举个例子，比如拍一张有三瓶矿泉水的照片，白天和晚上光线不同，整张图片的色温、亮度都变了，模型可能就不认识了。
const cur = nums2[i];
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const cur = Number(num[i]); // 转数字方便比较（也可直接比较字符）