爸爸带我去超市买东西,我发现所有商品的包装上都有黑色条纹。哦,你是说黑色条形码是吧!黑色条形码?它有什么作用呢?黑色的商品条码是商品进入超级市场的入场券。当顾客买好商品在收银台前付款时,收银员只要拿着带有条码的商品在装有激光扫描器的台上轻轻掠过,就把条码下方的数 Dad took me to the supermarket to buy things, I found all the packaging of goods have black stripes. Oh, you mean black bar code is it! Black bar code? What does it do? Black bar code is the entry of goods into the supermarket. When a customer buys a product and pays before the checkout counter, the cashier simply passes the product with the bar code on the stage with the laser scanner, puts the number under the bar code