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比如说，我想写一个 if 判断句，判断条件是当前相机传感器的像素是VGA还是QQVGA。该如何写呢？ （目前涉及到VGA的，只知道一句：sensor.set_framesize(sensor.VGA) ）
img.width() img.height()
if(img.width() == 320 & img.height() == 240)的意思就是判断当前framesize是否是QVGA吗？