如何使用空格键捕获摄像头图像？我用的是ngx摄像头和angular 9

import { Component, OnInit } from '@angular/core';
import { CameraService } from 'ngx-camera';

constructor(private cameraService: CameraService) { }

ngOnInit() {
  document.addEventListener('keydown', (event) => {
    if (event.code === 'Space') {
      this.captureImage();
    }
  });
}

captureImage() {
  this.cameraService.capture().subscribe((imageData) => {
    // 在这里处理捕获到的图像数据
    console.log(imageData);
  });
}

<ngx-camera></ngx-camera>