vscode用vue2调用相机拍摄

要在Vue2中调用相机拍摄，你需要使用HTML5的`getUserMedia()` API。以下是一个简单的Vue2组件示例，可以使用此API来获取用户的媒体设备并捕获相机视频流：

<template>
  <div>
    <video ref="video" autoplay></video>
    <canvas ref="canvas"></canvas>
    <button @click="capture">Capture</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      video: null,
      canvas: null,
      stream: null
    };
  },
  mounted() {
    this.video = this.$refs.video;
    this.canvas = this.$refs.canvas;
    navigator.mediaDevices.getUserMedia({ video: true }).then(stream => {
      this.video.srcObject = stream;
      this.stream = stream;
    });
  },
  methods: {
    capture() {
      const context = this.canvas.getContext('2d');
      context.drawImage(this.video, 0, 0, this.canvas.width, this.canvas.height);
      const dataURL = this.canvas.toDataURL();
      console.log(dataURL); // do something with the captured image
    }
  },
  beforeDestroy() {
    if (this.stream) {
      this.stream.getTracks().forEach(track => track.stop());
    }
  }
};
</script>

该组件首先在`mounted()`生命周期钩子中获取用户的相机视频流，并将其分配给`<video>`元素的`srcObject`属性。然后，当用户单击“Capture”按钮时，`capture()`方法将在`<canvas>`元素中绘制视频帧并将其转换为数据URL。你可以将数据URL用作图像源，或将其发送到服务器以进行进一步处理。最后，在组件销毁之前，我们使用`beforeDestroy()`生命周期钩子停止相机流。