Your model must provide some notification mechanism, and this mechanism must be mapped to the appropriate updates in your application.
您的模型必须提供某种通知机制，该机制必须映射到您应用程序中相应的更新。
Alerts provide notification that new code is available, and updates are installed with a click of the mouse.
警报会发出新代码已可用的通知，只需单击鼠标就能安装更新。
Click on the notification and it will launch the Extension Manager to install new updates.
点击通知，它就会载入扩展管理器来安装新的更新。
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