Record a data verification point using the Visible Text option to make sure that the shopping cart icon at the top of the screen is updated to reflect the item in your cart.
使用可见文本选项记录数据验证点来确保画面顶部的购物车图标已按照你购物车内的货物进行了更新。
The example application stores the type of the screen to display as a render parameter, and the content of the shopping cart (the number of stocks) as a session parameter.
该示例应用程序将要显示的屏幕类型作为呈现参数存储，将购物车的内容(股票的数量)作为会话参数存储。
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