以访问 https://www.wwei.cn/?from=bdtp
在输入框中输入文本 然后 点击生成二维码

他就会给我生成一个对应信息的二维码图片 我们可以复制到本地

打开vue项目
先引入依赖

npm install canvas jsqr

然后组件编写代码如下

<template>
  <div>
    <input type="file" accept="image/*" @change="onFileChange">
    <canvas class = "canvas" ref="canvas"></canvas>
    {{ com }}
  </div>
</template>

<script>
import jsQR from 'jsqr'

export default {
  name: 'ScanQRCode',
  data(){
    return {
        com: ""
    }
  },
  methods: {
    async onFileChange(e) {
      const file = event.target.files[0]
      const reader = new FileReader()
      reader.onload = () => {
        const img = new Image()
        img.onload = () => {
          const canvas = this.$refs.canvas;
          const context = canvas.getContext('2d')
          context.drawImage(img, 0, 0, canvas.width, canvas.height)
          const imageData = context.getImageData(0, 0, canvas.width, canvas.height)
          const code = jsQR(imageData.data, imageData.width, imageData.height)
          if (code) {
            this.com = code.data;
          } else {
            this.com = "无法识别";
          }
        }
        img.src = reader.result;
      }
      reader.readAsDataURL(file);
    },
    parseQrCode(imageUrl) {
        return new Promise((resolve, reject) => {
            const qr = new QrCode();
            const img = new Image();
            img.onload = () => {
                qr.callback = (err, result) => {
                    if (err) {
                        debugger
                        reject(err);
                    } else {
                        resolve(result);
                    }
                };
                qr.decode(img);
            };
            img.src = imageUrl;
        });
    }
  },
  mounted() {
    if (navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {
        navigator.mediaDevices.getUserMedia({ video: true }).then((stream) => {
        const video = document.createElement('video');
        video.srcObject = stream;
        video.play();
        const canvas = this.$refs.canvas;
        const ctx = canvas.getContext('2d');
        const qr = new QrCode();
        const scan = () => {
            if (video.paused || video.ended || video.readyState < 2) {
            setTimeout(scan, 100);
            return;
            }
            canvas.width = video.videoWidth;
            canvas.height = video.videoHeight;
            ctx.drawImage(video, 0, 0);
            try {
            qr.decode(canvas.toDataURL());
            } catch (err) {}
            setTimeout(scan, 100);
        };
        scan();
        });
    }
  }
}
</script>

<style scoped>
.canvas{
    display: none;
}
</style>

然后 我们打开PC端网页访问 点击 选择文件
他就会让我在文件夹中选择 我们选一个二维码

我们定制的内容也是被识别了出来

当我用手机 点击选择文件

他会问我们拍照还是从相册中去找
我们点击拍照
用相机把二维码拍给他 注意 一定要清晰一点 不然识别不出来

这样 我们的二维码也是成功在手机端也识别了出来