用例中读取的数据应该用来向用户显示购物车。
The data read in the use case should be used to display the cart to the user.
如果不论什么原因，需要读取的数据不能合理地显示在视图上，那么您需要处理后端文档，从而可以直接访问它们的NotesItems。
If you need to read data which cannot, for whatever reason, be reasonably displayed in a view, then you need to get a handle to the back-end documents so that you can access their NotesItems directly.
下例显示单个静态属性：$iodir，存放用于保存和读取 Dictionary 数据的默认目录的路径。
This example shows a single static property: $iodir, which holds the path to the default directory for saving and reading Dictionary data.
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