当用户点击了一个商品，面板内容就会根据 panelGrid 更新，与 product.jsp 文件中定义的相似（href 属性）。
When the user clicks on a product, the content of the panel is updated with a panelGrid similar to that defined in the product.jsp file (the href attribute).
购物车仅当用户点击按钮时才会更新，而用户不得不转入其他页面以浏览产品的详细描述。
The cart is updated only when the user clicks a button, and the user has to navigate to another page to see a detailed description of an item.
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