如何简单实现相机关闭

private stopCamera() { 
  this.mCaptureSession?.stop(); 
  this.mCameraInput?.close(); 
  this.mPreviewOutput?.release(); 
  this.photoOutput?.release(); 
  if (this.mCaptureSession) { 
    this.mCaptureSession.release(); 
    this.mCaptureSession = undefined; 
  } 
}