In order to have behavior tied to property values, you need to be notified when the property value changes.
为了使行为与属性值相关联，您需要在属性值更改时得到通知。
Page developers who use the component can bind the property notification event to their own handler to run code when the property value changes.
使用元件的网页开发人员可以将属性通知事件系结至自己的处理常式，每当属性值变更时就执行程式码。
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