当放弃变更时，仍可以保持程序完整。而且，测试用例失败或变更引发错误时，自动化构建会通知您。
You fully integrate when you drop changes, and the automated build notifies you when a test case fails or a change induces errors.
每个组件视图必须有一个注册处理程序，以接收属性变更通知。
Every component view must have a registered handler to receive notifications of property changes.
原始数据提供程序不能满足经常改变的数据的需求，因为组件不能收到数据变更通知。
Raw data providers are not sufficient for data that is always changing, because the components do not receive notification of data changes.
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