看看:

产品->库存->购物车中允许的最大数量

Product -> Inventory -> Maximum Qty Allowed in Shopping Cart

系统->配置->库存->购物车中允许的最大数量

System -> Configuration -> Inventory -> Maximum Qty Allowed in Shopping Cart

请查看使用事件/观察器自定义Magento .

您可以使用的事件例如:checkout_cart_update_items_before和checkout_cart_product_add_after

Events you could use, are for example: checkout_cart_update_items_before and checkout_cart_product_add_after

我也建议您查看:/app/code/core/Mage/Checkout/Model/Cart.php可能有帮助的其他事件.

Also I'd suggest looking atthe: /app/code/core/Mage/Checkout/Model/Cart.php for other events that might be helpful.

在此文件中，您还将找到类似以下的代码:

In this file also, you'll find code like:

$this->getCheckoutSession()->addError(
  Mage::helper('checkout')->__('Some of the requested products are unavailable.')
);

您可以用来向客户显示错误消息.

Which you could use for displaying the the error message to the customer.